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Hi Bill,
I took a look at your drawings of the checker pattern. They can be drawn with 3d rotations using quaternions. The rotations use a cairo transform so the drawing doesn't change how fonts are drawn. Nothing is changed internally in Cairo.
If you get a chance could you take a look at the following
https://github.com/cecashon/OrderedSetVelociRaptor/blob/master/Misc/cairo_drawings/rotation2.c
I have had some trouble getting the rotations to follow the "aircraft" spec but it is more a matter of how the axis are labelled for that. The drawing has a few squares that are rotated and their perspective changes along with the rotation. Similar to your checker board drawings.
Appreciate any comments.
Eric
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