You've already forked UnrealEngineUWP
mirror of
https://github.com/izzy2lost/UnrealEngineUWP.git
synced 2026-03-26 18:15:20 -07:00
1601 lines
36 KiB
C++
1601 lines
36 KiB
C++
// Copyright (C) 2009 Nine Realms, Inc
|
|
//
|
|
|
|
#pragma once
|
|
|
|
#include "CoreMinimal.h"
|
|
|
|
#define SIMP_CACHE 1
|
|
|
|
#include "MeshSimplifyElements.h"
|
|
#include "Quadric.h"
|
|
#include "Containers/HashTable.h"
|
|
#include "Containers/BinaryHeap.h"
|
|
//#include "Cache.h"
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
class TMeshSimplifier
|
|
{
|
|
typedef typename TSimpVert<T>::TriIterator TriIterator;
|
|
typedef TQuadricAttr< NumAttributes > QuadricType;
|
|
|
|
public:
|
|
TMeshSimplifier( const T* Verts, uint32 NumVerts, const uint32* Indexes, uint32 NumIndexes );
|
|
~TMeshSimplifier();
|
|
|
|
void SetAttributeWeights( const float* weights );
|
|
void SetBoundaryLocked();
|
|
|
|
void InitCosts();
|
|
|
|
float SimplifyMesh( float maxErrorLimit, int minTris, int minVerts = INT_MAX);
|
|
|
|
int GetNumVerts() const { return numVerts; }
|
|
int GetNumTris() const { return numTris; }
|
|
|
|
void OutputMesh( T* Verts, uint32* Indexes );
|
|
|
|
protected:
|
|
void LockVertFlags( uint32 flag );
|
|
void UnlockVertFlags( uint32 flag );
|
|
|
|
void LockTriFlags( uint32 flag );
|
|
void UnlockTriFlags( uint32 flag );
|
|
|
|
void GatherUpdates( TSimpVert<T>* v );
|
|
|
|
void GroupVerts();
|
|
void GroupEdges();
|
|
|
|
void InitVert( TSimpVert<T>* v );
|
|
|
|
QuadricType GetQuadric( TSimpVert<T>* v );
|
|
FQuadric GetEdgeQuadric( TSimpVert<T>* v );
|
|
|
|
// TODO move away from pointers and remove these functions
|
|
uint32 GetVertIndex( const TSimpVert<T>* vert ) const;
|
|
uint32 GetTriIndex( const TSimpTri<T>* tri ) const;
|
|
uint32 GetEdgeIndex( const TSimpEdge<T>* edge ) const;
|
|
|
|
uint32 HashPoint( const FVector& p ) const;
|
|
uint32 HashEdge( const TSimpVert<T>* u, const TSimpVert<T>* v ) const;
|
|
TSimpEdge<T>* FindEdge( const TSimpVert<T>* u, const TSimpVert<T>* v );
|
|
|
|
void RemoveEdge( TSimpEdge<T>* edge );
|
|
void ReplaceEdgeVert( const TSimpVert<T>* oldV, const TSimpVert<T>* otherV, TSimpVert<T>* newV );
|
|
void CollapseEdgeVert( const TSimpVert<T>* oldV, const TSimpVert<T>* otherV, TSimpVert<T>* newV );
|
|
|
|
float ComputeNewVerts( TSimpEdge<T>* edge, TArray< T, TInlineAllocator<16> >& newVerts );
|
|
float ComputeEdgeCollapseCost( TSimpEdge<T>* edge );
|
|
void Collapse( TSimpEdge<T>* edge );
|
|
|
|
void UpdateTris();
|
|
void UpdateVerts();
|
|
void UpdateEdges();
|
|
|
|
uint32 vertFlagLock;
|
|
uint32 triFlagLock;
|
|
|
|
float attributeWeights[ NumAttributes ];
|
|
|
|
TSimpVert<T>* sVerts;
|
|
TSimpTri<T>* sTris;
|
|
|
|
int numSVerts;
|
|
int numSTris;
|
|
|
|
int numVerts;
|
|
int numTris;
|
|
|
|
TArray< TSimpEdge<T> > edges;
|
|
FHashTable edgeHash;
|
|
FBinaryHeap<float> edgeHeap;
|
|
|
|
TArray< TSimpVert<T>* > updateVerts;
|
|
TArray< TSimpTri<T>* > updateTris;
|
|
TArray< TSimpEdge<T>* > updateEdges;
|
|
|
|
#if SIMP_CACHE
|
|
TBitArray<> VertQuadricsValid;
|
|
TArray< QuadricType > VertQuadrics;
|
|
|
|
TBitArray<> TriQuadricsValid;
|
|
TArray< QuadricType > TriQuadrics;
|
|
|
|
TBitArray<> EdgeQuadricsValid;
|
|
TArray< FQuadric > EdgeQuadrics;
|
|
#endif
|
|
};
|
|
|
|
|
|
//=============
|
|
// TMeshSimplifier
|
|
//=============
|
|
template< typename T, uint32 NumAttributes >
|
|
TMeshSimplifier<T, NumAttributes>::TMeshSimplifier( const T* Verts, uint32 NumVerts, const uint32* Indexes, uint32 NumIndexes )
|
|
: edgeHash( 1 << FMath::Min( 16u, FMath::FloorLog2( NumVerts ) ) )
|
|
{
|
|
vertFlagLock = 0;
|
|
triFlagLock = 0;
|
|
|
|
for( uint32 i = 0; i < NumAttributes; i++ )
|
|
{
|
|
attributeWeights[i] = 1.0f;
|
|
}
|
|
|
|
numSVerts = NumVerts;
|
|
numSTris = NumIndexes / 3;
|
|
|
|
this->numVerts = numSVerts;
|
|
this->numTris = numSTris;
|
|
|
|
sVerts = new TSimpVert<T>[ numSVerts ];
|
|
sTris = new TSimpTri<T>[ numSTris ];
|
|
|
|
#if SIMP_CACHE
|
|
VertQuadricsValid.Init( false, numSVerts );
|
|
VertQuadrics.SetNum( numSVerts );
|
|
|
|
TriQuadricsValid.Init( false, numSTris );
|
|
TriQuadrics.SetNum( numSTris );
|
|
|
|
EdgeQuadricsValid.Init( false, numSVerts );
|
|
EdgeQuadrics.SetNum( numSVerts );
|
|
#endif
|
|
|
|
for( int i = 0; i < numSVerts; i++ )
|
|
{
|
|
sVerts[i].vert = Verts[i];
|
|
}
|
|
|
|
for( int i = 0; i < numSTris; i++ )
|
|
{
|
|
for( int j = 0; j < 3; j++ )
|
|
{
|
|
sTris[i].verts[j] = &sVerts[ Indexes[3*i+j] ];
|
|
sTris[i].verts[j]->adjTris.Add( &sTris[i] );
|
|
}
|
|
}
|
|
|
|
GroupVerts();
|
|
|
|
int maxEdgeSize = FMath::Min( 3 * numSTris, 3 * numSVerts - 6 );
|
|
edges.Empty( maxEdgeSize );
|
|
for( int i = 0; i < numSVerts; i++ )
|
|
{
|
|
InitVert( &sVerts[i] );
|
|
}
|
|
|
|
// Guessed wrong on num edges. Array was resized so fix up pointers.
