Smoke

Smoke Volume
Required string field to render expected density. Should always have a specified float field. Field is used in Density Float parameter of PxrVolume shader

Scatter

Source Volume
Field used to generate scatter data from.

Mask Volume
Field used to generate a multiplier to control area of effect for the scatter data generated from the Scatter Source Volume.

Scatter Volume
Required string field to write scatter results to.

Fire
Intensity Volume

Field used to generate base color and intensity values for the Diffuse Color Volume and Emit Color Volume.

Flame Volume
Field used to define area of application of color and intensity data from the Intensity Volume using the Fire Mask options in the Fire tab. Also is used to replace the density float value when Smoke is disabled

Color

Diffuse Color Volume
Required string field to have pyro render with user designed color instead of non-default color of (1,1,1). Field is used in Diffuse Color parameter of PxrVolume shader

Emit Color Volume
Required string field to have pyro render with user designed color instead of non-default color of (0,0,0). Field is used in Emission Color parameter of PxrVolume shader.

Render

Velocity Volume
Required string field to use velocities generated from simulation for motion instead of default value (0,0,0) or uniform direction specificed by user in Render tab. Empty string field will reveal uniform direction velocity parameters in Render tab. Field is used in Velocity parameter of PxrVolume shader.