[cairo] Rotations with Quaternions

cecashon at aol.com cecashon at aol.com
Mon Jan 22 23:41:25 UTC 2018

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


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.


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