|
|
if( edges.Num() > maxEdgeSize )
|
|
{
|
|
for( int i = 0; i < edges.Num(); i++ )
|
|
{
|
|
TSimpEdge<T>& edge = edges[i];
|
|
edge.next = &edge;
|
|
edge.prev = &edge;
|
|
}
|
|
}
|
|
|
|
GroupEdges();
|
|
|
|
edgeHash.Resize( edges.Num() );
|
|
for( int i = 0; i < edges.Num(); i++ )
|
|
{
|
|
edgeHash.Add( HashEdge( edges[i].v0, edges[i].v1 ), i );
|
|
}
|
|
|
|
edgeHeap.Resize( edges.Num(), edges.Num() );
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
TMeshSimplifier<T, NumAttributes>::~TMeshSimplifier()
|
|
{
|
|
delete[] sVerts;
|
|
delete[] sTris;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
void TMeshSimplifier<T, NumAttributes>::SetAttributeWeights( const float* weights )
|
|
{
|
|
for( uint32 i = 0; i < NumAttributes; i++ )
|
|
{
|
|
attributeWeights[i] = weights[i];
|
|
}
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
void TMeshSimplifier<T, NumAttributes>::SetBoundaryLocked()
|
|
{
|
|
TArray< TSimpVert<T>*, TInlineAllocator<64> > adjVerts;
|
|
|
|
for( int i = 0; i < numSVerts; i++ )
|
|
{
|
|
TSimpVert<T>* v0 = &sVerts[i];
|
|
check( v0->adjTris.Num() > 0 );
|
|
|
|
adjVerts.Reset();
|
|
v0->FindAdjacentVertsGroup( adjVerts );
|
|
|
|
for( TSimpVert<T>* v1 : adjVerts )
|
|
{
|
|
if( v0 < v1 )
|
|
{
|
|
LockTriFlags( SIMP_MARK1 );
|
|
|
|
// set if this edge is boundary
|
|
// find faces that share v0 and v1
|
|
v0->EnableAdjTriFlagsGroup( SIMP_MARK1 );
|
|
v1->DisableAdjTriFlagsGroup( SIMP_MARK1 );
|
|
|
|
int faceCount = 0;
|
|
TSimpVert<T>* vert = v0;
|
|
do
|
|
{
|
|
for( TriIterator j = vert->adjTris.Begin(); j != vert->adjTris.End(); ++j )
|
|
{
|
|
TSimpTri<T>* tri = *j;
|
|
faceCount += tri->TestFlags( SIMP_MARK1 ) ? 0 : 1;
|
|
}
|
|
vert = vert->next;
|
|
} while( vert != v0 );
|
|
|
|
v0->DisableAdjTriFlagsGroup( SIMP_MARK1 );
|
|
|
|
if( faceCount == 1 )
|
|
{
|
|
// only one face on this edge
|
|
v0->EnableFlagsGroup( SIMP_LOCKED );
|
|
v1->EnableFlagsGroup( SIMP_LOCKED );
|
|
}
|
|
|
|
UnlockTriFlags( SIMP_MARK1 );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// locking functions for nesting safety
|
|
template< typename T, uint32 NumAttributes >
|
|
FORCEINLINE void TMeshSimplifier<T, NumAttributes>::LockVertFlags( uint32 f )
|
|
{
|
|
checkSlow( ( vertFlagLock & f ) == 0 );
|
|
vertFlagLock |= f;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
FORCEINLINE void TMeshSimplifier<T, NumAttributes>::UnlockVertFlags( uint32 f )
|
|
{
|
|
vertFlagLock &= ~f;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
FORCEINLINE void TMeshSimplifier<T, NumAttributes>::LockTriFlags( uint32 f )
|
|
{
|
|
checkSlow( ( triFlagLock & f ) == 0 );
|
|
triFlagLock |= f;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
FORCEINLINE void TMeshSimplifier<T, NumAttributes>::UnlockTriFlags( uint32 f )
|
|
{
|
|
triFlagLock &= ~f;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
void TMeshSimplifier<T, NumAttributes>::InitVert( TSimpVert<T>* v )
|
|
{
|
|
check( v->adjTris.Num() > 0 );
|
|
|
|
TArray< TSimpVert<T>*, TInlineAllocator<64> > adjVerts;
|
|
v->FindAdjacentVerts( adjVerts );
|
|
|
|
TSimpVert<T>* v0 = v;
|
|
for( TSimpVert<T>* v1 : adjVerts )
|
|
{
|
|
if( v0 < v1 )
|
|
{
|
|
check( v0->GetMaterialIndex() == v1->GetMaterialIndex() );
|
|
|
|
// add edge
|
|
edges.AddDefaulted();
|
|
TSimpEdge<T>& edge = edges.Last();
|
|
edge.v0 = v0;
|
|
edge.v1 = v1;
|
|
}
|
|
}
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
void TMeshSimplifier<T, NumAttributes>::GroupVerts()
|
|
{
|
|
// group verts that share a point
|
|
FHashTable HashTable( 1 << FMath::Min( 16u, FMath::FloorLog2( numSVerts / 2 ) ), numSVerts );
|
|
|
|
for( int i = 0; i < numSVerts; i++ )
|
|
{
|
|
HashTable.Add( HashPoint( sVerts[i].GetPos() ), i );
|
|
}
|
|
|
|
for( int i = 0; i < numSVerts; i++ )
|
|
{
|
|
// already grouped
|
|
if( sVerts[i].next != &sVerts[i] )
|
|
{
|
|
continue;
|
|
}
|
|
|
|
// find any matching verts
|
|
uint32 hash = HashPoint( sVerts[i].GetPos() );
|
|
for( int j = HashTable.First( hash ); HashTable.IsValid(j); j = HashTable.Next(j) )
|
|
{
|
|
TSimpVert<T>* v1 = &sVerts[i];
|
|
TSimpVert<T>* v2 = &sVerts[j];
|
|
|
|
if( v1 == v2 )
|
|
continue;
|
|
|
|
// link
|
|
if( v1->GetPos() == v2->GetPos() )
|
|
{
|
|
checkSlow( v2->next == v2 );
|
|
checkSlow( v2->prev == v2 );
|
|
|
|
v2->next = v1->next;
|
|
v2->prev = v1;
|
|
v2->next->prev = v2;
|
|
v2->prev->next = v2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
void TMeshSimplifier<T, NumAttributes>::GroupEdges()
|
|
{
|
|
FHashTable HashTable( 1 << FMath::Min( 16u, FMath::FloorLog2( edges.Num() / 2 ) ), edges.Num() );
|
|
for( int i = 0; i < edges.Num(); i++ )
|
|
{
|
|
uint32 Hash0 = HashPoint( edges[i].v0->GetPos() );
|
|
uint32 Hash1 = HashPoint( edges[i].v1->GetPos() );
|
|
uint32 Hash = Murmur32( { FMath::Min( Hash0, Hash1 ), FMath::Max( Hash0, Hash1 ) } );
|
|
HashTable.Add( Hash, i );
|
|
}
|
|
|
|
for( int i = 0; i < edges.Num(); i++ )
|
|
{
|
|
// already grouped
|
|
if( edges[i].next != &edges[i] )
|
|
{
|
|
continue;
|
|
}
|
|
|
|
// find any matching edges
|
|
uint32 Hash0 = HashPoint( edges[i].v0->GetPos() );
|
|
uint32 Hash1 = HashPoint( edges[i].v1->GetPos() );
|
|
uint32 Hash = Murmur32( { FMath::Min( Hash0, Hash1 ), FMath::Max( Hash0, Hash1 ) } );
