Hi, In some cases, when i try to create a concave polyhedron, some faces doesn’t render as expected. Babylon.js Playground Babylon.js playground is a live editor for Babylon.js WebGL 3D scenes

Yes but the ExtrudePolygon works only in a XZ plane with Y extrusion. It works for my needs with a simple “if the plane is horizontal use Extrude else use Polyhedron” : https://playground.babylonjs.com/#5XGGIC#5 , but it still particular

That’s probably that the winding of these faces is wrong: you will have to reverse the order of the vertex indices for these faces (instead of being (index1,index2,index3), it should be (index1,index3,index2)).

I tried using ExtrudeShapeCustom, which mostly works, but there are some rotations where the U turns: Babylon.js Playground Babylon.js playground is a live editor for Babylon.js WebGL 3D scenes I don’t know if this is fixable or a by-product of the method…

The algorithm proposed in this video is, perhaps, a good replacement for the current calculation method?

Actually, it happens that the existing ExtrudePolygon method can be used: Babylon.js Playground Babylon.js playground is a live editor for Babylon.js WebGL 3D scenes

You can also rotate the mesh after extrusion if it’s not in the right orientation.

Not really cause my points are not always in the XZ plane, I could do something like project them on the XZ plane but I don’t know if BABYLON propose that and if not I think that I’ll have to do a lot of calcul

If your points aren’t in a plan, I don’t think we have a solution in Babylon indeed.

Hi everyone, I answer to this post because i’ve the same problem as @VerandaLouis . I mean, it is really difficult to build a polygon in space in BabylonJS because there are probably too many ways to do but each way has restrictions. Today, i think that there are 3 methods : BABYLON.MeshBuilder.…

Concave polyhedron face

Bugs

VerandaLouis June 19, 2023, 3:43pm 3

In reference to this answer you provided, how can i do to create a “U” polyhedron like on this PG

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Concave polyhedron face

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