ConservativeDensity

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API > API/Runtime > API/Runtime/Engine > API/Runtime/Engine/Materials > API/Runtime/Engine/Materials/UMaterialExpressionVolumetricAdv-_1

Syntax

UPROPERTY (  
          Meta=(RequiredInput="false", ToolTip="This is a 4-components float vector. The X component must represent the participating medium conservative density. This is used to accelerate the ray marching by early skipping expensive material evaluation. For example, the bare minimum would be a top down 2D density texture skipping evaluating the full material in empty regions (better, would be a simple blobby volume representation of clouds). The Y, Z and W components can contain parameters that can be recovered during the material graph evaluation using the VolumetricAdvancedMaterialInput node. Evaluated per sample."))  
FExpressionInput ConservativeDensity  
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Remarks

This is a 3-components float vector. The X component must represent the participating medium conservative density. This is used to accelerate the ray marching by early skipping expensive material evaluation. For example, a simple top down 2D density texture would be enough to help by not evaluating the material in empty regions. The Y and Z components can contain parameters that can be recovered during the material evaluation using the VolumetricAdvancedMaterialInput node. Evaluated per sample.