Houdini 20.5 Nodes VOP nodes

Karma Pyro Fire Color VOP node

Creates a color value used to control the emission component of volume shading used for fire.

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This node reads in volumes, one for intensity and one for color. These volumes are remapped to generate a combined color output, which can be used to control the emission aspect of volume shading.

This node is intended as a building block for building larger volume shader.

Overview

Parameters

Intensity

Intensity Scale

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.

Source Range

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).

Fire Intensity Ramp

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

Color

Color Mode

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.

Note

Planck Blackbody incorporates emission power into the calculated color. The power scales rapidly at high temperatures, so you might need to reduce emission intensity to compensate. To use the pure physical blackbody color, set emission intensity to constant 1.

Source Range

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

Fire Color Ramp

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

Temperature Scale

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

Bindings

Intensity Volume

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

Color Volume

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

See also

VOP nodes