Enables the smoke aspect of the volume. Smoke absorbs and attenuates light traveling through it. Use Smoke Volume to identify the volume storing the smoke’s density.

Controls the overall density of the smoke. Increasing this value will give the smoke a thicker appearance. Reducing it will make the smoke less opaque.

Specifies the horizontal extent of the Density Ramp, which is evaluated to get the transformed smoke density.

This parameter is available when the menu next to Density Scale is set to Use Ramp.

Controls how the smoke’s density values are remapped. The horizontal axis of this ramp spans Density Range.

This parameter is available when the menu next to Density Scale is set to Use Ramp.

When turned on, smoke densities are affected by the Density Control Volume. In particular, the control volume’s value is mapped from Control Range to Density Scale, which is then multiplied by smoke’s density.

With the default settings, the densities are unchanged where temperature volume is 0. As the temperature values rise towards 1, the densities will be increased. If the temperature value equals or exceeds 1, the smoke will be twice as dense. This is useful to bring out more details when using emission masking.

Density Control Volume values are remapped from this range to Density Scale before the result is multiplied by density values. Set the menu on the right to Use Ramp if you want to control the mapping. When this menu is set to Constant, mapping is linear.

Controls the range of multipliers that can be applied to density by the control volume.

Determines how the control volume values are mapped to density scales. The horizontal and vertical axes of this ramp span Control Range and Density Scale, respectively.

This parameter is available when the menu next to Control Range is set to Use Ramp.

Controls the overall smoke brightness. This value acts as a multiplier on top of the smoke color. Increase this value to get brighter smoke.

Controls the overall color of the smoke. To get more natural looking smoke, change the menu on the right side of this parameter from Constant to Use Ramp. This will allow you to vary the smoke’s color with its density.

The minimum and maximum density values to map to the left and right endpoints of the Smoke Color Ramp.

This ramp controls how the smoke’s density values are mapped to its color. The horizontal axis of the Smoke Color Ramp spans the Density Range. For example, you can use this ramp to make the smoke have a darker color where it is more dense.

The color that is absorbed as light travels through the volume.

The color of shadows cast by the volume. Change the menu on the right side of this parameter from Constant to Use Ramp to change the color of the shadow based on smoke density.

This multiplier applies on top of Density Scale when the volumes are lit. Increasing this value will result in less light penetrating the volume, without affecting the smoke’s opacity to the viewer. Decreasing this value reduces the light’s absorption, without changing how opaque the smoke appears.

The minimum and maximum density values to map to the left and right endpoints of the Shadow Color Ramp.

Controls how the smoke’s density values are mapped to its shadow color. The horizontal axis of this ramp spans the Density Range.

When turned on, the smoke color set by the Smoke Color parameter is multiplied by Cd color volume if it exists to obtain the final smoke color.

When turned on, the Alpha volume is used to blend between the Smoke Color and the Cd volume instead. Where alpha has the value of 1, it will use the color from the Cd volume and where Alpha is 0, it will use the color set by Smoke Color. When this checkbox is turned off, the smoke color is the product of these two values instead.

Controls the direction in which light entering the volume is scattered. At the default of 0, light scatters evenly in all directions (isotropic scattering). Positive values up to 1 scatter more and more in the same direction as the incoming light, negative values down to -1 scatter backwards.

Use the menu on the right side of this parameter to change the phase based on a control volume (as bound by Phase Control Volume).

Along with Scattering Phase, this parameter controls the mapping of Phase Control Volume to the effective scattering phase. The first value of this range is mapped to the first value of Scattering Phase, and likewise for the second value.

Along with Control Range, this parameter controls the mapping of Phase Control Volume to the effective scattering phase. The first value of Control Range is mapped to the first value of this parameter, and likewise for the second value.

Enables the scattered emission aspect of the volume. Use this for shading explosions. This will generate the Scatter Volume, which is also used for rendering. Use Source Volume to identify the volume that controls this emission.

Explosion viewed with and without scatter enabled (Enable Mask is turned off).

