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Q: When we have the interactive renderer on, and we try to turn off
the DrawContext's clearImageMethod to kQ3ClearMethodNone, it still clears. This works properly
with the wire-frame renderer, but we need this feature in the interactive renderer, as we are
pasting in background pictures that we want to act as a backdrop to our 3D models, and the interactive
renderer always obliterates the picture with the clearImageColor.
A: This is a renderer-dependent feature that is supported by the
wire-frame renderer, but not the Interactive renderer. We intend to provide a "Clear with
picture" method in the next major release of QuickDraw 3D.
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