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There are many places in Phoenix where you can insert a texture and affect the simulation or rendering of fluids - fire/smoke or liquids:
- Shading of Fire Color, Fire Opacity, Smoke Color or Smoke Opacity, when the Simulator is in Volumetric, Volumetric Geometry or Heat Haze mode.
- When the Simulator is in Mesh, Ocean Mesh, Cap Mesh or Isosurface render mode, materials can be applied to it and they could contain textures for colors or opacity of the surface or the volume of the Simulator mesh.
- The Particle Shader can be colored with a texture and also textures can be used for mapping the reflections or environment of bubbles.
- The fire/smoke volumes and the meshes that Phoenix produces can be displaced by Phoenix using a texture. The difference between Phoenix displacement of meshes and using V-Ray Displacement is that Phoenix shows the displaced mesh in the viewport.
- All grid channels and particles that Phoenix Sources emit can be mapped with a texture to create more diverse and interesting simulation.
- Voxel Tuner and Particle Tuner expressions can depend on textures.
- The Mapper helper reads values from textures and changes the simulation data.
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Thus, you can use Object XYZ and World XYZ for textures mapped over the Phoenix Simulator. Object XYZ means that the texture will always be stretched over the Simulator box - e.g. if the Simulator is flat and wide and you map it with a checker, it would squash the checker vertically, and stretch it horizontally. If your simulation uses adaptive grid and it expands and shrinks over time, the texture will also expand and shrink together with the grid when Object XYZ is used. On the contrary, when using World XYZ, the texture will be fixed in world space, so the features of the texture will remain in the same place even if the grid grows or even if the grid is animated to move around in space - it would 'swim' through the texture. World XYZ mapping is useful for the Phoenix Ocean Texture whose waves should be tied to the world space and in most cases should not be carried around with a moving simulation grid.
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Phoenix TexUVW
When you want your texture to move together with the fire/smoke or liquid, you need to simulate with Phoenix's Texture UVW.
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- Enable Grid Texture UVW in the Output rollout of the Fire/Smoke Simulator or the Output rollout of the Liquid Simulator.
- Enable Texture UVW in the Dynamics rollout of the Fire/Smoke Simulator or the Dynamics rollout of the Liquid Simulator.
- If you want the simulation to inherit the UVW coordinates for a texture applied over an emitter, e.g. for melting a textured geometry, you also need to enable TexUVW from the Fire Source or the Liquid Source and choose the appropriate mapping options there.
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- By inheriting the UVs from the source geometry, when Inherit TexUVW from Geom is enabled on the Phoenix Source. The UVW channel will be based on the UVs of the emission geometry. This option is useful when simulating melting objects – textures assigned to the Volumetric Shader (for Fire/Smoke simulations) or the material (for Liquid simulations) will be carried by the simulation.
- When inheriting of UVs is disabled on the Source - depending on the position of the emitting object in the Simulator's bounding box. If Grid rollout → 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.