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Advanced control over the shading is provided with the PhoenixFDTexture which can be used to drive the properties of a V-Ray material applied to a liquid surfacethe Phoenix mesh or isosurface. For Volumetric rendering, Phoenix FD provides you with the ability to drive the color and opacity of Fire / Smoke simulations through any of the supported channels (such as Smoke, Speed, RGB, etc.), as long as they are present in the cache files.

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If using a Cutter GeometryGeom for a liquid pouring into a glass or otherwise contained into another refractive object, you may need to set the Mode to Isosurface.  By default, the mode is set to Mesh which may produce artifacts in the rendered image.

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Texture - the values of a custom texture will define the liquid mesh surface. You can see how this works in this How-to video.
Liquid/Temperature - the Liquid/Temperature channel will define the liquid surface. Temperature is typically in the range 0-1 for Liquid simulations and 600-2000 for Fire / Smoke simulations.
Smoke - the Smoke channel will define the liquid surface. Smoke is typically in the range of 0-1 for Fire / Smoke simulations.
Speed - the Speed channel will define the liquid surface. Speed channel output has to be enabled for this to work. Speed is calculated as the length of the velocity vector for each voxel.  
Fuel - the Fuel channel will define the liquid surface. Fuel channel output has to be enabled for this to work. 

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