7 replies to this topic

[alexndr]

While zooming out my scene I found that there are artefacts in Mesh (see image below, GIF 66 Kb. I can upload original screens if need.). How to fix this?

[monjardin]

Maybe this recent thread will help: <edit: sorry, I linked to the wrong thread I can't find the one I was looking for :(>

Anyway, you probable want to search for Z-Fighting.

[alexndr]

Actually, Z-Fighting occours when two or more co-planar polygons lie on the same plane, they share the same z-buffer values, but in my Mesh they dont lie on the same plane, they very close.




It seems like Z-Buffer has wrong values or smth else...Look at shelf pole.

[roel]

what are the distances of your near and far plane?

[alexndr]

Planes: 1.0f - 100.0f
The problem is in poor precision of the Z-buffer :] I changed DepthFormat from D16 to D24X8 and artefacts has gone.

[Reedbeta]

alexndr: it could still be Z-fighting. What is the precision of your depth buffer? If it is only 16 bits, try turning it up. Also, try increasing the near plane distance. The artifacts you are seeing are classic symptoms of Z-fighting.

[Reedbeta]

Ahh, never mind, you figured it out yourself :yes:

[alexndr]

Near plane was 0.01f, but not 1.0f as I wrote, increasing near plane also solves this problem. Thanks for help :)
Useful links:
http://nuttybar.dram...rch/002506.html
http://www.sjbaker.o...r_z_buffer.html