FBoxSphereBounds UPaperGroupedSpriteComponent::CalcBounds(const FTransform& BoundTransform) const
{
bool bHadAnyBounds = false;
FBoxSphereBounds NewBounds(ForceInit);
if (PerInstanceSpriteData.Num() > 0)
{
const FMatrix BoundTransformMatrix = BoundTransform.ToMatrixWithScale();
for (const FSpriteInstanceData& InstanceData : PerInstanceSpriteData)
{
if (InstanceData.SourceSprite != nullptr)
{
const FBoxSphereBounds RenderBounds = InstanceData.SourceSprite->GetRenderBounds();
const FBoxSphereBounds InstanceBounds = RenderBounds.TransformBy(InstanceData.Transform * BoundTransformMatrix);
if (bHadAnyBounds)
{
NewBounds = NewBounds + InstanceBounds;
}
else
{
NewBounds = InstanceBounds;
bHadAnyBounds = true;
}
}
}
}
return bHadAnyBounds ? NewBounds : FBoxSphereBounds(BoundTransform.GetLocation(), FVector::ZeroVector, 0.f);
}
FBoxSphereBounds UPaperTerrainComponent::CalcBounds(const FTransform& LocalToWorld) const
{
// Determine the rendering bounds
FBoxSphereBounds LocalRenderBounds;
{
FBox BoundingBox(ForceInit);
for (const FPaperTerrainSpriteGeometry& DrawCall : GeneratedSpriteGeometry)
{
for (const FSpriteDrawCallRecord& Record : DrawCall.Records)
{
for (const FVector4& VertXYUV : Record.RenderVerts)
{
const FVector Vert((PaperAxisX * VertXYUV.X) + (PaperAxisY * VertXYUV.Y));
BoundingBox += Vert;
}
}
}
// Make the whole thing a single unit 'deep'
const FVector HalfThicknessVector = 0.5f * PaperAxisZ;
BoundingBox.Min -= HalfThicknessVector;
BoundingBox.Max += HalfThicknessVector;
LocalRenderBounds = FBoxSphereBounds(BoundingBox);
}
// Graphics bounds.
FBoxSphereBounds NewBounds = LocalRenderBounds.TransformBy(LocalToWorld);
// Add bounds of collision geometry (if present).
if (CachedBodySetup != nullptr)
{
const FBox AggGeomBox = CachedBodySetup->AggGeom.CalcAABB(LocalToWorld);
if (AggGeomBox.IsValid)
{
NewBounds = Union(NewBounds, FBoxSphereBounds(AggGeomBox));
}
}
// Apply bounds scale
NewBounds.BoxExtent *= BoundsScale;
NewBounds.SphereRadius *= BoundsScale;
return NewBounds;
}
