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Meanwhile, the Particle Preview section lets you to control the visibility of different Particle Types, such as Drag particles emitted from a Fire Source, and manage their preview color.

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The parameters here control the visualization of Particle Types generated by the Simulator. Phoenix can only preview the Particle Types present in the cache file for the current frame, such as Drag particles emitted using a Fire Source.

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You can specify a Particle Channel to use as a basis for adjusting the particle preview color, using the Scale Color By option. If you export the Velocity particle channel when emitting Drag particles, you could then set the Scale Color By option to Speed, so that the faster the particles move, the whiter they appear in the preview.

You can find more info on Particle Channels from the Particle Channel Ranges page.

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Only the Overlap Of: | prv_and – When enabled, shows only the cells where the following selected channels overlap.

Temperature | prv_temperature, prv_t_threshold, prv_t_threshold2, prv_t_color, prv_t_color2 – Enables the representation of the temperature. 

As Fire | prv_plank_t – When the temperature is in Kelvins, e.g. when coming from a Phoenix simulation, the voxel colors come from a physically correct black body radiation model. In this mode the custom color for the temperature are disabled. Check the Grid Channel Ranges for more info.

Smoke | prv_smoke, prv_smoke_threshold, prv_smoke_threshold2, prv_smoke_color, prv_smoke_color2  – Enables the representation of the smoke. 

Fuel | prv_fuel, prv_fuel_threshold, prv_fuel_threshold2, prv_fuel_color, prv_fuel_color2 – Enables the representation of the fuel. 

Velocity | prv_velocity, prv_v_threshold, prv_v_threshold2, prv_v_color, prv_v_color2 – Enables the representation of the velocity.

Velocity Streamlines | viewVelStreamlines, viewVelStreamlinesThreshold, viewVelStreamlinesThreshold2, viewVelStreamlinesColor, viewVelStreamlinesColor2 – Traces the velocity field of the cache files to generate a streamline preview.

As Rainbow | viewVelStreamlinesColorCurve – Represents the Velocity Streamlines in rainbow colors, where red is the fastest, green is medium speed and blue is the slowest.

Lines Length | viewVelStreamlinesMaxIterations – Signifies the maximum length of each streamline in the preview. Adjusting the value will provide you with a guide/preview of the velocity field's motion. The Streamline's length is measured in voxels and at the lowest setting, the Streamlines will be no larger than a voxel.

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The Velocity Preview is inactive when the Forces Preview is enabled, and vice versa. Similarly, the Velocity Streamlines Preview is inactive when the Force Streamlines Preview is enabled, or the other way around.

Forces | prv_forces, prv_f_threshold, prv_f_threshold2, prv_f_color, prv_f_color2, prv_force_list – Enables preview of how Phoenix forces or standard 3ds Max forces will affect the simulation. This preview can be shown even without any loaded simulation.

Force Streamlines | viewForceStreamlines, viewForceStreamlinesThreshold, viewForceStreamlinesThreshold2, viewForceStreamlinesColor, viewForceStreamlinesColor2 – Enables a streamline preview of how Phoenix forces or standard 3ds Max forces will affect the simulation. This preview can be shown even without any loaded simulation.

As Rainbow | viewForceStreamlinesColorCurve – Represents the Force Streamlines in rainbow colors, where red is the fastest, green is medium speed and blue is the slowest.

Lines Length | viewForceStreamlinesMaxIterations – Signifies the maximum length of each streamline in the preview. Adjusting the value will provide you with a guide/preview of the force field's motion. The Streamline's length is measured in voxels and at the lowest setting, the Streamlines will be no larger than a voxel.

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Use the Add or Remove buttons to select which forces will be previewed. Unlike other voxel preview channels which use the size of the loaded cache, the Forces preview can also work without a loaded cache and will use the grid size of the Simulator.

Additionally, some Phoenix and standard 3ds Max forces such as the Drag force are not supported yet, and are shown as if their velocity is always 0 and will not be visible. In addition, forces that act differently depending on the quantity of content in the grid (e.g. amount of liquid, smoke, or no content) are not yet supported by the preview.

RGB | prv_uvw, prv_uvw_threshold, prv_uvw_threshold2 – Enables the representation of the RGB channel.

Auto Range | prv_autorange – When enabled, automatically adjusts the preview ranges of visible channels for the current frame so that important data is always visible and the preview is always quick.

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Bake Streamlines

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Draw a Slice | prv_sect – When enabled, only a voxel-thick cross-section of the grid is visible. This works for voxels, particles, and velocity streamlines, but not for the GPU Preview or the Mesh Preview. It allows for a better view of occluded details and can help when previewing very rich data such as velocity fields, or in order to see underwater cavities.

Along Axis X, Y, Z | prv_sect_axis – Specifies the axis along which the grid will be sliced.

Disabled – Turns the Draw Just a Slice feature off.

Slice Level | prv_sect_lvl – Specifies the offset of the slice from the bottom center of the grid in voxels.

Slice Width | prv_sect_width – Specifies the width of the slice in voxels.

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