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Heat Haze | heathaze, hhfactor – Traces the ray changing direction according to the gradient of the Surface channel. A value of 1 corresponds approximately to the normal heat haze in the air caused by the temperature. If smoke or another channel is selected as the source, a larger value might be necessary to achieve a visible result. A value of 0 produces no heat haze. This parameter is available only when Mode is set to Volumetric Heat Haze. See the Heat Haze example below.

Sampler type | sampler – Determines Type | sampler – Determines the blending method between adjacent grid cellsvoxels. Used to balance between rendering speed and quality. This parameter is used when Mode is set to Volumetric, Volumetric Geometry, Volumetric Heat Haze and Isosurface modes.

Box –  – Displays cells voxels as cubes. There is no blending between neighbor cellsvoxels. This is the fastest mode.
Linear –  – Linear blending occurs between neighbor cells voxels to smooth out the fluid's look. Sometimes this mode may unveil the grid-like structure of the fluid. Up to 20-30% faster than the the Spherical option option.
Spherical – Uses  – Uses special weight-based sampling for the smoothest looking fluid. With increasing resolution, the visual advantage of this method over the Linear method becomes less noticeable.

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