Working of solid plane collide

Hi! I’m new to using collisions in kangaroo. I’m not quite able to grasp the mechanics behind the “SolidPlaneCollide” component. Can someone briefly explain what kind of interaction happens between the mesh and a plane?

Download “” from here:

Or this:

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These just have the implementations of collisions using the grasshopper/kangaroo components. There is no explanation of the working of the component.