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In addition to the settings in the Render dialogue, which are global for the scene, you can set different render settings on a per-object basis. Some of those properties (primary and secondary visibility, visibility to camera, etc.) are accessible through the normal 3ds Max object properties page. V-Ray also defines some additional properties which can be accessed by pressing the Object settings or Light settings button in the System roll-out of Render Setup in the Settings tab.

 

UI Paths

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||Select object|| > right click in viewport > V-Ray properties

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||Render Setup window|| > Settings tab > System rollout >
Object settings...
/ Lights settings... Cameras settings... button

 

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V-Ray does not completely support the Matte/Shadow material of 3ds Max. However, V-Ray has its own matte system. You can control matte properties either on an object level through the Object settings dialog, or on a material level through the special VRayMtlWrapper materialspecial VRayMtlWrapper material.

Matte object – When enabled, turns the object into a matte object. This means that the object will not be directly visible in the scene; instead, the background color will be shown in its place. However, the object will appear normally in reflections/refractions and will generate indirect illumination based on its actual material.

Matte for refl/refr – When enabled, this option makes the object a matte object when viewed through reflections or refractions. This means that whenever the object is reflected or refracted, the background color will be shown instead of the object color.

Alpha contribution – Allows the user to control how the object will appear in the alpha channel. Note that this parameter does not require the object to be a matte object - this parameter has an effect on all objects. A value of 1.0 means that the object will appear normally in the alpha channel. A value of 0.0 means that the object will not be present in the alpha channel at all. A value of -1.0 will invert the alpha of the object. Note that turning an object into a matte object does not change its appearance in the alpha channel. You need to explicitly change its alpha contribution.

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In this dialogue, you can specify properties of the lights in the scene with regards to caustics and global photon mapping. On the left is a list of light sources in the scenes and on the right are the light settings. You can select multiple light sources. There is also a list of 3ds Max selection sets to make the interface more convenient and efficient.

 

 

 

Generate caustics – When enabled, V-Ray will generate caustic photons for the selected light sources. Note that to obtain the caustics effect you must set the appropriate value for the Caustics multiplier below as well as put some objects that generate caustics in the scene.

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  • Objects with Gen render element unchecked will still appear in the Z-Depth pass, but with constant Z-Depth of 1.0
  • When creating a matte object with Object and Light Properties and using the V-Ray CUDA engine, please note the following:

    • Alpha Contribution should be set to -1.0;
    • The Matte Surface, Affect Alpha and Shadows options should be enabled.