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• Base Grid: set the name of the base grid inside the VDB file that defines the volumetric domain. Usually this field is called "density". If no name is supplied here, Maxwell uses the first grid present in the file.
• Base Grid density: controls the density of the base grid.
• Additional grids for UV: here you can specify names of other grids usually found in VDB file that describe velocity or temperature, or any other data that was calculated during a simulation (such as particle distance, acceleration etc.). Use a comma to separate the different grid names. These grids can be used to map textures, usually a colored gradient, to better visualize the stored data. For example if the VDB file contains a "temperature" field, this means that the different temperatures of the simulation is stored in the file and you can use it to visualize these different temperatures using a blue to red gradient that uses this field as a driver to create the necessary UV map when rendering. Please see the "Texturing OpenVDB volumetrics" below for more details.
• VEC_MOD 0 to 9 min/max: Lets you redefine the range of the corresponding vector grid, before it is normalized to 0,1 space for UV mapping. VEC_MOD_0 corresponds to the first vector grid found in the file, VEC_MOD_1 to the second one and so on.
• FLOAT 0 to 9 min/max: Lets you redefine the range of the corresponding scalar grid, before it is normalized to 0,1 space for UV mapping. FLOAT_0 corresponds to the first vector grid found in the file, FLOAT_1 to the second one and so on.

Texturing OpenVDB volumetrics

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