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Z-Fighting

Started by Hassanbasil Jun 12, 2010 at 8:04 AM 1 replies 750+ views

Original Post

Jun 12, 2010 at 8:04 AM

Hello everyone,

I'm trying to pick a triangle of a mesh using the mouse, so, after i pick the triangle, i create a new triangle and place it over the original one to make it looks like i have "chosen" it, but here comes the problem, if i position it far to avoid z-fighting, it wouldn't look like it's one triangle (way too far from the original one), and if i place it close enough, i get annoying z-fighting when i move the camera away

So i was wondering if there is a way to draw my selection object's triangles always over the main object's triangles

Thanks for reading
-Hassan

shultays

Jun 12, 2010 at 9:51 AM

you can render second triangle using only stencil test. render object, set stencil bits to 1 while rendering. after render picked triangle, disable depth test and enable stencil test and render if stencil buffer is 1

not sure if this is a good idea though

szecs

Jun 12, 2010 at 10:15 AM

If you would draw the triangle using exactly the same modelview matrix and with less_and_equal depth comparison, there shouldn't be z-fighting. Maybe a simple code refactoring would suffice.

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