Sets the emission intensity for the scatter. Increase this value to make the scatter brighter.

Scales the emission intensity for the scatter where the luminance of the scatter is bright. As the explosion fades off over time, you will see the effect of this parameter less and less even with very large values because over time the luminance of the scatter value is getting less and less. It is good to boost your explosion brightness at the beginning of the explosion. Increasing the value of Hot Core Scale brightens the explosions fissures.

Multiplies the emission color of the scatter with the smoke color (as set by Smoke Color). This allows for the color of the scatter to blend better with the smoke.

Sets how strong the scatter emission color needs to mix with smoke color (as set by Smoke Color).

The color of the scatter volume is calculated using Pyro Bake Volume, which means it is already baked in. By turning this on, you can do some color correction operations on the scatter volume.

Shifts the overall gamma of the input color. 1 is no change. Values less than 1 will decrease color values, and values greater than 1 will increase them.

Increases or decreases the gain for any of the RGB channels of the input color.

Masks the emission based on the Mask Volume using a threshold range. Mask Center and Mask Width control the masking range. By default, where the mask volume is at the minimum and maximum of this range, the additional emission multiplier is 1 and 0, respectively. Emission is reduced in areas where the mask value is larger. Masking is useful for bringing out crunchy details for an explosion.

Scatter with and without masking.

In conjunction with Mask Width, this parameter controls the range of values used for masking emission. The effective range of mask values is from Mask Center - Mask Width * 0.5 to Mask Center + Mask Width * 0.5. When set to a lower value, more of the emission will be masked and the explosion will glow less brightly. When set to a higher value, the volume will appear to glow internally, with this glow peeking through cracks in the smoke.

The video shows the effect of increasing this parameter while keeping Mask Width fixed.

Controls the range of values used for masking emission, in conjunction with Mask Center. The effective range of mask values is from Mask Center - Mask Width * 0.5 to Mask Center + Mask Width * 0.5.

Use a ramp to set how the emission changes between the minimum and maximum mask threshold (as set by Mask Center and Mask Width).

Sets how the emission changes between the minimum and maximum mask values (as set by Mask Center and Mask Width). White means full emission and black means no emission.

When the ramp is set white to black from left to right:

When the ramp is set black to white from left to right:

Enables a secondary emission component. Fire is mainly used for fire and flame type simulations.

Fire simulation viewed with and without fire enabled (Enable Mask is turned off).

Sets the emission intensity for the fire. Increase this value to make the fire brighter. Set the menu on the right side of this parameter to Use Ramp to remap the intensity.

The minimum and maximum source values to map to the left and right endpoints of the Fire Intensity Ramp. Increase the minimum source value to reduce the emissive parts of the volume.

By increasing the minimum value from zero, the area of the fire will shrink (Enable Mask is turned off).

Controls how the raw Intensity Volume values are mapped to effective intensity. The horizontal axis of this ramp spans Source Range.

Sets how the color is calculated for the fire. Color Ramp will map the colors using Fire Color Ramp from the given Source Range. Choose Physical Blackbody or Planck Backbody to compute color based on the temperature of an incandescent blackbody.

The minimum and maximum source values to map to the left and right endpoints of the Fire Color Ramp.

Controls how the Color Volume values are mapped to emission color. The horizontal axis of this ramp spans Source Range.

Scale applied to the Color Volume values before they are mapped to blackbody color.

The temperature corresponding to an input value of 0.0. This value is in Kelvin.

The temperature corresponding to an input value of 1.0. This value is in Kelvin.

When turned on, the computed Physical Blackbody curves are remapped using Adaptation and Burn.

Squashes or stretches the low end of the generated intensity, similar to exposing a photograph for shadows.

Manipulates the high end of the generated intensity.

Masks the emission based on the Mask Volume using a threshold range. Mask Center and Mask Width control the masking range. By default, where the mask volume is at the minimum and maximum of this range, the additional emission multiplier is 1 and 0, respectively. Emission is reduced in areas where mask value is larger. Masking is useful for bringing out crunchy details for an explosion.