|
|
for( uint32 j = HashTable.First( Hash ); HashTable.IsValid(j); j = HashTable.Next(j) )
|
|
{
|
|
TSimpEdge<T>* e1 = &edges[i];
|
|
TSimpEdge<T>* e2 = &edges[j];
|
|
|
|
if( e1 == e2 )
|
|
continue;
|
|
|
|
bool m1 = e1->v0->GetPos() == e2->v0->GetPos() &&
|
|
e1->v1->GetPos() == e2->v1->GetPos();
|
|
|
|
bool m2 = e1->v0->GetPos() == e2->v1->GetPos() &&
|
|
e1->v1->GetPos() == e2->v0->GetPos();
|
|
|
|
// backwards
|
|
if( m2 )
|
|
{
|
|
Swap( e2->v0, e2->v1 );
|
|
}
|
|
|
|
// link
|
|
if( m1 || m2 )
|
|
{
|
|
check( e2->next == e2 );
|
|
check( e2->prev == e2 );
|
|
|
|
e2->next = e1->next;
|
|
e2->prev = e1;
|
|
e2->next->prev = e2;
|
|
e2->prev->next = e2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
void TMeshSimplifier<T, NumAttributes>::InitCosts()
|
|
{
|
|
for( int i = 0; i < edges.Num(); i++ )
|
|
{
|
|
float cost = ComputeEdgeCollapseCost( &edges[i] );
|
|
check( FMath::IsFinite( cost ) );
|
|
edgeHeap.Add( cost, i );
|
|
}
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
TQuadricAttr< NumAttributes > TMeshSimplifier<T, NumAttributes>::GetQuadric( TSimpVert<T>* v )
|
|
{
|
|
#if SIMP_CACHE
|
|
uint32 VertIndex = GetVertIndex( v );
|
|
if( VertQuadricsValid[ VertIndex ] )
|
|
{
|
|
return VertQuadrics[ VertIndex ];
|
|
}
|
|
#endif
|
|
|
|
QuadricType vertQuadric;
|
|
vertQuadric.Zero();
|
|
|
|
// sum tri quadrics
|
|
for( TriIterator i = v->adjTris.Begin(); i != v->adjTris.End(); ++i )
|
|
{
|
|
TSimpTri<T>* tri = *i;
|
|
#if SIMP_CACHE
|
|
uint32 TriIndex = GetTriIndex( tri );
|
|
if( TriQuadricsValid[ TriIndex ] )
|
|
{
|
|
vertQuadric += TriQuadrics[ TriIndex ];
|
|
}
|
|
else
|
|
{
|
|
QuadricType triQuadric(
|
|
tri->verts[0]->GetPos(), tri->verts[1]->GetPos(), tri->verts[2]->GetPos(),
|
|
tri->verts[0]->GetAttributes(), tri->verts[1]->GetAttributes(), tri->verts[2]->GetAttributes(),
|
|
attributeWeights );
|
|
vertQuadric += triQuadric;
|
|
|
|
TriQuadricsValid[ TriIndex ] = true;
|
|
TriQuadrics[ TriIndex ] = triQuadric;
|
|
}
|
|
#else
|
|
QuadricType triQuadric(
|
|
tri->verts[0]->GetPos(), tri->verts[1]->GetPos(), tri->verts[2]->GetPos(),
|
|
tri->verts[0]->GetAttributes(), tri->verts[1]->GetAttributes(), tri->verts[2]->GetAttributes(),
|
|
attributeWeights );
|
|
vertQuadric += triQuadric;
|
|
#endif
|
|
}
|
|
|
|
#if SIMP_CACHE
|
|
VertQuadricsValid[ VertIndex ] = true;
|
|
VertQuadrics[ VertIndex ] = vertQuadric;
|
|
#endif
|
|
|
|
return vertQuadric;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
FQuadric TMeshSimplifier<T, NumAttributes>::GetEdgeQuadric( TSimpVert<T>* v )
|
|
{
|
|
#if SIMP_CACHE
|
|
uint32 VertIndex = GetVertIndex( v );
|
|
if( EdgeQuadricsValid[ VertIndex ] )
|
|
{
|
|
return EdgeQuadrics[ VertIndex ];
|
|
}
|
|
#endif
|
|
|
|
FQuadric vertQuadric;
|
|
vertQuadric.Zero();
|
|
|
|
TArray< TSimpVert<T>*, TInlineAllocator<64> > adjVerts;
|
|
v->FindAdjacentVerts( adjVerts );
|
|
|
|
LockTriFlags( SIMP_MARK1 );
|
|
v->EnableAdjTriFlags( SIMP_MARK1 );
|
|
|
|
for( TSimpVert<T>* vert : adjVerts )
|
|
{
|
|
TSimpTri<T>* face = NULL;
|
|
int faceCount = 0;
|
|
for( TriIterator j = vert->adjTris.Begin(); j != vert->adjTris.End(); ++j )
|
|
{
|
|
TSimpTri<T>* tri = *j;
|
|
if( tri->TestFlags( SIMP_MARK1 ) )
|
|
{
|
|
face = tri;
|
|
faceCount++;
|
|
}
|
|
}
|
|
|
|
if( faceCount == 1 )
|
|
{
|
|
// only one face on this edge
|
|
FQuadric edgeQuadric( v->GetPos(), vert->GetPos(), face->GetNormal(), 256.0f );
|
|
vertQuadric += edgeQuadric;
|
|
}
|
|
}
|
|
|
|
v->DisableAdjTriFlags( SIMP_MARK1 );
|
|
UnlockTriFlags( SIMP_MARK1 );
|
|
|
|
#if SIMP_CACHE
|
|
EdgeQuadricsValid[ VertIndex ] = true;
|
|
EdgeQuadrics[ VertIndex ] = vertQuadric;
|
|
#endif
|
|
|
|
return vertQuadric;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
FORCEINLINE uint32 TMeshSimplifier<T, NumAttributes>::GetVertIndex( const TSimpVert<T>* vert ) const
|
|
{
|
|
ptrdiff_t Index = vert - &sVerts[0];
|
|
return (uint32)Index;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
FORCEINLINE uint32 TMeshSimplifier<T, NumAttributes>::GetTriIndex( const TSimpTri<T>* tri ) const
|
|
{
|
|
ptrdiff_t Index = tri - &sTris[0];
|
|
return (uint32)Index;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
FORCEINLINE uint32 TMeshSimplifier<T, NumAttributes>::GetEdgeIndex( const TSimpEdge<T>* edge ) const
|
|
{
|
|
ptrdiff_t Index = edge - &edges[0];
|
|
return (uint32)Index;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
FORCEINLINE uint32 TMeshSimplifier<T, NumAttributes>::HashPoint( const FVector& p ) const
|
|
{
|
|
union { float f; uint32 i; } x;
|
|
union { float f; uint32 i; } y;
|
|
union { float f; uint32 i; } z;
|
|
|
|
x.f = p.X;
|
|
y.f = p.Y;
|
|
z.f = p.Z;
|
|
|
|
return Murmur32( { x.i, y.i, z.i } );
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
FORCEINLINE uint32 TMeshSimplifier<T, NumAttributes>::HashEdge( const TSimpVert<T>* u, const TSimpVert<T>* v ) const
|
|
{
|
|
uint32 ui = GetVertIndex( u );
|
|
uint32 vi = GetVertIndex( v );
|
|
// must be symmetrical
|
|
return Murmur32( { FMath::Min( ui, vi ), FMath::Max( ui, vi ) } );
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
TSimpEdge<T>* TMeshSimplifier<T, NumAttributes>::FindEdge( const TSimpVert<T>* u, const TSimpVert<T>* v )
