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ToolsFramework: add world-grid snap query that is usable by Tools

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#rb none
#rnx

[CL 10031853 by Ryan Schmidt in Dev-Editor branch]
This commit is contained in:
Ryan Schmidt
2019-11-05 17:19:53 -05:00
parent c885e06ccf
commit 9e762b60d3
2 changed files with 37 additions and 3 deletions
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32
Engine/Source/Editor/Experimental/EditorInteractiveToolsFramework/Private/EdModeInteractiveToolsContext.cpp
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@@ -27,6 +27,26 @@
static float SnapToIncrement(float fValue, float fIncrement, float offset = 0)
{
if (!FMath::IsFinite(fValue))
{
return 0;
}
fValue -= offset;
float sign = FMath::Sign(fValue);
fValue = FMath::Abs(fValue);
int nInc = (int)(fValue / fIncrement);
float fRem = (float)fmod(fValue, fIncrement);
if (fRem > fIncrement / 2)
{
++nInc;
}
return sign * (float)nInc * fIncrement + offset;
}
class FEdModeToolsContextQueriesImpl : public IToolsContextQueriesAPI
{
public:
@@ -115,6 +135,18 @@ public:
int FoundResultCount = 0;
if ((Request.TargetTypes & ESceneSnapQueryTargetType::Grid) != ESceneSnapQueryTargetType::None)
{
FSceneSnapQueryResult SnapResult;
SnapResult.TargetType = ESceneSnapQueryTargetType::Grid;
float SnapSize = GEditor->GetGridSize();
SnapResult.Position.X = SnapToIncrement(Request.Position.X, SnapSize);
SnapResult.Position.Y = SnapToIncrement(Request.Position.Y, SnapSize);
SnapResult.Position.Z = SnapToIncrement(Request.Position.Z, SnapSize);
Results.Add(SnapResult);
FoundResultCount++;
}
//
// Run a snap query by casting ray into the world.
// If a hit is found, we look up what triangle was hit, and then test its vertices and edges