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Fix T100119: Cycles light object's parametric vector distorted 

Caused by 38af5b0501.

Adjust barycentric coordinates used for intersection result in the
ray-to-rectangle intersection check.

Differential Revision: https://developer.blender.org/D15592
This commit is contained in:
Sergey Sharybin 2022-08-01 16:07:10 +02:00 committed by Brecht Van Lommel
parent 7b0bc1573b
commit cefd6140f3
Notes: blender-bot 2023-02-14 19:45:25 +01:00 
Referenced by commit 1b216fc237, Fix T100814: Cycles wrong area light parametric texture coordinates
Referenced by issue #100299, Parametric doesn't generate UV correctly with area lights in 3.3 beta
Referenced by issue #100119, Regression: Light object's parametric vector distorted in blender 3.4
1 changed files with 5 additions and 2 deletions
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7
intern/cycles/util/math_intersect.h
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@ -209,10 +209,13 @@ ccl_device bool ray_quad_intersect(float3 ray_P,
*isect_P = hit;
if (isect_t != NULL)
*isect_t = t;
/* NOTE: Return barycentric coordinates in the same notation as Embree and OptiX. */
if (isect_u != NULL)
*isect_u = u + 0.5f;
*isect_u = v + 0.5f;
if (isect_v != NULL)
*isect_v = v + 0.5f;
*isect_v = -u - v;
return true;
}