Add surface interaction and collisions to Paint Effects strokes

You can add surface and interactions and collisions to Paint Effects strokes by setting Surface Snap, Surface Collide, and Surface Attract attributes.

To add surface interaction and collisions to Paint Effects strokes

1. -select the Paint Effects stroke and collision geometry.
2. Select Paint Effects > Make Collide.

   The stroke and selected geometry can now collide.

3. Select the Paint Effects stroke, and in the Tubes > Creation section of the brush's Attribute Editor, turn on Surface Snap.
   

   The start position of each tube now snaps to the closest points on the surface of the collision geometry. If some strokes interpenetrate the geometry, turn on Surface Collide.

   

4. In the Tubes > Behavior > Forces section, do the following:
   • Turn on Surface Collide.
   • Set Collide Method to specify which side of the geometry you want to collide.
   

   You can use Surface Attract to generate a force that pulls tube end points back toward the geometry surface.

5. In theTubes > Behavior > Forces section, do the following:
   • Set Surface Attract to adjust the strength of the attractive force.
   • Set Max Attract Distance to specify the area affected by the force.
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