I am making a 3D level editor for my game and would like to add grid lines, but ones better (namely, thicker) than the thin 1-px lines created by rendering a LINE_LIST. I've run across several posts using D3DXLine, and tried it myself, but found that the transforms were buggy, so I set out to make 3D lines from quads aligned to face the camera (i.e., billboards). I do not completely understand billboards, but I've been playing with them long enough to have a general feel of how they work and can create some on my own.

I would like to keep the lines a constant thickness, no matter how close or far the camera is from them. I tried using an orthographic projection to no avail, and I've also tried doing a perspective divide manipulation (or rather, multiplication) on my billboard's vertices to find out how much I should scale them. No attempt so far I've made looks even remotely correct, and I think I'm just confusing myself trying to mess with different things for an easy solution...

Can anyone outline the basic steps of how I would go about doing this (e.g., step 1, make quad vertices, step 2, rotate, step 3...etc.)? How would you solve this problem?

An external link of someone solving the same problem, but without perspective (plus I'd rather not use a vertex shader and am having trouble understanding his assembly code):

http://stackoverflow...s-in-3d-directx

(Just a note--working in Direct3D9 via SlimDX and C#, so that's why I reference Direct3D-specific names, but I have no need for API-specific examples--anything should work for me.)

Best regards,

-- Steve

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**Edit: SOLVED! And I'm very happy...See the following posts...**