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Extruding a mesh on the Y axis doesn't work


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Basically I'm trying to extrude a shape on the Y axis. All of the points have a Y of 0, only the X and Z are differing each time.

When you're looking at the picture, you can see the white lines are the points connected by BABYLON.MeshBuilder.CreateLines, so the points shouldn't be the problem. However, if you are looking at that big grey thing going in the air, that's the extruded shape from the points. It seems that it doesn't extrude properly on the Y axis so it's really messed up.


The code looks like this:

BABYLON.MeshBuilder.CreateLines("line", { points: meshPoints }, scene);var block = BABYLON.MeshBuilder.ExtrudeShape("block", {shape: meshPoints,path: [new BABYLON.Vector3(0, -1, 0), new BABYLON.Vector3(0, 0, 0)],scale: 1,cap: BABYLON.Mesh.CAP_ALL}, scene);

As you can see, I just want it to be extruded from the bottom to the top, which should result in a box which follows the mesh points. It should look like the white lines, but then filled up and having a "height" to it.

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Just convert your array points (or clone it to another) so you redfine the shape in the xOy plane.

The model shape is not a mesh, it's just a logical model : a series of vector3

I've partially fixed it, however there's one problem which I can't figure out: http://www.babylonjs-playground.com/#RF9W9#181


As you can see, when you add the "cap" option, there are some weird black parts and parts which shouldn't be capped at all. 

(PS: I added some alpha so you can see the yellow line representing the shape..)

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The computation of the barycenter for extruded shape caps is a design choice (cf previous posts in another topic) to keep a good performance when  morphing dynamically the extruded shape : http://www.babylonjs-playground.com/#20IBWW#2

It works quite well for concave model shape but can have weird results for conves ones.

Maybe, in your case, you might use the polygon builder instead of the extrusion embedded capping.

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