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The area near the Quad secret on E1M1 is notorious for flickering or changing appearance from various angles even with some previous called "z-fighting fixes" that don't really do the job.
![Image](http://www.quakeone.com/proquake/qrack001.jpg)
The only engine I've tried with a proper z-fighting fix is:
ezQuake (I confess I have not tested FTE for this)
There are a number of engines with ALMOST a proper z-fighting fix. The closest in the almost category is Qrack. However, I get an outline in the start map atrium as a side-effect.
I still get various types of weirdness in the E1M1 area with:
DarkPlaces, FitzQuake, aguirRe Quake, QMB and every other GL engine I've ever used and thought to look for the problem.
Qrack side effect, not in ezQuake:
![Image](http://www.quakeone.com/proquake/qrack000.jpg)
I don't like trading a fix in one area for a problem in another eventually I tried to identify the difference between the Qrack and ezQuake fix.
I've tried the ezQuake fix in 2 engines with the same result of a perfect solution (gl_ztrick 0 is required, some engines don't even support gl_ztrick 1 anymore).
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Here is the ezQuake fix:
z-fighting fix step 1: in gl_vidnt.c .. or sometimes vid_wgl.c or vid_commongl.c or vid_gl<operating sys>.c
1. Goto GL_INIT or the equivalent
2. You will see OpenGL code resembling the following ...
3. Add after the glAlphaFunc line (although it really doesn't matter)glClearColor (0.15,0.15,0.15,0);
glCullFace(GL_FRONT);
glEnable(GL_TEXTURE_2D);
glEnable(GL_ALPHA_TEST);
glAlphaFunc(GL_GREATER, 0.666);
z-fighting fix step 2: in gl_rmain.c// Get rid of Z-fighting for textures by offsetting the
// drawing of entity models compared to normal polygons.
// (Only works if gl_ztrick is turned off)
glPolygonOffset(0.05, 0);
1. Find void R_DrawEntitiesOnList (void)
2. Locate " case mod_brush:"
3. After that, but before the "break;", insert:
Code: Select all
// Get rid of Z-fighting for textures by offsetting the
// drawing of entity models compared to normal polygons.
// (Only works if gl_ztrick is turned off)
if(!gl_ztrick.value)
{
glEnable(GL_POLYGON_OFFSET_FILL);
}
R_DrawBrushModel (currententity);
if(!gl_ztrick.value)
{
glDisable(GL_POLYGON_OFFSET_FILL);
}
break;
I'm guessing that Qrack's use of 1 vs. 0.05 makes the difference in seeing the line, but I'm not 100% certain?