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The Sample Rate Render Element displays the work being done by the image sampler as a red, green, and blue image. This render element displays the process while rendering is done and once the render completes.

A color is assigned to each pixel according to how many primary samples are being taken by the Image Sampler:

The way to ensure a render is correctly computed is to minimize the amount of red color in this render element. Raising secondary sampling through any means will reduce the primary sampling work in the corresponding areas, effectively moving red areas into green ones and green ones into blue ones. Lowering secondary samples per pixel will do the opposite, potentially leading to more red areas. The suggested way to minimize the red color and optimize render times is to increase the Max Subdivs value (if the previous render was still noisy) or increase the Noise Threshold value (if the previous render was clean but took too long to complete).

Note that some specific image features, like high-frequency detail often found in fur and hair or high-contrast zones, will likely always try to reach the maximum sampling, so some red will appear there. This is perfectly normal and doesn't slow down the rest of the rendering while ensuring the problematic parts of the image clean up as per the user's settings.

UI Path: ||V-Ray|| > Render Elements > Sample Rate

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