How to preserve / depict depth-information

[MartinPyka]

With a couple of modifications in DxfViewer (#99) I got perspective rendering and 3d rotation working. Now I am wondering where the depth information are omitted in the parsing process.

When I look at line.js and ParseHelper.js I get the impression that everything should work just fine. I cannot really figure out where exactly the information get lost. Can you give me an advice?

[vagran]

For example, 3DFace vertices, x/y stored only:

dxf-viewer/src/DxfScene.js

Line 785 in b7c14a6

const v0 = new Vector2(vertices[0].x, vertices[0].y)

Vertices accumulation:

dxf-viewer/src/DxfScene.js

Line 2151 in b7c14a6

const idx = this.vertices.Push(v.x)

Also see all 2D transforms in this file.

Shader code assumes 2D coordinates and transforms in buffers:

dxf-viewer/src/DxfViewer.js

Line 564 in b7c14a6

const fullInstanceAttr = instanceType === InstanceType.FULL ?