Using Open VDB assets with 3Delight for Maya involve using a Maya shape and a shading node. The 3Delight Open VDB shape allows specifying what VDB file will be used and positions the VDB volume in the scene. The shading attributes are specified in an assigned volumetric shader, such as the 3Delight Open VDB Shader.
Specifying an Open VDB file
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It is also possible to drive the Filename attribute value with another node or expression connected upstream; in that case the File Sequence options, if needed, must be set manually.
Once a VDB file has been set, 3Delight for Maya will automatically attempt to select proper Smoke, Temperature, Emission Intensity and Velocity grids. The Velocity Scale attribute will be used as a multiplier over the Velocity grid values.
Using an Open VDB File Sequence
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The VDB file sequence can be played in loop by setting Outside Range to Repeat Sequence. When this is selected, the Start Offset can be used to start the repeatable sequence on another index than the first one.
While Use File Sequence is enabled, the VDB file that is being used at the current frame will be shown under the Filename attribute.
When Use File Sequence is turned off, the current frame number will be used to replace a number expression in the VDB file name, such as #### or <f>.
Showing the Open VDB volume in the viewport
By default, the VDB volume is drawn as a box in the viewport. It can be drawn as a point cloud by enabling the Draw Points option under Object Display.
Shading the Open VDB Volume
Shading an Open VDB volume is done by the volume shader assigned to the 3Delight Open VDB shape. By default, these shapes are created with a 3Delight Open VDB Shader is assigned to them.
