forked from bartvdbraak/blender
cycles-fisheye: fixed formula for dir to equisolid
second time I need a scond commit to get the equisolid formula right, shame on me ;) the formula is: r = 2 x focallength x sin (theta / 2)
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@ -112,7 +112,7 @@ __device float3 fisheye_to_direction(float u, float v, float fov)
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__device float2 direction_to_fisheye_equisolid(float3 dir, float lens, float width, float height)
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{
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float theta = acosf(dir.x);
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float r = 2.0f * lens * sinf(theta * 0.25f);
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float r = 2.0f * lens * sinf(theta * 0.5f);
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float phi = atan2f(dir.z, dir.y);
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float u = r * cosf(phi) / width + 0.5f;
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