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MeshModelingTools: Improving the local fit frame in group topology selection to have one of its axes in the global XY plane.

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#rb Jimmy.Andrews
#jira none
#rnx

[CL 15066744 by semion piskarev in ue5-main branch]
This commit is contained in:
semion piskarev
2021-01-13 10:32:38 -04:00
parent c10dcc907e
commit 17beeb5d54
1 changed files with 24 additions and 7 deletions
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31
Engine/Plugins/Experimental/GeometryProcessing/Source/DynamicMesh/Private/GroupTopology.cpp
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@@ -678,13 +678,13 @@ FFrame3d FGroupTopology::GetSelectionFrame(const FGroupTopologySelection& Select
return StartFrame;
}
FVector3d AccumulatedOrigin = FVector3d::Zero();
FVector3d AccumulatedNormal = FVector3d::Zero();
FFrame3d Accumulated;
int AccumCount = 0;
for (int32 CornerID : Selection.SelectedCornerIDs)
{
Accumulated.Origin += Mesh->GetVertex(GetCornerVertexID(CornerID));
AccumulatedOrigin += Mesh->GetVertex(GetCornerVertexID(CornerID));
AccumulatedNormal += FVector3d::UnitZ();
AccumCount++;
}
@@ -694,7 +694,7 @@ FFrame3d FGroupTopology::GetSelectionFrame(const FGroupTopologySelection& Select
const FGroupEdge& Edge = Edges[EdgeID];
FVector3d StartPos = Mesh->GetVertex(Edge.Span.Vertices[0]);
FVector3d EndPos = Mesh->GetVertex(Edge.Span.Vertices[Edge.Span.Vertices.Num() - 1]);
Accumulated.Origin += 0.5*(StartPos + EndPos);
AccumulatedOrigin += 0.5*(StartPos + EndPos);
AccumulatedNormal += FVector3d::UnitZ();
AccumCount++;
}
@@ -704,19 +704,36 @@ FFrame3d FGroupTopology::GetSelectionFrame(const FGroupTopologySelection& Select
if (FindGroupByID(GroupID) != nullptr)
{
FFrame3d GroupFrame = GetGroupFrame(GroupID);
Accumulated.Origin += GroupFrame.Origin;
AccumulatedOrigin += GroupFrame.Origin;
AccumulatedNormal += GroupFrame.Z();
AccumCount++;
}
}
FFrame3d AccumulatedFrame;
if (AccumCount > 0)
{
Accumulated.Origin /= (double)AccumCount;
Accumulated.AlignAxis(2, AccumulatedNormal);
AccumulatedOrigin /= (double)AccumCount;
AccumulatedNormal.Normalize();
// We set our frame Z to be accumulated normal, and the other two axes are unconstrained, so
// we want to set them to something that will make our frame generally more useful. If the normal
// is aligned with world Z, then the entire frame might as well be aligned with world.
if (1 - AccumulatedNormal.Dot(FVector3d::UnitZ()) < KINDA_SMALL_NUMBER)
{
AccumulatedFrame = FFrame3d(AccumulatedOrigin, FQuaterniond::Identity());
}
else
{
// Otherwise, let's place one of the other axes into the XY plane so that the frame is more
// useful for translation. We somewhat arbitrarily choose Y for this.
FVector3d FrameY = AccumulatedNormal.Cross(FVector3d::UnitZ()).Normalized(); // orthogonal to world Z and frame Z
FVector3d FrameX = FrameY.Cross(AccumulatedNormal); // safe to not normalize because already orthogonal
AccumulatedFrame = FFrame3d(AccumulatedOrigin, FrameX, FrameY, AccumulatedNormal);
}
}
return Accumulated;
return AccumulatedFrame;
}