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When there is both Smoke and Fire (diffuse and emissive) in the same voxel, you can use the Fire Opacity Mode in the Fire sub-rollout to determine the resulting color and alpha. The Fire can simply use the opacity that is set for the smoke in the Smoke Opacity sub-rollout, or you can separate their opacities for additional control, using either the the Fully Visible or Use Own Opacity modes in the Fire sub-rollout. |
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Using the Based on parameter below, you can achieve a wide variety of results when shading Fire & Smoke. For example, the Fire (emissive content) is by default based on the Temperature Grid Channel. If instead it were based on Smoke Grid Channel data, then voxels containing Smoke values would be shaded as emissive (Fire). In other words, the Smoke would be rendered as Fire. On the other hand, if the Smoke Color (diffuse) & Smoke Opacity were based on Temperature, then voxels with Temperature values would be shaded as diffuse volumetrics (Smoke Color & Opacity). In other words, the Fire would be rendered as Smoke. |
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