General

Automatic instancing detection

Manually specifying if an object should be instanced or not

Forest Pro support

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General

V-Ray RT 2.40 supports true instancing both on the CPU and the GPU. This allows objects which have the same geometry to be stored just once in memory, thus reducing memory requirements and also speeding up interaction with the scene. This is especially useful on the GPU, where the video RAM is more limited.

 

Note however, that raytracing instanced geometry is somewhat slower than raytracing the same geometry without instancing. Still, it can make the difference between being able to render a scene, and not being able to render it at all, especially on the GPU.

 

V-Ray RT allows several different ways to specify which objects in the scene should use instancing.

Automatic instancing detection

By default, V-Ray RT will attempt to turn on true instancing for any object which has more than one instance in the 3ds Max scene and when the total number of triangles for all instances is above 50,000 triangles. Objects instanced through the Forest Pro plugin are also always rendered as instances.

Manually specifying if an object should be instanced or not

You can also manually mark objects to be rendered as instances or not through the Geometry property in the V-Ray Object Properties dialog, similar to the regular V-Ray renderer:

 

 

When the value is Static, an object will never be instanced (its geometry will always be replicated). When the value is Dynamic, the object will always be instanced. When the value is Default, V-Ray RT will attempt to decide automatically whether to instance an object or not as described above.

 

When different nodes in the 3ds Max scene are instances of the same object but have different values for the Geometry property, the result is undefined - the object may be instanced or not, depending on which particular node is exported first by V-Ray RT.

Forest Pro support

V-Ray RT 2.40 also supports instancing through the Forest Pro plugin by Itoo Software. Support for the MultiScatter plugin by iCube is also planned.

 

You need Forest Pro 4.0.1b or later for this feature to work.

 

V-Ray RT will always treat objects instanced through the Forest Pro plugin as true instances.

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