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Branched Path Tracing provides AA samples and multiplier samples for different rays: diffuse, glossy, etc. So Total sampling for each ray is defined as AA*multiplier.

But what is renderlayer's Override samples in this case? Does it override AA samples only or Total sample number?

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The Render Layer 'Override' setting overrides the AA samples.

For example, setting the render layer override to 300 while having Diffuse branched path tracing samples set to 5 will result in 1500 Diffuse samples.

One interesting point to note is how the override interacts with the Square Samples setting as it overrides before the squaring takes place - so setting Override to, say, 300 with Square Samples enabled will be equivalent to setting to 90000 without squaring enabled.

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