I am learning DirectX 9 and I have these test models in my scene and this weird texture flashing happens.

If you look at the bottom of the picture you will see a blue area, that is supposed to be filled with the ground texture I have. So every time I move my camera the ground texture flashes very quickly and parts of it disappear lots of times a second. I know it's not a problem with my video card. What could cause this?

enter image description here


1 Answer 1


Your problem has nothing to do with texturing. Your are experiencing the ancient problem of Z-Fighting.

This should be caused either by some interpenetrations between your meshes or, less likely, due to very low accuracy of the Z-buffer in your graphics card.

  • \$\begingroup\$ Mesh interpenetrations are probobly the cause but what are they exactly and do I solve it by recreating the mesh or what do I do? \$\endgroup\$
    – MisterArch
    May 6, 2014 at 22:35
  • 1
    \$\begingroup\$ @MisterArch: You probably have the range between zNear and zFar too great. You have to realize that the depth buffer is (usually) fixed-point, if you have a 16-bit depth buffer you have 65536 unique depths you can distinguish. Now if you have a near plane of 0.001 and a far plane of 10000.0, the smallest difference in depth you can distinguish is ~0.153 units (9999.999 <-- (zFar - zNear) / 65536.0 <-- (fixed-point resolution)). The solution is either to reduce the range between zNear and zFar or increase the precision of the depth buffer. \$\endgroup\$ May 6, 2014 at 22:47
  • \$\begingroup\$ Where can i set the znear and zfar? \$\endgroup\$
    – MisterArch
    May 6, 2014 at 22:57
  • \$\begingroup\$ @MisterArch: In your projection matrix. \$\endgroup\$ May 6, 2014 at 23:00
  • \$\begingroup\$ Thank you very much that fixed it. This makes more sense now. When I was creating the projection matrix I made an error and put a 1.0 in the ZFar. \$\endgroup\$
    – MisterArch
    May 6, 2014 at 23:03

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