|
|
{
|
|
uint32 hash = HashEdge( u, v );
|
|
for( uint32 i = edgeHash.First( hash ); edgeHash.IsValid(i); i = edgeHash.Next(i) )
|
|
{
|
|
if( ( edges[i].v0 == u && edges[i].v1 == v ) ||
|
|
( edges[i].v0 == v && edges[i].v1 == u ) )
|
|
{
|
|
return &edges[i];
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
void TMeshSimplifier<T, NumAttributes>::RemoveEdge( TSimpEdge<T>* edge )
|
|
{
|
|
if( edge->TestFlags( SIMP_REMOVED ) )
|
|
{
|
|
checkSlow( edge->next == edge );
|
|
checkSlow( edge->prev == edge );
|
|
return;
|
|
}
|
|
|
|
uint32 hash = HashEdge( edge->v0, edge->v1 );
|
|
for( uint32 i = edgeHash.First( hash ); edgeHash.IsValid(i); i = edgeHash.Next(i) )
|
|
{
|
|
if( &edges[i] == edge )
|
|
{
|
|
edgeHash.Remove( hash, i );
|
|
edgeHeap.Remove( i );
|
|
break;
|
|
}
|
|
}
|
|
|
|
// remove edge
|
|
edge->EnableFlags( SIMP_REMOVED );
|
|
|
|
// ungroup edge
|
|
edge->prev->next = edge->next;
|
|
edge->next->prev = edge->prev;
|
|
edge->next = edge;
|
|
edge->prev = edge;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
void TMeshSimplifier<T, NumAttributes>::ReplaceEdgeVert( const TSimpVert<T>* oldV, const TSimpVert<T>* otherV, TSimpVert<T>* newV )
|
|
{
|
|
uint32 hash = HashEdge( oldV, otherV );
|
|
uint32 index;
|
|
for( index = edgeHash.First( hash ); edgeHash.IsValid( index ); index = edgeHash.Next( index ) )
|
|
{
|
|
if( ( edges[ index ].v0 == oldV && edges[ index ].v1 == otherV ) ||
|
|
( edges[ index ].v1 == oldV && edges[ index ].v0 == otherV ) )
|
|
break;
|
|
}
|
|
|
|
checkSlow( index != -1 );
|
|
TSimpEdge<T>* edge = &edges[ index ];
|
|
|
|
edgeHash.Remove( hash, index );
|
|
|
|
TSimpEdge<T>* ExistingEdge = FindEdge( newV, otherV );
|
|
if( ExistingEdge )
|
|
{
|
|
// Not entirely sure why this happens. I believe these are invalid edges from bridge tris.
|
|
RemoveEdge( ExistingEdge );
|
|
}
|
|
|
|
if( newV )
|
|
{
|
|
edgeHash.Add( HashEdge( newV, otherV ), index );
|
|
|
|
if( edge->v0 == oldV )
|
|
edge->v0 = newV;
|
|
else
|
|
edge->v1 = newV;
|
|
}
|
|
else
|
|
{
|
|
// remove edge
|
|
edge->EnableFlags( SIMP_REMOVED );
|
|
|
|
// ungroup old edge
|
|
edge->prev->next = edge->next;
|
|
edge->next->prev = edge->prev;
|
|
edge->next = edge;
|
|
edge->prev = edge;
|
|
|
|
edgeHeap.Remove( index );
|
|
}
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
void TMeshSimplifier<T, NumAttributes>::CollapseEdgeVert( const TSimpVert<T>* oldV, const TSimpVert<T>* otherV, TSimpVert<T>* newV )
|
|
{
|
|
uint32 hash = HashEdge( oldV, otherV );
|
|
uint32 index;
|
|
for( index = edgeHash.First( hash ); edgeHash.IsValid( index ); index = edgeHash.Next( index ) )
|
|
{
|
|
if( ( edges[ index ].v0 == oldV && edges[ index ].v1 == otherV ) ||
|
|
( edges[ index ].v1 == oldV && edges[ index ].v0 == otherV ) )
|
|
break;
|
|
}
|
|
|
|
checkSlow( index != -1 );
|
|
TSimpEdge<T>* edge = &edges[ index ];
|
|
|
|
edgeHash.Remove( hash, index );
|
|
edgeHeap.Remove( index );
|
|
|
|
// remove edge
|
|
edge->EnableFlags( SIMP_REMOVED );
|
|
|
|
// ungroup old edge
|
|
edge->prev->next = edge->next;
|
|
edge->next->prev = edge->prev;
|
|
edge->next = edge;
|
|
edge->prev = edge;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
void TMeshSimplifier<T, NumAttributes>::GatherUpdates( TSimpVert<T>* v )
|
|
{
|
|
// Update all tris touching collapse edge.
|
|
for( TriIterator i = v->adjTris.Begin(); i != v->adjTris.End(); ++i )
|
|
{
|
|
updateTris.AddUnique( *i );
|
|
}
|
|
|
|
TArray< TSimpVert<T>*, TInlineAllocator<64> > adjVerts;
|
|
v->FindAdjacentVerts( adjVerts );
|
|
|
|
LockVertFlags( SIMP_MARK1 | SIMP_MARK2 );
|
|
|
|
// Update verts from tris adjacent to collapsed edge
|
|
for( int i = 0, Num = adjVerts.Num(); i < Num; i++ )
|
|
{
|
|
updateVerts.AddUnique( adjVerts[i] );
|
|
|
|
adjVerts[i]->EnableFlags( SIMP_MARK2 );
|
|
}
|
|
|
|
// update the costs of all edges connected to any face adjacent to v
|
|
for( int i = 0, Num = adjVerts.Num(); i < Num; i++ )
|
|
{
|
|
adjVerts[i]->EnableAdjVertFlags( SIMP_MARK1 );
|
|
|
|
for( TriIterator j = adjVerts[i]->adjTris.Begin(); j != adjVerts[i]->adjTris.End(); ++j )
|
|
{
|
|
TSimpTri<T>* tri = *j;
|
|
for( int k = 0; k < 3; k++ )
|
|
{
|
|
TSimpVert<T>* vert = tri->verts[k];
|
|
if( vert->TestFlags( SIMP_MARK1 ) && !vert->TestFlags( SIMP_MARK2 ) )
|
|
{
|
|
TSimpEdge<T>* edge = FindEdge( adjVerts[i], vert );
|
|
updateEdges.AddUnique( edge );
|
|
}
|
|
vert->DisableFlags( SIMP_MARK1 );
|
|
}
|
|
}
|
|
adjVerts[i]->DisableFlags( SIMP_MARK2 );
|
|
}
|
|
|
|
UnlockVertFlags( SIMP_MARK1 | SIMP_MARK2 );
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
float TMeshSimplifier<T, NumAttributes>::ComputeNewVerts( TSimpEdge<T>* edge, TArray< T, TInlineAllocator<16> >& newVerts )
|
|
{
|
|
TSimpEdge<T>* e;
|
|
TSimpVert<T>* v;
|
|
|
|
TArray< QuadricType, TInlineAllocator<16> > quadrics;
|
|
|
|
TQuadricAttrOptimizer< NumAttributes > optimizer;
|
|
|
|
LockVertFlags( SIMP_MARK1 );
|
|
|
|
edge->v0->EnableFlagsGroup( SIMP_MARK1 );
|
|
edge->v1->EnableFlagsGroup( SIMP_MARK1 );
|
|
|
|
// add edges
|
|
e = edge;
|
|
do {
|
|
checkSlow( e == FindEdge( e->v0, e->v1 ) );
|
|
checkSlow( e->v0->adjTris.Num() > 0 );
|
|
checkSlow( e->v1->adjTris.Num() > 0 );
