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Color & Opacity

Thickness

Low values can be used for steam or vapor, high values for thick smoke.

Unlike rigid bodies, smoke particles usually do not fill space up completely. Therefore, smoke is always partially transparent. However, the larger the distance that light travels through smoke and the thicker it is, the higher the probability that light rays hit a smoke particle and get scattered or absorbed. That is, while you may be able to look through 1 inch of smoke at thickness 1, 10 inches may be virtually opaque. At thickness 10 however, you may not even be able to look through 1 inch of smoke.

Brightness

The brighter the smoke, the more it will reflect incoming light. You can also adjust the smoke's brightness using the Smoke Color below, but this parameter allows for HDR brightness ranges and is easier to adjust - especially if you have a gradient set for the Smoke Color.

Smoke Color

Defines the smoke color gradient. It assigns colors to re-mapped channel values.

The default is to use a single color for all input values (0 to 1) and let only opacity and illumination shade the smoke.