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Section

Value Expression Item

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valueExpression
valueExpression

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The Value Expression Item is the lowest level operator. It expects no sub-expressions but can be converted to a Math Expression Item by selecting it with the right mouse button in the Conditions Tree.

The Value Expression Item returns a raw number which can be either the value of a Grid Channel or a Texture for a given cell of the Phoenix FD Simulator, a manually-specified number in a certain range or the distance between a given cell and an object in the scene.



Number [ 1 ] | val_type, val_number – returns the specified value.

Random Between [ 0 - 1 ] | val_type, val_rand_min, val_rand_max – returns a random number in the selected range. Note: a different value is generated for each cell of the Simulator. The value also changes for every frame.

Channel [ Temperature ] | val_type, val_chan_grid – returns the value of the specified Simulator Grid Channel for the current cell. You must have this grid channel enabled in the Output rollout of your Simulator. The Channel can be one of: [ Temperature ], [ Smoke ], [ Fuel ], [ Speed ], [ Velocity X ], [ Velocity Y ], [ Velocity Z ], [ RGB Red ], [ RGB Green ], [ RGB Blue ]. You can find out more about the usual grid channel ranges in Phoenix here.

Distance To [ None ] | val_type, val_dist_node – returns the distance from the current voxel to the surface of the specified object. Will be positive if the voxel is outside the object volume, and will be negative if the voxel is inside the object volume. The distance is in simulation grid voxels. Note: currently you can only pick polygon meshes - measuring distance from the current voxel to a nearest particle from a particle system is currently not supported.

Texture [ No Map ] | val_type, val_tex – returns the specified texture's color intensity in the position of the current voxel. The Phoenix FD Simulator has no Explicit UV coordinates therefore the texture's Mapping should be set to Planar from Object XYZ for this to work.

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