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Dome Tex – Specifies an environment texture for the VRayLightDome object. Note: If an RGBA texture file (a file that contains an alpha channel) is used, the file's alpha output must be connected to the Dome Tex A attribute to utilize the alpha channel it on the light.

Dome Tex A – Specifies an alpha texture for the dome light. Note: The default value of 1 (fully opaque) remains unchanged whenever a file texture is connected to the Dome Tex attribute, even if that file contains an alpha channel. For a file's alpha channel to be utilized, it's alpha output needs to be connected to this attribute.

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Use MIS – Enables of disables Multiple Importance Sampling (MIS) for the light. When MIS is enabled (the default), the light's contribution is split between direct illumination, on the one hand, and GI (for diffuse materials) or reflections (for glossy surfaces) on the other. This means that portions of the light's contribution will end up in the GI render elements (or the reflection render elements respectively). In certain specific situations, this is undesirable and this option can be used to always calculate the light contribution through direct illumination.

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Disabling  Disabling MIS may increase noise, especially in glossy reflections. Please only disable this setting when you have a reason.



 

 
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Example: IBL (Image-Based Lighting)

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