jim-ec
commented
5 months ago According to the spec, the viewer does a counter-clockwise rotation around the X-axis (using a right-handed coordinate system).
Also, all the following viewers perform the exact same animation:
So the current behavior should be correct.
have had a discussion in the sample repository about the sample BoxAnimation. It should be a rotation counter clockwise as shown in their gif animation but the glTF smaple viewer renders the animated quat wrong.
The first quat is (0,0,0,-1) wich is a 360 degree rotated object. You might say that this is a unit transform but the argument is 180 degrees of the quat.
The second quat is (1,0,0,0) wich is a 180 degrees rotated object. The quat has argument 90 degrees.
A slerp between these quats will be a counter clockwise rotation around x axis from 360 degrees to 180 degrees.
BUT the sample viewer shows a clockwise rotation ?