Smoke

Category: Volume

Shader Family: Volume

Output: Color

Uses the transformations of objects or an input transformation to define ellipsoidal volumes of smoke in front of rendered geometry.

The shader employs a ray-marching technique for a full 3D effect.

Object Sources

Add	Click to add an object or transformation to define the center of an ellipsoid of smoke. Repeat for additional ellipsoids.
Clear	Remove all objects and transformations. Click the Edit Array Item icon (the " blue socket") to remove objects or transformations individually.

Defines a transformation manually, or links to the transformations of an object in the scene.

ref	Click Pick to link to an object in the scene.
pos	Defines a position, if the transformation is not linked to an object.
Radius	Defines the XYZ size of the ellipsoid. This is further affected by scaling.
rot	Specifies the complete 4x4 transformation, if the transformation is not linked to an object. It is cumulative with pos.

Transparency	Defines the transparency of the smoke.
Step	Defines the number of steps in the ray march.
Time Factor	A multiplicative factor in the turbulence equation that controls the degree of animation between successive frames.

RGB	Defines the smoke's RGB color components as the distance from the smoke source increases. The falloff value is exponential.

RGB	Defines the smoke's intensity. You can control the color intensity of the smoke effect by setting the sliders.

Iteration	Specifies the iteration factor that controls the amount of turbulence in the smoke.
Spread	Controls self-similarity of the turbulence. Low values increase self-similarity and tend to give a softer or puffier-looking smoke; high values tend to give a harsher or more chaotic-looking smoke.

Swirl	Specifies the amount of horizontal turbulence in the smoke.
Squish	Specifies the amount of vertical turbulence in the smoke.

This shader is applied to a scene using the shader stack. Volume shaders cannot be expanded or built upon in the render tree.