Inside closed mesh goal

[ruphan]

I have a box that I need to populate uniformly. Apparently, populate 3D gives only random points and not uniformly distributed points. So I used the zombie solver with on mesh and P_Law(repulsive) goals. This makes the points get distributed uniformly on the surface of the box. Is there any goal like ‘inside closed mesh’ to achieve what I need?

[Joseph_Oster]

You could convert the mesh to a Brep (polysurface) and then apply Point In Brep to a 3D grid of points to cull only those inside.

Mesh to surface/ Polysurface to single surface

Mesh to multi-faceted polysurface can be very simple but I didn’t bother to post this because the result is not a single surface, as required here. [mesh_brep_2020Aug19a] mesh_brep_2020Aug19a.gh (52.7 KB)

[ruphan]

The problem with that is it just tests for point inside the mesh and I lose all the points as they get repelled away out of the mesh due to the P_law goal

[Joseph_Oster]

Without posting your code, I have no clue.

[DanielPiker]

I think the code I posted in this thread might be what you need:

Kangaroo 2 Solid Point Collide Bug/Significant increase in calculation time

Solid_pt_newCollide_4.gh (55.6 KB) Tracked down the issue - it wasn’t what I first thought. The problem was that when a particle had crossed the mesh once since the previous iteration, and ended up inside, I was pulling it back to that crossing. However, that was introducing a spurious tangential component. Switching to always pulling to the closest point fixes this.

[Joseph_Oster]