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The Voxel Tuner uses custom logic to directly affect the cells of the Phoenix FD Simulator. It allows you to do very specific tweaks of the simulation which would otherwise be hard to achieve. It goes through all voxels in the grid and changes the values of those voxels that pass the custom condition you create. Example Conditions and Actions would be:
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This will essentially force the fluid to cool down only if it is emitted from a specific Phoenix FD Source with its RGB set to red. Fluid emitted from other sources and/or colored differently will not be affected by the Action.
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The Voxel Tuner is a powerful tool and it will not stop you from creating expressions such as "If the Temperature is higher than 0, increase the temperature by 100". This will infinitely keep raising the temperature throughout the Simulator until the simulation explodes, so you must be careful. Note that the Voxel Tuner affects all Phoenix FD Simulators in the scene unless they explicitly exclude it. |
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When [ Edit Condition... ] – Opens the Edit Condition window. The Edit Condition window is used to construct a sequence of tests which are evaluated for every cell of the Phoenix FD SimulatorPhoenix Simulator, at each simulation Step. If the cell satisfies the condition, the selected Then actions are performed - Change Voxel Channel or Affect By Forces. Otherwise, the cell is ignored. By default, the condition is set to "Temperature > 800", therefore only those cells where the Temperature channel is greater than 800 will be affected by the specified action. See the Grid Channel Ranges page for more information on the channel ranges.
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The Edit Condition window is at the core of the Phoenix FD Voxel Tuner. It consists of a Conditions Tree on the left and a Parameters panel for the individual elements in the tree on the right. The Change Voxel Channel action or the Affect By Forces action will only be executed for the cells of the Simulator which satisfy the conditions tree. The Conditions Tree is made up of the following expression types: Logic, Compare, Math, Value. Folding (collapsing) of a tree item in the view to the left will show you a simplified view of the expression. For example, collapsing the tree in the image below will change its text to "Temperature > 800.000", meaning the Voxel Tuner will affect only voxels where the Temperature grid channel is higher than 800. You can also read a simplified view of the entire condition expression in the text box below the Edit Condition... button. |
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Value Expression Item
Number | val_type, val_number – returns the specified value. Random Between | 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 | 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 | 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 | 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 or World XYZ for this to work. |
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