fix glsl model lighting on unlit maps (normal vector was calculated as (0,0,0) as...

The fix replaces these zero normal vectors by (0,0,1) (which vector is actually chosen does not matter, as its contribution is scaled by zero anyway).

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@7248 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/gl_rmain.c b/gl_rmain.c
index cda8dfcf25eaeb44dfc23a40f0bc195d6b4ea621..6d010a612ed0ff92b86e49cf2e6baa0dfdd60610 100644 (file)
--- a/gl_rmain.c
+++ b/gl_rmain.c
@@ -1686,7 +1686,14 @@ static void R_UpdateEntityLighting(entity_render_t *ent)
 
        // move the light direction into modelspace coordinates for lighting code
        Matrix4x4_Transform3x3(&ent->inversematrix, tempdiffusenormal, ent->modellight_lightdir);
-       VectorNormalize(ent->modellight_lightdir);
+       if(VectorLength2(ent->modellight_lightdir) > 0)
+       {
+               VectorNormalize(ent->modellight_lightdir);
+       }
+       else
+       {
+               VectorSet(ent->modellight_lightdir, 0, 0, 1); // have to set SOME valid vector here
+       }
 
        // scale ambient and directional light contributions according to rendering variables
        ent->modellight_ambient[0] *= ent->colormod[0] * r_refdef.lightmapintensity;