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Volume file formats, such as OpenVDB, will allow storage of much larger datasets while being optimized for random access to volume data, which is more efficient for rendering. OpenVDB is an open source C++ library comprising a novel hierarchical data structure and a suite of tools for the efficient storage and manipulation of sparse volumetric data discretized on three-dimensional grids.

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Tutorials about working with volumes can be found here.

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  • The Volume object is available in the Create tab, Geometry category, and Arnold grouping (along with the Procedural and Alembic objects):

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The timeline's frame at which the VDB sequence ends to be used.
If there are not enough files in the sequence to cover the Animation Start-End range, the sequence can be repeated, either from its start or in ping-pong mode.

 


Replay Speed

Sets the playback speed of the volume's animation.

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If you need to further edit the result of the reading of a channel, for instance, to color correct it, there are the Volume Sample RGB and Volume Sample Float shaders.

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Reducing Noise

To reduce the amount of noise in a volume, you must ensure that any lights in your scene have sufficient volume samples, or that you have enough AA samples.

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MultiExcerptNameVolumes and Atmosphere Volume
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PageWithExcerptA5AFMUG:Volumes

 

 



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Further examples

Smoke volume by Mads Droschler

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