How to get vertices of a rotated line

Questions
1

Hey guys I have a straight line mesh rorated in an angle around the Z axis so the mesh is rotated in the x and y axis, however if I access the positionKind from mesh.getVerticesData after the rotation, I’m still getting the original positions. Whats the method to get and update their vertices?

2

You can either call mesh.bakeCurrentTransformIntoVertices before calling getVerticesData or transform the vertex positions by the transformation matrix of the mesh (mesh.computeWorldMatrix(true)) yourself.

Here’s how bakeCurrentTransformIntoVertices is doing it:

var transform = this.computeWorldMatrix(true);
var data = <FloatArray>this.getVerticesData(VertexBuffer.PositionKind);

var temp = new Array<number>();
var index: number;
for (index = 0; index < data.length; index += 3) {
    Vector3.TransformCoordinates(Vector3.FromArray(data, index), transform).toArray(temp, index);
}
1 Like
3

Hey @Evgeni_Popov, I’ve tried the bakeCurrentTransformIntoVertices but I’m getting the same results. here’s my playground : https://playground.babylonjs.com/#5HWJT3#6
old and new positions in the console are still the same

4

You forgot the parenthesis: clone.bakeCurrentTransformIntoVertices; => clone.bakeCurrentTransformIntoVertices();

1 Like
5

oh thanks, but now it looks like it actually changed the geometry to something else. It’s not on the same angle as it was before.

6

All clones share the same geometry, so changing the geometry for one (as bakeCurrentTransformIntoVertices does) changes for all.

You should call clone.makeGeometryUnique(); to make unique geometry for your clone.

2 Likes
7

thank you so much :slight_smile: