Subdivs – This parameter is disabled by default since most users will not need local control of subdivs, however 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. Note that the actual number of samples also depends on the Sampler settings. By default, this parameter is controlled by the Min Shading Rate in the image sampler. This parameter is not available when the renderer is set to CUDA.
To activate this parameter and specify a value,use the Use Local Subdivs parameter under the V-Ray > DMC Sampler tab in the Render Settings window.
Light cutoff threshold – Light cut-off threshold – Specifies a threshold for the light intensity, below which the light will not be 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. Larger values cut away more from the light; lower values make the light range larger. If you specify 0.0, the light will be calculated for all surfaces. This parameter is not available when the renderer is set to CUDA.
Override motion blur samples – Overrides the default number of samples that will be used to sample the current light for motion blur.
Motion blur samples – When Override motion blur samples is enabled, determines the samples the motion blur created by the current light.
Column
width
5%
Column
width
35%
...
Shadows
...
Section
Column
width
60%
Shadows – When enabled (the default), the light casts shadows. Disable to turn off shadow casting for the light. For more information, see the Size of Lights, Shadows and Intensity example earlier in this page.
Shadow bias – Moves the shadow toward or away from the shadow-casting object (or objects). Higher values move the shadow toward the object(s) while lower values move it away. If this value is too extreme, shadows can "leak" through places they shouldn't or "detach" from an object. Other effects from extreme values include moire patterns, out-of-place dark areas on surfaces, and shadows not appearing at all in the rendering.
Shadow Color – Controls the color of shadows for this light. Note that anything different from black is not physically correct. This option is inactive when using the V-Ray CUDA engine.
