Update the Glass BSDF to internally use Generalized Schlick fresnel.
This allows for easier expansion of certain features in the future.
There should be no functional change from the users perspective.
Pull Request: https://projects.blender.org/blender/blender/pulls/112701
Speckles and missing lights were experienced in scenes with Nishita Sky
Texture and a Sun Size smaller than 1.5°, such as in Lone Monk and Attic
scenes.
We previously worked around these by using a more precise
software implementation of cosine.
After recent changes in Cycles, it turns out this workaround isn't
currently needed.
The solid angle computation for the sampling/PDF code was running into
cancellation issues for small solid angles.
Reformulating the terms using asin() instead avoids this.
<algorithm> header include is missing from some sycl headers, this will
be fixed upstream with https://github.com/intel/llvm/pull/10424,
meanwhile, we work around it by including it directly.
The sampling pattern is only a debug setting at this point
and should not be used without the debug UI enabled where
users can actually see and edit the value.
Pull Request: https://projects.blender.org/blender/blender/pulls/112606
This PR fixes T39823, the sole failing unit test when running with MetalRT. It does so by implementing and binding a missing intersection handler (`__anyhit__cycles_metalrt_volume_test_tri`) which is required for `scene_intersect_volume` (as used by `integrator_volume_stack_update_for_subsurface`) to work as intended. This scene exposed the error as it uses subsurface scattering on a sphere which is intersected by volume.
Pull Request: https://projects.blender.org/blender/blender/pulls/112876
This patch adds `BVHMetalBuildThrottler` which limits the amount of Metal BVH building work that runs concurrently on the GPU. Previously we submitted BVH build requests to the GPU as fast as possible, but in extreme cases this could fail when the device's working set size passes safe limits.
Pull Request: https://projects.blender.org/blender/blender/pulls/112821
This keeps the behavior similar to the Disney BRDF, where 0.5
is neutral and lower/higher values respectively decrease/increase
the dielectric specular. But it's more correct in that it's not
an arbitrary scale on Fresnel, but rather adjusting the IOR.
Ref #99447
Ref #112848
Pull Request: https://projects.blender.org/blender/blender/pulls/112552
This patch fixes the memory leak described in #107714 by adding an `@autoreleasepool` around Metal BVH builds. Certain NSObjects were being retained indefinitely, specifically ones which had been value-passed via an NSArray into acceleration structure descriptors.
Pull Request: https://projects.blender.org/blender/blender/pulls/112820
