Mask Bifröst foam emission

You can limit foam emission to the volume of a polygon object using a Foam Mask. This gives you more control over which regions of liquid generate foam particles. For example, add a masking object around a boat and its wake so that foam only generates in this area of the liquid.

Add foam masks

1. Select the following:
   • One or more polygon meshes to act as the masking volumes. Instances are not supported.
   • Either the liquid or foam object.
2. Select Bifrost Fluids > (Add) Foam Mask.

Remove foam masks

1. Select the following:
   • One or more existing foam masks.
   • Either the liquid or foam object.
2. Select Bifrost Fluids > Remove > Foam Mask.

Control foam masks

Use the Enable options in the bifrostFoamMaskProp node attributes to toggle the mask's effect and evaluation on and off. In addition, you can use the Conversion options to control how the mask volume is voxelized. See Bifrost Foam Mask attributes.

To soften the emission boundaries around the masking object, adjust the Mask Falloff Distance in the Behavior group of the bifrostFoamProperties node attributes. See Bifrost Foam attributes.

Related topics

• Control Bifröst foam emission
• Emit Bifröst foam using an adaptive camera
• Bifröst Foam properties attributes