|
|
checkSlow( e->v0->GetMaterialIndex() == e->v1->GetMaterialIndex() );
|
|
|
|
newVerts.Add( e->v0->vert );
|
|
|
|
QuadricType quadric;
|
|
quadric = GetQuadric( e->v0 );
|
|
quadric += GetQuadric( e->v1 );
|
|
quadrics.Add( quadric );
|
|
optimizer.AddQuadric( quadric );
|
|
|
|
e->v0->DisableFlags( SIMP_MARK1 );
|
|
e->v1->DisableFlags( SIMP_MARK1 );
|
|
|
|
e = e->next;
|
|
} while( e != edge );
|
|
|
|
// add remainder verts
|
|
v = edge->v0;
|
|
do {
|
|
if( v->TestFlags( SIMP_MARK1 ) )
|
|
{
|
|
newVerts.Add( v->vert );
|
|
|
|
QuadricType quadric;
|
|
quadric = GetQuadric( v );
|
|
quadrics.Add( quadric );
|
|
optimizer.AddQuadric( quadric );
|
|
|
|
v->DisableFlags( SIMP_MARK1 );
|
|
}
|
|
v = v->next;
|
|
} while( v != edge->v0 );
|
|
|
|
v = edge->v1;
|
|
do {
|
|
if( v->TestFlags( SIMP_MARK1 ) )
|
|
{
|
|
newVerts.Add( v->vert );
|
|
|
|
QuadricType quadric;
|
|
quadric = GetQuadric( v );
|
|
quadrics.Add( quadric );
|
|
optimizer.AddQuadric( quadric );
|
|
|
|
v->DisableFlags( SIMP_MARK1 );
|
|
}
|
|
v = v->next;
|
|
} while( v != edge->v1 );
|
|
|
|
UnlockVertFlags( SIMP_MARK1 );
|
|
|
|
check( quadrics.Num() <= 256 );
|
|
|
|
FQuadric edgeQuadric;
|
|
edgeQuadric.Zero();
|
|
|
|
v = edge->v0;
|
|
do {
|
|
edgeQuadric += GetEdgeQuadric( v );
|
|
v = v->next;
|
|
} while( v != edge->v0 );
|
|
|
|
v = edge->v1;
|
|
do {
|
|
edgeQuadric += GetEdgeQuadric( v );
|
|
v = v->next;
|
|
} while( v != edge->v1 );
|
|
|
|
optimizer.AddQuadric( edgeQuadric );
|
|
|
|
FVector newPos;
|
|
{
|
|
bool bLocked0 = edge->v0->TestFlags( SIMP_LOCKED );
|
|
bool bLocked1 = edge->v1->TestFlags( SIMP_LOCKED );
|
|
//checkSlow( !bLocked0 || !bLocked1 );
|
|
|
|
// find position
|
|
if( bLocked0 )
|
|
{
|
|
// v0 position
|
|
newPos = edge->v0->GetPos();
|
|
}
|
|
else if( bLocked1 )
|
|
{
|
|
// v1 position
|
|
newPos = edge->v1->GetPos();
|
|
}
|
|
else
|
|
{
|
|
// optimal position
|
|
bool valid = optimizer.Optimize( newPos );
|
|
if( !valid )
|
|
{
|
|
// Couldn't find optimal so choose middle
|
|
newPos = ( edge->v0->GetPos() + edge->v1->GetPos() ) * 0.5f;
|
|
}
|
|
}
|
|
}
|
|
|
|
float cost = 0.0f;
|
|
|
|
for( int i = 0; i < quadrics.Num(); i++ )
|
|
{
|
|
newVerts[i].GetPos() = newPos;
|
|
|
|
if( quadrics[i].a > 1e-8 )
|
|
{
|
|
// calculate vert attributes from the new position
|
|
quadrics[i].CalcAttributes( newVerts[i].GetPos(), newVerts[i].GetAttributes(), attributeWeights );
|
|
newVerts[i].Correct();
|
|
}
|
|
|
|
// sum cost of new verts
|
|
cost += quadrics[i].Evaluate( newVerts[i].GetPos(), newVerts[i].GetAttributes(), attributeWeights );
|
|
}
|
|
|
|
cost += edgeQuadric.Evaluate( newPos );
|
|
|
|
return cost;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
float TMeshSimplifier<T, NumAttributes>::ComputeEdgeCollapseCost( TSimpEdge<T>* edge )
|
|
{
|
|
TArray< T, TInlineAllocator<16> > newVerts;
|
|
float cost = ComputeNewVerts( edge, newVerts );
|
|
|
|
const FVector& newPos = newVerts[0].GetPos();
|
|
|
|
// add penalties
|
|
// the below penalty code works with groups so no need to worry about remainder verts
|
|
TSimpVert<T>* u = edge->v0;
|
|
TSimpVert<T>* v = edge->v1;
|
|
TSimpVert<T>* vert;
|
|
|
|
float penalty = 0.0f;
|
|
|
|
{
|
|
const int degreeLimit = 24;
|
|
const float degreePenalty = 100.0f;
|
|
|
|
int degree = 0;
|
|
|
|
// u
|
|
vert = u;
|
|
do {
|
|
degree += vert->adjTris.Num();
|
|
vert = vert->next;
|
|
} while( vert != u );
|
|
|
|
// v
|
|
vert = v;
|
|
do {
|
|
degree += vert->adjTris.Num();
|
|
vert = vert->next;
|
|
} while( vert != v );
|
|
|
|
if( degree > degreeLimit )
|
|
penalty += degreePenalty * ( degree - degreeLimit );
|
|
}
|
|
|
|
{
|
|
// Penalty to prevent edge folding
|
|
const float invalidPenalty = 1000000.0f;
|
|
|
|
LockTriFlags( SIMP_MARK1 );
|
|
|
|
v->EnableAdjTriFlagsGroup( SIMP_MARK1 );
|
|
|
|
// u
|
|
vert = u;
|
|
do {
|
|
for( TriIterator i = vert->adjTris.Begin(); i != vert->adjTris.End(); ++i )
|
|
{
|
|
TSimpTri<T>* tri = *i;
|
|
if( !tri->TestFlags( SIMP_MARK1 ) )
|
|
penalty += tri->ReplaceVertexIsValid( vert, newPos ) ? 0.0f : invalidPenalty;
|
|
tri->DisableFlags( SIMP_MARK1 );
|
|
}
|
|
vert = vert->next;
|
|
} while( vert != u );
|
|
|
|
// v
|
|
vert = v;
|
|
do {
|
|
for( TriIterator i = vert->adjTris.Begin(); i != vert->adjTris.End(); ++i )
|
|
{
|
|
TSimpTri<T>* tri = *i;
|
|
if( tri->TestFlags( SIMP_MARK1 ) )
|
|
penalty += tri->ReplaceVertexIsValid( vert, newPos ) ? 0.0f : invalidPenalty;
|
|
tri->DisableFlags( SIMP_MARK1 );
|
|
}
|
|
vert = vert->next;
|
|
} while( vert != v );
|
|
|
|
UnlockTriFlags( SIMP_MARK1 );
|
|
}
|
|
|
|
return cost + penalty;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
void TMeshSimplifier<T, NumAttributes>::Collapse( TSimpEdge<T>* edge )
|
|
{
|
|
TSimpVert<T>* u = edge->v0;
|
|
TSimpVert<T>* v = edge->v1;
|
|
|
|
// Collapse the edge uv by moving vertex u onto v
|
|
checkSlow( u && v );
|
|
checkSlow( edge == FindEdge( u, v ) );
|
|
checkSlow( u->adjTris.Num() > 0 );
|
|
checkSlow( v->adjTris.Num() > 0 );
|
|
checkSlow( u->GetMaterialIndex() == v->GetMaterialIndex() );
|
|
|
|
if( u->TestFlags( SIMP_LOCKED ) )
|
|
v->EnableFlags( SIMP_LOCKED );
|
|
|
|
LockVertFlags( SIMP_MARK1 );
|
|
|
|
