V-Ray supports per object control of motion blur, indirect illumination, and shadow/matte properties. On the left is a list of all objects in the scene and on the right are the properties. You can select multiple objects. If there are any 3ds Max selection sets in the scene, they appear in a list to make the interface more convenient and efficient.
Use default moblur samples – When enabled, the Geometry Samples value is taken from the global Motion blur rollout. When disabled, the number of geometry samples is taken from the Motion blur samples parameter below.
Motion blur samples – Sets the number of geometry samples for the selected objects, if Use default moblur samples is off. See the Motion Blur Samples example below.
Moblur duration – When enabled, allows you to control the strength of the motion blur effect on a per object basis. Larger values mean that the camera shutter is open for a longer time and smaller values mean the camera shutter is opened for a shorter time.
Velocity channel – Allows you to manually specify a map channel to be used as a velocity channel
Velocity chan mult – Allows you to control the velocity information on a per-object basis by multiplying the original velocity with the value specified here.
Generate GI– Controls whether the object(s) generates indirect illumination. You can supply a multiplier for the generated indirect illumination.
Receive GI – Controls whether the object(s) receives indirect illumination. You can supply a multiplier for the received indirect illumination.
GI surface ID – Prevents the blending of light cache samples across different surfaces. If two objects have different GI surface IDs, the light cache samples of the two objects will not be blended. This can be useful to prevent light leaks between objects of vastly different illumination.
Raytraced SSS ID – Used to tell VRayFastSSS2 that objects with the same ID need to share the same illumination samples when using raytraced multiple scattering. This avoids illumination seams between those objects.
Subdivs multiplier – A multiplier for the subdivisions of all secondary ray tracing done for the particular surface.
Generate caustics – When enabled, the selected objects refract the light coming from light sources that are caustics generators, so that caustics are produced. Note that in order to generate caustics, an object must have a reflective or refractive material.
Receive caustics – When enabled, the selected objects become caustic receivers. When light is refracted by objects that generate caustics the resulting caustics are only visible when they are projected on caustics receivers.
Caustics multiplier – A multiplier for the caustics received by the selected object(s). Note that this value has no effect unless Receive caustics is checked. See the Caustics Multiplier of an Object example below.
Visible in reflections – When disabled, the object appears perfectly transparent to reflection rays. See the Visibility example below.
Visible in refractions– When disabled, the object appears perfectly transparent to refraction rays. See the Visibility example below.
Gen render elements – When disabled, the object does not appear in some render elements. The full list of the render elements affected is listed below.
VRayToon outlines – Allows you to explicitly exclude an object from VRayToon. This parameter is ignored in V-Ray GPU.
LPE labels – Allows you to add an object labels for the object in order to use Light Path Expressions. See the Light Path Expressions page for more information.
Geometry – Allows you to override the Default Geometry parameter in the System rollout on a per object level.
Static – The geometry is pre-compiled into an acceleration structure at the beginning of the rendering and remains there until the end of the frame. The static raycasters are not limited in any way and consume as much memory as necessary. Dynamic – The geometry is loaded and unloaded on the fly depending on which part of the scene is being rendered. The total memory taken up by the dynamic raycasters can be controlled by the Dynamic memory limit parameter. Default – The option set in the Default Geometry parameter is used.
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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. If there are any 3ds Max selection sets in the scene, they appear in a list to make the interface more convenient and efficient.
Generate caustics – When enabled, V-Ray generates 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.
Caustic subdivs – Controls the amount of photons that V-Ray traces to estimate caustics. Large numbers slow down the calculation of the caustics photon map and may take more memory.
Caustics multiplier – A multiplier for the generated caustics by the selected object. Note that this multiplier is cumulative - it does not override the multiplier in the Caustics render rollout section. The multiplier has no effect unless Generate caustics is checked. See the Caustics Multiplier example below.
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The options here allow you to control the motion blur generated by the camera movement.
Use default moblur samples – When enabled, the Geometry Samples value is taken from the global Motion blur rollout. When disabled, the number of geometry samples is taken from the Motion blur samples parameter below.
Motion blur samples – Sets the number of geometry samples for the selected objects if Use default moblur samples is off.
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Objects with Gen render element unchecked 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.
Since V-Ray 6 the Generate diffuse, Diffuse subdivs and Diffuse multiplier options have been removed from the UI.
In V-Ray 5, matte objects always show the background. Since V-Ray 6, however, the matte objects show the V-Ray Dome light instead of the background when a V-Ray Dome light is present in the scene.
