This page gives information on the Light Select Render Element.
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For this example, the Dome Light is assigned two VRayLightSelect render elements: The first element's Mode is set to Direct diffuse, and the second element's Mode is set to Direct specular. This gives a finer degree of control to allow separate tuning of the light's diffuse and specular contributions. In addition, the light is rendered with a third VRayLightSelect element with the Mode set to Full.
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VRayLightSelect is useful for editing the lights in a scene using a compositing or editing program. See the Beauty element before and after compositing.
The following diagram shows the compositing formula to recreate all the scene's Lighting from light sources when each light in the scene is accounted for in exactly one VRayLightSelect render element in Direct diffuse mode.
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The diagram above illustrates that the sum of all VRayLightSelect Render Element set to Direct diffuse mode represents the VRayLighting render element which can be used in the Back to Beauty composite. For the above equation to work correctly, all enabled lights need to be accounted exactly once in the VRayLightSelect render elements. This happens with either specifying each light in a separate element, or combining them in a practical manner in several elements and avoiding repetitions.
When the VRayLightSelect render element is set to Direct diffuse mode, the sum of all lights' output composes the VRayLighting render element. It must be noted that VRayAlSurfaceMtl with sss_mix value other than the default 0, doesn't fit this equation.
When the VRayLightSelect render element is set to Direct raw mode, the sum of all lights' output composes the VRayRawLighting render element. This is only true when GI is disabled and there are no dome lights in use.
When the VRayLightSelect render element is set to Direct specular mode, the sum of all lights' output composes the VRaySpecular render element.
When the VRayLightSelect render element is set to Direct illumination mode, the sum of all lights' output replaces the sum of VRayLighting and VRaySpecular render elements in the Back to Beauty composite.
When the VRayLightSelect render element is set to Full mode, the sum of all lights' output composes the Beauty pass. This is only true when the environment is black and no environment override is used. Caustics are not included in the calculation of VRayLightSelect Render Element.
When the VRayLightSelect render element is set to Indirect mode, its output equals the sum of VRayLightSelect render element set to Indirect diffuse mode and VRayLightSelect set to Indirect specular mode.
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