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Cycles: Fix bug calculating dP for perspective camera

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Was introduced by recent optimization. Not really sure derivatives are
intended to work like this, but better to stick to what Dalai had
originally for now.
This commit is contained in:
Sergey Sharybin 2016-03-11 14:43:41 +05:00
parent ebe306b8d2
commit e7eb91365b
1 changed files with 3 additions and 1 deletions
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4
intern/cycles/kernel/kernel_camera.h
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@ -115,11 +115,13 @@ ccl_device void camera_sample_perspective(KernelGlobals *kg, float raster_x, flo
/* ray differential */
ray->dP = differential3_zero();
float3 Pdiff = spherical_stereo_position(kg, tD, Pcamera);
tP = transform_perspective(&rastertocamera, make_float3(raster_x + 1.0f, raster_y, 0.0f));
tD = transform_direction(&cameratoworld, tP);
Pcamera = spherical_stereo_position(kg, tD, tP);
ray->dD.dx = normalize(spherical_stereo_direction(kg, tD, tP, Pcamera)) - ray->D;
ray->dP.dx = Pcamera - ray->P;
ray->dP.dx = Pcamera - Pdiff;
tP = transform_perspective(&rastertocamera, make_float3(raster_x, raster_y + 1.0f, 0.0f));
tD = transform_direction(&cameratoworld, tP);