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Subdivs – The Subdivs parameter is disabled by default, since most users do not need local control of subdivs. This parameter controls the number of samples V-Ray takes to compute lighting locally for this light. Lower values create more noise but render faster. Higher values produce smoother results but take more time to render. This parameter is not available when the renderer is set to GPU.

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To activate this parameter and specify a value, use the Use local subdivs parameter under the V-Ray tab > Global DMC rollout in the Render Setup window. Note that the actual number of samples also depends on the Global DMC Settings. By default, this parameter is controlled by the Min samples parameter in the Advanced user mode of the Global DMC rollout.

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Cutoff – Specifies a threshold for the light's intensity, cutting off the light's effect on a surface when it falls below this value. Lights lose intensity due to GI bouncing or decay. When light hits a surface but its intensity falls below the cutoff, the effect of the light on that surface is not computed. This can be useful in scenes with many lights, where you want to limit the effect of the lights to some distance around them or reduce computations (and thus reduce rendering time) where the light's impact is negligible. Larger values limit the light's effect on objects to a smaller area around the light source, while lower values increase the range of the light's effect. If you specify 0.0, there is no cutoff and the light is calculated for all surfaces regardless of intensity loss. The default value is 0.001. This parameter is not available when the renderer is set to GPU.

 

Parameters -  Viewport Rollout

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