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fix: Fix MToon UV rotation direction #1076

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Oct 11, 2022
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fix: Fix MToon UV rotation direction #1076

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2 changes: 1 addition & 1 deletion packages/three-vrm-materials-mtoon/src/shaders/mtoon.frag
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Original file line number Diff line number Diff line change
Expand Up @@ -331,7 +331,7 @@ void main() {
uv = uv + vec2( uvAnimationScrollXOffset, uvAnimationScrollYOffset ) * uvAnimMask;
float uvRotCos = cos( uvAnimationRotationPhase * uvAnimMask );
float uvRotSin = sin( uvAnimationRotationPhase * uvAnimMask );
uv = mat2( uvRotCos, uvRotSin, -uvRotSin, uvRotCos ) * ( uv - 0.5 ) + 0.5;
uv = mat2( uvRotCos, -uvRotSin, uvRotSin, uvRotCos ) * ( uv - 0.5 ) + 0.5;
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memo

$$ R(\theta) \rightarrow R(-\theta) $$

$$ R(-\theta) = \begin{bmatrix} cos( -\theta) & sin(-\theta) \\ -sin(-\theta) & cos(-\theta) \\ \end{bmatrix} = \begin{bmatrix} cos( \theta) & - sin(\theta) \\ sin(\theta) & cos(\theta) \\ \end{bmatrix} $$

つまり回転が逆になりました

#endif

#ifdef DEBUG_UV
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