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Objective:

Learn how to create a selection of random points from a List of Points by using surface roughness to filter the points based on volume.

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Note:

To start, you will need to download and import the Custom Block: Filter Points by Volume.

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Procedure:

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1. Set-up:

  • Import your part,
  • Convert it to a mesh
  • Input your mesh into a Remesh Surface block to create an even mesh

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2. Create Random Points

  • Add the block Random Points on Mesh
    • Set the spacing and amount to your desired value
A mesh with the Random Points on Mesh block applied.

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3. Create the Volume to filter with

Since we are filtering by volume, we want to create a volume that randomly covers some of the points. There are a few methods to do this with the different noise blocks such as Simplex Noise , Cellular Noise 3D , and Surface Roughness.
  • Add a Surface Roughness block
  • Insert your model as the Body
    • Edit the Roughness frequency, amplitude, and seed value to change your results
The same mesh and random points as above. The implicit body used to generate the mesh is overlayed. The implicit has a texture applied using the Surface Roughness block.

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4. Filter the points

  • Add the Filter Points by Volume block
    • Use the Surface Roughness as the Volume input
    • Set the Region to Outside
The mesh with overlayed textured implicit. A Filter Points by Volume block is applied to isolate the points that are outside of the textured implicit body.

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5. Optional: Create a list from the remaining points

  • Duplicate the Filter Points by Volume block
    • Set the Region to Inside to create the opposite selection of Points
And that’s it! You’ve successfully created two random selections from a list of Points. Are you still having issues? Contact the support team, and we’ll be happy to help!

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Download the Example file:

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More on this topic:

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Keywords:

mesh surface texture volume list points selection filter point roughness random how-to