Houdini – Separate continuous mesh parts to groups

Software:
Houdini 18.5

Separate a mesh to groups by continous parts (elements):

  1. Use the Connectivity SOP node to assign each mesh primitive an integer attribute based on the continuous mesh element in belongs to.
    This attribute can be named “element” or “part” for example.
  2. Use the GameDev Group by Attribute* node to assign each mesh primitive to a different group according to its “part” attribute (if you named it “part” that is..).
    Set a group name prefix, like “part_” or “element_”. the node will generate numbered groups per each mesh part like so: “element_0”, “element_1”, “element_1″….
  3. Use this group separation as a filter to create whatever part-selective effect you need.

* The GameDev Group by Attribute node ships with the Game Development Toolset

Blender – Split curve

Software:
Blender 2.92

To split part of a curve to a separate curve:

  1. Select the split end points, press V and select Free.
    > This keeps the new curve ends at original direction, if their handle type was Automatic.
  2. In Edit mode, select a sequence of control-points.
  3. Press P and select Separate.