GI – Enables GI. You can specify the number of bounces for the traced GI rays. Reflective GI caustics – Specifies the method how accurate the indirect lighting reflects from specular objects(e.g. mirror, chrome, etc). Off – Disables calculations for indirect lighting reflecting from specular objects. Quick – Fast calculations for indirect lighting reflecting from specular objects that produce sufficient but less accurate results compared to Full(V-Ray) mode. Full(V-Ray) – Accurate calculations for indirect lighting reflecting from specular objects that produces proper reflective caustics with similar to V-Ray results. Enable lights – Enables/disables all the lights in the scene. Environment importance sampling – Environment mode is set to Texture. Light cache – Enables light cache. Reduces GI noise and improves speed of non-primary GI bounces. LC cell size – Specifies the size of a single voxel, in scene units that is used for the Light cache calculations. Low values produce more accurate lighting but impact performance. LC sample limit – Specifies the maximum samples per pixel for refining the image. LC retrace threshold – Specifies the extent to which GI near corners are retraced instead of being read from the light cache. A value of 0.0 disables retracing. Enable lights tree – When enabled, uses the Light tree method to trace the lights rays. You can further set the number of samples. Direct light reservoir (re)sampling – Enables reservoir sampling for direct lighting of camera ray hits (secondary hits still use the light tree). Produces cleaner results but may cause slight darkening in specific areas. Applies only to non-infinite light sources. Resampling – Enables resampling of reservoir from the previous frame and the nearby pixels. Off – Resampling is off. Always – Provides best sampling but may slightly bias (darken) the result. First pass – Very helpful in interactive mode. Enable spatial importance – Direct light sampling for surfaces near the camera (up to ~70m) prioritizes light sources that could contribute more for that surface. Disable this option only if it causes unusual noise or 'boiling' artifacts. Spatial samples – More samples may stabilize the result a bit more in complex scenes, but reduce speed. If uncertain, use the default value of 1. Clamp secondary rays – Suppresses the contribution of very bright secondary(GI/reflection/refraction) rays, which may typically cause excessive noise (fireflies). When enabled, the scene may turn out to be darker than the actual correct result. |