// update edges from u to v
|
|
u->EnableAdjVertFlags( SIMP_MARK1 );
|
|
v->DisableAdjVertFlags( SIMP_MARK1 );
|
|
|
|
if( u->TestFlags( SIMP_MARK1 ) )
|
|
{
|
|
// Invalid edge, results from collapsing a bridge tri
|
|
// There are no actual triangles connecting these verts
|
|
u->DisableAdjVertFlags( SIMP_MARK1 );
|
|
UnlockVertFlags( SIMP_MARK1 );
|
|
return;
|
|
}
|
|
|
|
for( TriIterator i = u->adjTris.Begin(); i != u->adjTris.End(); ++i )
|
|
{
|
|
TSimpTri<T>* tri = *i;
|
|
for( int j = 0; j < 3; j++ )
|
|
{
|
|
TSimpVert<T>* vert = tri->verts[j];
|
|
if( vert->TestFlags( SIMP_MARK1 ) )
|
|
{
|
|
ReplaceEdgeVert( u, vert, v );
|
|
vert->DisableFlags( SIMP_MARK1 );
|
|
}
|
|
}
|
|
}
|
|
|
|
// remove dead edges
|
|
u->EnableAdjVertFlags( SIMP_MARK1 );
|
|
u->DisableFlags( SIMP_MARK1 );
|
|
v->DisableFlags( SIMP_MARK1 );
|
|
|
|
for( TriIterator i = v->adjTris.Begin(); i != v->adjTris.End(); ++i )
|
|
{
|
|
TSimpTri<T>* tri = *i;
|
|
for( int j = 0; j < 3; j++ )
|
|
{
|
|
TSimpVert<T>* vert = tri->verts[j];
|
|
if( vert->TestFlags( SIMP_MARK1 ) )
|
|
{
|
|
ReplaceEdgeVert( u, vert, NULL );
|
|
vert->DisableFlags( SIMP_MARK1 );
|
|
}
|
|
}
|
|
}
|
|
|
|
u->DisableAdjVertFlags( SIMP_MARK1 );
|
|
|
|
// fixup triangles
|
|
for( TriIterator i = u->adjTris.Begin(); i != u->adjTris.End(); ++i )
|
|
{
|
|
TSimpTri<T>* tri = *i;
|
|
checkSlow( !tri->TestFlags( SIMP_REMOVED ) );
|
|
checkSlow( tri->HasVertex(u) );
|
|
|
|
if( tri->HasVertex(v) )
|
|
{
|
|
// delete triangles on edge uv
|
|
numTris--;
|
|
tri->EnableFlags( SIMP_REMOVED );
|
|
#if SIMP_CACHE
|
|
TriQuadricsValid[ GetTriIndex( tri ) ] = false;
|
|
#endif
|
|
|
|
// remove references to tri
|
|
for( int j = 0; j < 3; j++ )
|
|
{
|
|
TSimpVert<T>* vert = tri->verts[j];
|
|
checkSlow( !vert->TestFlags( SIMP_REMOVED ) );
|
|
if( vert != u )
|
|
{
|
|
vert->adjTris.Remove( tri );
|
|
#if 0
|
|
if( vert != v && vert->adjTris.Num() == 0 ) {
|
|
if( !vert->TestFlags( SIMP_REMOVED ) ) { // not sure why this happens
|
|
numVerts--;
|
|
vert->EnableFlags( SIMP_REMOVED );
|
|
}
|
|
ReplaceEdgeVert( v, vert, NULL );
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// update triangles to have v instead of u
|
|
tri->ReplaceVertex( u, v );
|
|
v->adjTris.Add( tri );
|
|
}
|
|
}
|
|
|
|
#if SIMP_CACHE
|
|
// remove modified verts and tris from cache
|
|
v->EnableAdjVertFlags( SIMP_MARK1 );
|
|
for( TriIterator i = v->adjTris.Begin(); i != v->adjTris.End(); ++i )
|
|
{
|
|
TSimpTri<T>* tri = *i;
|
|
TriQuadricsValid[ GetTriIndex( tri ) ] = false;
|
|
|
|
for( int j = 0; j < 3; j++ )
|
|
{
|
|
TSimpVert<T>* vert = tri->verts[j];
|
|
if( vert->TestFlags( SIMP_MARK1 ) )
|
|
{
|
|
VertQuadricsValid[ GetVertIndex( vert ) ] = false;
|
|
vert->DisableFlags( SIMP_MARK1 );
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
UnlockVertFlags( SIMP_MARK1 );
|
|
|
|
u->adjTris.Clear(); // u has been removed
|
|
u->EnableFlags( SIMP_REMOVED );
|
|
numVerts--;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
void TMeshSimplifier<T, NumAttributes>::UpdateTris()
|
|
{
|
|
// remove degenerate triangles
|
|
// not sure why this happens
|
|
for( TSimpTri<T>* tri : updateTris )
|
|
{
|
|
if( tri->TestFlags( SIMP_REMOVED ) )
|
|
continue;
|
|
|
|
#if SIMP_CACHE
|
|
TriQuadricsValid[ GetTriIndex( tri ) ] = false;
|
|
#endif
|
|
|
|
const FVector& p0 = tri->verts[0]->GetPos();
|
|
const FVector& p1 = tri->verts[1]->GetPos();
|
|
const FVector& p2 = tri->verts[2]->GetPos();
|
|
const FVector n = ( p2 - p0 ) ^ ( p1 - p0 );
|
|
|
|
if( n.SizeSquared() == 0.0f )
|
|
{
|
|
numTris--;
|
|
tri->EnableFlags( SIMP_REMOVED );
|
|
|
|
// remove references to tri
|
|
for( int j = 0; j < 3; j++ )
|
|
{
|
|
TSimpVert<T>* vert = tri->verts[j];
|
|
vert->adjTris.Remove( tri );
|
|
// orphaned verts are removed below
|
|
}
|
|
}
|
|
}
|
|
updateTris.Reset();
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
void TMeshSimplifier<T, NumAttributes>::UpdateVerts()
|
|
{
|
|
// remove orphaned verts
|
|
for( TSimpVert<T>* vert : updateVerts )
|
|
{
|
|
if( vert->TestFlags( SIMP_REMOVED ) )
|
|
continue;
|
|
|
|
#if SIMP_CACHE
|
|
VertQuadricsValid[ GetVertIndex( vert ) ] = false;
|
|
EdgeQuadricsValid[ GetVertIndex( vert ) ] = false;
|
|
#endif
|
|
|
|
if( vert->adjTris.Num() == 0 )
|
|
{
|
|
numVerts--;
|
|
vert->EnableFlags( SIMP_REMOVED );
|
|
|
|
// ungroup
|
|
vert->prev->next = vert->next;
|
|
vert->next->prev = vert->prev;
|
|
vert->next = vert;
|
|
vert->prev = vert;
|
|
}
|
|
}
|
|
updateVerts.Reset();
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
void TMeshSimplifier<T, NumAttributes>::UpdateEdges()
|
|
{
|
|
uint32 NumEdges = updateEdges.Num();
|
|
|
|
// add all grouped edges
|
|
for( uint32 i = 0; i < NumEdges; i++ )
|
|
{
|
|
TSimpEdge<T>* edge = updateEdges[i];
|
|
|
|
if( edge->TestFlags( SIMP_REMOVED ) )
|
|
continue;
|
|
|
|
TSimpEdge<T>* e = edge;
|
|
do {
|
|
updateEdges.AddUnique(e);
|
|
e = e->next;
|
|
} while( e != edge );
|
|
}
|
|
|
|
// remove dead edges
|
|
for( uint32 i = 0, Num = updateEdges.Num(); i < Num; i++ )
|
|
{
|
|
TSimpEdge<T>* edge = updateEdges[i];
|
|
|
|
if( edge->TestFlags( SIMP_REMOVED ) )
|
|
continue;
|
|
|
|
if( edge->v0->TestFlags( SIMP_REMOVED ) ||
|
|
edge->v1->TestFlags( SIMP_REMOVED ) )