Fire with and without masking.

Controls the range of values used for masking emission, in conjunction with Mask Width. The effective range of mask values is from Mask Center - Mask Width * 0.5 to Mask Center + Mask Width * 0.5. When this value is lower, more of the emission will be masked and the fire will glow less brightly.

Controls the range of values used for masking emission, in conjunction with Mask Center. The effective range of mask values is from Mask Center - Mask Width * 0.5 to Mask Center + Mask Width * 0.5.

Use a ramp to set how the emission changes between the minimum and maximum mask threshold (as set by Mask Center and Mask Width).

Sets how the emission changes between the minimum and maximum mask values (as set by Mask Center and Mask Width). White means full emission and black means no emission.

Enables a tertiary emission component. Second fire is useful for setting up glowing trails for explosions.

This component is conceptually very similar to primary fire. The only difference is that secondary fire does not support masking. As such, this tab is identical to Fire, aside from absence of the Masking section.

Explosion viewed with and without second fire enabled for the trails.

The name of the volume to be used as smoke. Usually you should leave this as density.

The control volume used to modify smoke density values. This volume is used if Use Control Volume is turned on. Use tempearture or flame.

When Scattering Phase is set to Use Ramp, values in this volume are used to determine the spatially-varying scattering phase.

The scatter emission color field. You can use the Pyro Bake Volume SOP to generate this volume.

Selects the volume that’s used for masking emission for the scatter component. Setting this to Smoke will use Smoke Volume for masking. Otherwise, the mask volume is specified in Custom Volume.

When Mask Volume is set to Custom Volume, this volume will be used for masking the scatter emission.

The name of the volume to be used for the intensity of the fire emission.

The name of the volume to be used for the color of the fire emission.

Selects the volume that’s used for masking emission for the fire component. Setting this to Smoke will use Smoke Volume for masking. Otherwise, the mask volume is specified in Custom Volume.

When Mask Volume is set to Custom Volume, this volume will be used for masking the fire emission.

The name of the volume to be used for the intensity of the second fire emission.

The name of the volume to be used for the color of the second fire emission.

Sets which emission component to output. All Combined should be used for getting final renders, while all other options can be used for debugging purposes.

Sets the name of this extra image plane on the selected mantra nodes (as set by Mantra Nodes to Update), when the Update Nodes with Image Planes button is clicked. To turn off the image plane on the mantra nodes, turn off the checkbox on the left side of this node and click Update Nodes with Image Planes again.

Sets the name of this extra image plane on the selected mantra nodes (as set by Mantra Nodes to Update), when the Update Nodes with Image Planes button is clicked. To turn off the image plane on the mantra nodes, turn off the checkbox on the left side of this node and click Update Nodes with Image Planes again.

Sets the name of this extra image plane on the selected mantra nodes (as set by Mantra Nodes to Update), when the Update Nodes with Image Planes button is clicked. To turn off the image plane on the mantra nodes, turn off the checkbox on the left side of this node and click Update Nodes with Image Planes again.

Sets the name of this extra image plane on the selected mantra nodes (as set by Mantra Nodes to Update), when the Update Nodes with Image Planes button is clicked. To turn off the image plane on the mantra nodes, turn off the checkbox on the left side of this node and click Update Nodes with Image Planes again.

Sets the name of this extra image plane on the selected mantra nodes (as set by Mantra Nodes to Update), when the Update Nodes with Image Planes button is clicked. To turn off the image plane on the mantra nodes, turn off the checkbox on the left side of this node and click Update Nodes with Image Planes again.

Sets the name of this extra image plane on the selected mantra nodes (as set by Mantra Nodes to Update), when the Update Nodes with Image Planes button is clicked. To turn off the image plane on the mantra nodes, turn off the checkbox on the left side of this node and click Update Nodes with Image Planes again.

A space separate list of render nodes which are updated based on enabled/disabled image plane names.

When this button is clicked, the set image plane names will be created on the given mantra nodes (as set by Mantra Nodes to Update).