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neilmendoza/gist:4512992

Last active June 9, 2023 14:22
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Function to return matrix for rotation about an arbitrary axis in GLSL.
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gistfile1.txt
mat4 rotationMatrix(vec3 axis, float angle)
{
axis = normalize(axis);
float s = sin(angle);
float c = cos(angle);
float oc = 1.0 - c;
return mat4(oc * axis.x * axis.x + c, oc * axis.x * axis.y - axis.z * s, oc * axis.z * axis.x + axis.y * s, 0.0,
oc * axis.x * axis.y + axis.z * s, oc * axis.y * axis.y + c, oc * axis.y * axis.z - axis.x * s, 0.0,
oc * axis.z * axis.x - axis.y * s, oc * axis.y * axis.z + axis.x * s, oc * axis.z * axis.z + c, 0.0,
0.0, 0.0, 0.0, 1.0);
}
@johnnyshankman
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johnnyshankman commented Jun 8, 2023 •
edited
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bless for this, where does the math for this come from? ie any references?

i'm used to seeing three separate operations each using their own mat3 for rotation on each axis. this is awesome that it's all in one.

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