|
|
{
|
|
RemoveEdge( edge );
|
|
continue;
|
|
}
|
|
}
|
|
|
|
// Fix edge groups
|
|
{
|
|
FHashTable HashTable( 128, NumEdges );
|
|
|
|
// ungroup edges
|
|
for( uint32 i = 0, Num = updateEdges.Num(); i < Num; i++ )
|
|
{
|
|
TSimpEdge<T>* edge = updateEdges[i];
|
|
|
|
if( edge->TestFlags( SIMP_REMOVED ) )
|
|
continue;
|
|
|
|
edge->next = edge;
|
|
edge->prev = edge;
|
|
|
|
HashTable.Add( HashPoint( edge->v0->GetPos() ) ^ HashPoint( edge->v1->GetPos() ), i );
|
|
}
|
|
|
|
// regroup edges
|
|
for( uint32 i = 0, Num = updateEdges.Num(); i < Num; i++ )
|
|
{
|
|
TSimpEdge<T>* edge = updateEdges[i];
|
|
|
|
if( edge->TestFlags( SIMP_REMOVED ) )
|
|
continue;
|
|
|
|
// already grouped
|
|
if( edge->next != edge )
|
|
continue;
|
|
|
|
// find any matching edges
|
|
uint32 hash = HashPoint( edge->v0->GetPos() ) ^ HashPoint( edge->v1->GetPos() );
|
|
for( uint32 j = HashTable.First( hash ); HashTable.IsValid(j); j = HashTable.Next( j ) )
|
|
{
|
|
TSimpEdge<T>* e1 = updateEdges[i];
|
|
TSimpEdge<T>* e2 = updateEdges[j];
|
|
|
|
if( e1 == e2 )
|
|
continue;
|
|
|
|
bool m1 = e1->v0->GetPos() == e2->v0->GetPos() &&
|
|
e1->v1->GetPos() == e2->v1->GetPos();
|
|
|
|
bool m2 = e1->v0->GetPos() == e2->v1->GetPos() &&
|
|
e1->v1->GetPos() == e2->v0->GetPos();
|
|
|
|
// backwards
|
|
if( m2 )
|
|
Swap( e2->v0, e2->v1 );
|
|
|
|
// link
|
|
if( m1 || m2 )
|
|
{
|
|
checkSlow( e2->next == e2 );
|
|
checkSlow( e2->prev == e2 );
|
|
|
|
e2->next = e1->next;
|
|
e2->prev = e1;
|
|
e2->next->prev = e2;
|
|
e2->prev->next = e2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// update edges
|
|
for( uint32 i = 0; i < NumEdges; i++ )
|
|
{
|
|
TSimpEdge<T>* edge = updateEdges[i];
|
|
|
|
if( edge->TestFlags( SIMP_REMOVED ) )
|
|
continue;
|
|
|
|
float cost = ComputeEdgeCollapseCost( edge );
|
|
|
|
TSimpEdge<T>* e = edge;
|
|
do {
|
|
uint32 EdgeIndex = GetEdgeIndex(e);
|
|
if( edgeHeap.IsPresent( EdgeIndex ) )
|
|
{
|
|
edgeHeap.Update( cost, EdgeIndex );
|
|
}
|
|
e = e->next;
|
|
} while( e != edge );
|
|
}
|
|
updateEdges.Reset();
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
float TMeshSimplifier<T, NumAttributes>::SimplifyMesh( float maxErrorLimit, int minTris, int minVerts )
|
|
{
|
|
TSimpVert<T>* v;
|
|
TSimpEdge<T>* e;
|
|
|
|
float maxError = 0.0f;
|
|
|
|
while( edgeHeap.Num() > 0 )
|
|
{
|
|
if( numTris <= minTris || numVerts <= minVerts )
|
|
break;
|
|
|
|
// get the next vertex to collapse
|
|
uint32 TopIndex = edgeHeap.Top();
|
|
|
|
float error = edgeHeap.GetKey( TopIndex );
|
|
if( error > maxErrorLimit )
|
|
{
|
|
break;
|
|
}
|
|
maxError = FMath::Max( maxError, error );
|
|
|
|
edgeHeap.Pop();
|
|
|
|
TSimpEdge<T>* top = &edges[ TopIndex ];
|
|
|
|
int numEdges = 0;
|
|
TSimpEdge<T>* edgeList[32];
|
|
|
|
TSimpEdge<T>* edge = top;
|
|
do {
|
|
edgeList[ numEdges++ ] = edge;
|
|
edge = edge->next;
|
|
} while( edge != top );
|
|
|
|
check(top);
|
|
|
|
// skip locked edges
|
|
bool locked = false;
|
|
for( int i = 0; i < numEdges; i++ )
|
|
{
|
|
edge = edgeList[i];
|
|
if( edge->v0->TestFlags( SIMP_LOCKED ) && edge->v1->TestFlags( SIMP_LOCKED ) )
|
|
{
|
|
locked = true;
|
|
}
|
|
}
|
|
if( locked )
|
|
continue;
|
|
|
|
v = top->v0;
|
|
do {
|
|
GatherUpdates( v );
|
|
v = v->next;
|
|
} while( v != top->v0 );
|
|
|
|
v = top->v1;
|
|
do {
|
|
GatherUpdates( v );
|
|
v = v->next;
|
|
} while( v != top->v1 );
|
|
|
|
#if 1
|
|
// remove edges with already removed verts
|
|
// not sure why this happens
|
|
for( int i = 0; i < numEdges; i++ )
|
|
{
|
|
if( edgeList[i]->v0->adjTris.Num() == 0 ||
|
|
edgeList[i]->v1->adjTris.Num() == 0 )
|
|
{
|
|
RemoveEdge( edgeList[i] );
|
|
edgeList[i] = NULL;
|
|
}
|
|
else
|
|
{
|
|
checkSlow( !edgeList[i]->TestFlags( SIMP_REMOVED ) );
|
|
}
|
|
}
|
|
if( top->v0->adjTris.Num() == 0 || top->v1->adjTris.Num() == 0 )
|
|
continue;
|
|
#endif
|
|
|
|
// move verts to new verts
|
|
{
|
|
edge = top;
|
|
|
|
TArray< T, TInlineAllocator<16> > newVerts;
|
|
ComputeNewVerts( edge, newVerts );
|
|
|
|
uint32 i = 0;
|
|
|
|
LockVertFlags( SIMP_MARK1 );
|
|
|
|
edge->v0->EnableFlagsGroup( SIMP_MARK1 );
|
|
edge->v1->EnableFlagsGroup( SIMP_MARK1 );
|
|
|
|
// edges
|
|
e = edge;
|
|
do {
|
|
checkSlow( e == FindEdge( e->v0, e->v1 ) );
|
|
checkSlow( e->v0->adjTris.Num() > 0 );
|
|
checkSlow( e->v1->adjTris.Num() > 0 );
|
|
checkSlow( e->v0->GetMaterialIndex() == e->v1->GetMaterialIndex() );
|
|
|
|
e->v1->vert = newVerts[ i++ ];
|
|
e->v0->DisableFlags( SIMP_MARK1 );
|
|
e->v1->DisableFlags( SIMP_MARK1 );
|
|
|
|
e = e->next;
|
|
} while( e != edge );
|
|
|
|
// remainder verts
|
|
v = edge->v0;
|
|
do {
|
|
if( v->TestFlags( SIMP_MARK1 ) )
|
|
{
|
|
v->vert = newVerts[ i++ ];
|
|
v->DisableFlags( SIMP_MARK1 );
|
|
}
|
|
v = v->next;
|
|
} while( v != edge->v0 );
|
|
|
|
v = edge->v1;
|
|
do {
|
|
if( v->TestFlags( SIMP_MARK1 ) ) {
|
|
v->vert = newVerts[ i++ ];
|
|
v->DisableFlags( SIMP_MARK1 );
|
|
}
|
|
v = v->next;
|
|
} while( v != edge->v1 );
|
|
|
|
UnlockVertFlags( SIMP_MARK1 );
|
|
}
|
|
|
|
// collapse all edges
|
|
for( int i = 0; i < numEdges; i++ )
|
|
{
|
|
edge = edgeList[i];
|
|
if( !edge )
|
|
continue;
|
|
if( edge->TestFlags( SIMP_REMOVED ) ) // wtf?
