Smooth VUEs amendment#600
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…e is transiting across 0 / 360 degrees between frames For example, if changing from 358 degrees to 2 degrees, we want to interpolate upwards (358, 359, 0, 1, 2) not downwards
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NB. I ran this past @kevinfoley on discord (he wrote the original VUE smoothing code) and he said he was ok with it. |
ifeldshteyn
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Jul 9, 2026
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This looks good - I talked to Kevin and I understand the issue this is trying to solve.
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The existing interpolation logic (introduced by #288) does not take into account the wrapping-around of angles at 360 degrees.
So, if an angle (eg. yaw) is 358 degrees in one frame and 2 degrees in the next frame, the interpolation will happen downwards from 358 to 2, instead of upwards (358, 359, 0, 1, 2).
This is not an issue with 3d-object VUEs, which ignore the angles and use the transformation matrix to render each keyframe. But it is noticed when using VUEs in camera mode, to move a camera or sprite around.
I think the solution to this is to test whether the delta is more than 180 degrees -- if so, interpolate via the shorter distance arc