I have an urgent problem. I just ran my app on a Geforce 6 and i get heavy precision issues.
I render one pass and then blend another pass over that one. However, the blended pass seems to have a wireframe-overlay. It looks like the Geforce positions more than one pixel where the edges of two triangles touch. Because of additive blending the color then gets brighter, which leaves this wireframe look behind.
This ALWAYS happens. No matter, if i use shaders or not. And independet of the previous content of the framebuffer. I actually now blend only one simple textured pass over a black framebuffer and get those artifacts.
I use VBO and this happens with shared and non-shared vertices.
It also happens in immediate mode. I render shadow-volumes in immediate mode and the shadow is correct, but the volume is still visible, as if it was rendered in wireframe mode, because the values in the stencil buffer don’t get zeroed out correctly.
Has anyone encountered this before? It doesn’t happen on my Radeon. I would appreciate any hint, because i am under much time pressure to get this thing done (it should be done by tomorrow).
Thanks in advance,