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The Active Bodies simulation currently supports interaction between scene geometry and the Phoenix FD Liquid Simulator. When an object is selected as an Active Body, the simulation both influences and is influenced by the Active Body's movement. Mutual interaction between the Active Bodies themselves is not supported yet. Interaction between Active Bodies and the Phoenix FD Fire/Smoke Simulator is not supported.

For in-depth information on Active Bodies, please check the Active Bodies Setup Guide.

The main purpose of the Texture UVW feature is to provide dynamic UVW coordinates for texture mapping that follow the simulation.

This is achieved by simulating an additional Texture UVW Grid Channel which has to be enabled under the Output roll-out for the settings below to have any effect.

The Texture UVW channel values represent the UVW coordinates of each Cell in the Simulator, with a range of [ 0 - 1 ]. The channel is initialized when a simulation is started depending on the position of the emitting object in the Simulator's bounding box. If Grid roll-out → Adaptive Grid is enabled, the Texture UVW coordinates in expanded voxels beyond the initial grid will be greater than one if the grid is expanding in a positive direction (+X, +Y, +Z), and less than zero otherwise. This means that textures assigned to simulations using the Adaptive Grid feature will be automatically tiled/repeated as many times as the final size of the Simulator is larger than its initial size.

The custom UVW texture coordinates can be used for advanced render-time effects, such as recoloring of mixing fluids, modifying the opacity or fire intensity with a naturally moving texture, or natural movement of displacement over fire/smoke and liquid surfaces. Some examples uses are:

• Increasing the detail of Fire/Smoke simulations at render time by adding displacement which moves along with the fluid.
• Increasing the detail of Fire/Smoke simulations at render time by modulating the opacity of the smoke, the smoke color, or the fire color and intensity with noise maps which move along with the fluid.
• Re-coloring of Fire/Smoke or Liquid simulations at render time, after the simulation is complete.
• Transporting images or texture color details with Fire/Smoke or Liquid simulations.

Note that emission of TexUVW values from a Phoenix FD Source is not supported yet.

Example: Interpolation

Example: Interpolation Step