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Callable shaders are similar to hit shaders, but they can be invoked from RayGen shaders without tracing any rays. They have records in the shader binding table and allow local parameters to be bound. The total number of callable shader slots/records must be declared when creating a ray tracing scene. Each record must be filled using SetRayTracingCallableShader() command, which is similar to SetRayTracingHitGroup(). #jira UE-69988 #rb Juan.Canada [CL 6078802 by Yuriy ODonnell in Dev-Rendering branch]