|
|
continue;
|
|
if( edge->v0->adjTris.Num() == 0 )
|
|
continue;
|
|
if( edge->v1->adjTris.Num() == 0 )
|
|
continue;
|
|
|
|
Collapse( edge );
|
|
RemoveEdge( edge );
|
|
}
|
|
|
|
// add v0 remainder verts to v1
|
|
{
|
|
// combine v0 and v1 groups
|
|
top->v0->next->prev = top->v1->prev;
|
|
top->v1->prev->next = top->v0->next;
|
|
top->v0->next = top->v1;
|
|
top->v1->prev = top->v0;
|
|
|
|
// ungroup removed verts
|
|
uint32 vertListNum = 0;
|
|
TSimpVert<T>* vertList[256];
|
|
|
|
v = top->v1;
|
|
do {
|
|
vertList[ vertListNum++ ] = v;
|
|
v = v->next;
|
|
} while( v != top->v1 );
|
|
|
|
check( vertListNum <= 256 );
|
|
|
|
for( uint32 i = 0; i < vertListNum; i++ )
|
|
{
|
|
v = vertList[i];
|
|
if( v->TestFlags( SIMP_REMOVED ) )
|
|
{
|
|
// ungroup
|
|
v->prev->next = v->next;
|
|
v->next->prev = v->prev;
|
|
v->next = v;
|
|
v->prev = v;
|
|
}
|
|
}
|
|
}
|
|
|
|
{
|
|
// spread locked flag to vert group
|
|
uint32 flags = 0;
|
|
|
|
v = top->v1;
|
|
do {
|
|
flags |= v->flags & SIMP_LOCKED;
|
|
v = v->next;
|
|
} while( v != top->v1 );
|
|
|
|
v = top->v1;
|
|
do {
|
|
v->flags |= flags;
|
|
v = v->next;
|
|
} while( v != top->v1 );
|
|
}
|
|
|
|
UpdateTris();
|
|
UpdateVerts();
|
|
UpdateEdges();
|
|
}
|
|
|
|
// remove degenerate triangles
|
|
// not sure why this happens
|
|
for( int i = 0; i < numSTris; i++ )
|
|
{
|
|
TSimpTri<T>* tri = &sTris[i];
|
|
|
|
if( tri->TestFlags( SIMP_REMOVED ) )
|
|
continue;
|
|
|
|
const FVector& p0 = tri->verts[0]->GetPos();
|
|
const FVector& p1 = tri->verts[1]->GetPos();
|
|
const FVector& p2 = tri->verts[2]->GetPos();
|
|
const FVector n = ( p2 - p0 ) ^ ( p1 - p0 );
|
|
|
|
if( n.SizeSquared() == 0.0f )
|
|
{
|
|
numTris--;
|
|
tri->EnableFlags( SIMP_REMOVED );
|
|
|
|
// remove references to tri
|
|
for( int j = 0; j < 3; j++ )
|
|
{
|
|
TSimpVert<T>* vert = tri->verts[j];
|
|
vert->adjTris.Remove( tri );
|
|
// orphaned verts are removed below
|
|
}
|
|
}
|
|
}
|
|
|
|
// remove orphaned verts
|
|
for( int i = 0; i < numSVerts; i++ )
|
|
{
|
|
TSimpVert<T>* vert = &sVerts[i];
|
|
|
|
if( vert->TestFlags( SIMP_REMOVED ) )
|
|
continue;
|
|
|
|
if( vert->adjTris.Num() == 0 )
|
|
{
|
|
numVerts--;
|
|
vert->EnableFlags( SIMP_REMOVED );
|
|
}
|
|
}
|
|
|
|
return maxError;
|
|
}
|
|
|
|
template< typename T, uint32 NumAttributes >
|
|
void TMeshSimplifier<T, NumAttributes>::OutputMesh( T* verts, uint32* indexes )
|
|
{
|
|
FHashTable HashTable( 4096, GetNumVerts() );
|
|
|
|
#if 1
|
|
int count = 0;
|
|
for( int i = 0; i < numSVerts; i++ )
|
|
count += sVerts[i].TestFlags( SIMP_REMOVED ) ? 0 : 1;
|
|
|
|
check( numVerts == count );
|
|
#endif
|
|
|
|
int numV = 0;
|
|
int numI = 0;
|
|
|
|
for( int i = 0; i < numSTris; i++ )
|
|
{
|
|
if( sTris[i].TestFlags( SIMP_REMOVED ) )
|
|
continue;
|
|
|
|
// TODO this is sloppy. There should be no duped verts. Alias by index.
|
|
for( int j = 0; j < 3; j++ )
|
|
{
|
|
TSimpVert<T>* vert = sTris[i].verts[j];
|
|
checkSlow( !vert->TestFlags( SIMP_REMOVED ) );
|
|
checkSlow( vert->adjTris.Num() != 0 );
|
|
|
|
const FVector& p = vert->GetPos();
|
|
uint32 hash = HashPoint( p );
|
|
uint32 f;
|
|
for( f = HashTable.First( hash ); HashTable.IsValid(f); f = HashTable.Next( f ) )
|
|
{
|
|
if( vert->vert == verts[f] )
|
|
break;
|
|
}
|
|
if( !HashTable.IsValid(f) )
|
|
{
|
|
HashTable.Add( hash, numV );
|
|
verts[ numV ] = vert->vert;
|
|
indexes[ numI++ ] = numV;
|
|
numV++;
|
|
}
|
|
else
|
|
{
|
|
indexes[ numI++ ] = f;
|
|
}
|
|
}
|
|
}
|
|
|
|
check( numV <= numVerts );
|
|
check( numI <= numTris * 3 );
|
|
|
|
numVerts = numV;
|
|
numTris = numI / 3;
|
|
}
|