internal GeneralTransform2DTo3D(GeneralTransform transform2D,
Viewport2DVisual3D containingVisual3D,
GeneralTransform3D transform3D)
{
Visual child = containingVisual3D.Visual;
Debug.Assert(child != null, "Going from 2D to 3D containingVisual3D.Visual should not be null");
_transform3D = (GeneralTransform3D)transform3D.GetCurrentValueAsFrozen();
// we also need to go one more level up to handle a transform being placed
// on the Viewport2DVisual3D's child
GeneralTransformGroup transformGroup = new GeneralTransformGroup();
transformGroup.Children.Add((GeneralTransform)transform2D.GetCurrentValueAsFrozen());
transformGroup.Children.Add((GeneralTransform)child.TransformToOuterSpace().GetCurrentValueAsFrozen());
transformGroup.Freeze();
_transform2D = transformGroup;
_positions = containingVisual3D.InternalPositionsCache;
_textureCoords = containingVisual3D.InternalTextureCoordinatesCache;
_triIndices = containingVisual3D.InternalTriangleIndicesCache;
_childBounds = child.CalculateSubgraphRenderBoundsOuterSpace();
}
