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Cycles: Simplify perspective camera derivatives calculation

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Probably some further simplification is possible, will look into this later.
Alternatively will get rid of KernelCamera.{dx, dy}.
This commit is contained in:
Sergey Sharybin
2016-03-10 21:47:44 +05:00
parent 033b0789c8
commit 59a7204797
1 changed files with 2 additions and 5 deletions
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7
intern/cycles/kernel/kernel_camera.h
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@@ -115,16 +115,13 @@ ccl_device void camera_sample_perspective(KernelGlobals *kg, float raster_x, flo
/* ray differential */
ray->dP = differential3_zero();
tP = transform_perspective(&rastertocamera, make_float3(raster_x, raster_y, 0.0f));
tD = transform_direction(&cameratoworld, tP);
float3 Pdiff = spherical_stereo_position(kg, tD, tP);
float3 Ddiff = normalize(spherical_stereo_direction(kg, tD, tP, Pdiff));
const float3 Ddiff = normalize(ray->D);
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)) - Ddiff;
ray->dP.dx = Pcamera - Pdiff;
ray->dP.dx = Pcamera - ray->P;
tP = transform_perspective(&rastertocamera, make_float3(raster_x, raster_y + 1.0f, 0.0f));
tD = transform_direction(&cameratoworld, tP);