internal static Rect ProjectBounds(
ref Matrix3D viewProjMatrix,
ref Rect3D originalBox)
{
D3DMATRIX viewProjFloatMatrix = CompositionResourceManager.Matrix3DToD3DMATRIX(viewProjMatrix);
MILRect3D originalBoxFloat = new MILRect3D(ref originalBox);
MilRectF outRect = new MilRectF();
HRESULT.Check(
MIL3DCalcProjected2DBounds(
ref viewProjFloatMatrix,
ref originalBoxFloat,
out outRect));
if (outRect.Left == outRect.Right ||
outRect.Top == outRect.Bottom)
{
return Rect.Empty;
}
else
{
return new Rect(
outRect.Left,
outRect.Top,
outRect.Right - outRect.Left,
outRect.Bottom - outRect.Top
);
}
}
private extern static /*HRESULT*/ int MIL3DCalcProjected2DBounds(
ref D3DMATRIX pFullTransform3D,
ref MILRect3D pboxBounds,
out MilRectF prcDestRect);