The parameters in this rollout adjust V-Ray's rendering regions (sometimes referred to as buckets). A bucket is a rectangular (usually square) section of the currently rendered frame that is rendered independently from other sections. The bucket is an essential part of the V-Ray distributed rendering system. Individual buckets can be sent to idle LAN machines for processing and/or can be distributed between several CPUs on the local machine. Because a bucket can be processed only by a single processor, the division of the frame in too few buckets can prevent the optimal utilization of computational resources (some CPUs stay idle all the time). However, the division of the frame into too many buckets can slow down the rendering because there is some time overhead related to each bucket (bucket setup, LAN transfer, etc). To handle this problem, V-Ray 3.0 now dynamically reduces the size of the buckets when small parts of the image remain to be rendered. UI Path: ||Render Settings window|| > VRay tab > Render region division rollout (When Bucket Image Sampler is Selected)
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