rgen shader looks like a compute shader on gl_LaunchIDNV-indexed grid for me. Can I use NV_compute_shader_derivatives extension along with VK_NV_ray_tracing extension to get derivatives? I want to sample primary albedo in rchit shader using sampler with VkSamplerCreateInfo.anisotropyEnable = VK_TRUE and VkSamplerCreateInfo.maxAnisotropy = e.g. 16, is it possible? I always can use textureGrad to sample textures on any path trace depth with anisotropic filtering, but it would be nice if I can automate this using ready to use mechanisms (in rgen just for primary rays).