libzoom: Compute default normals

1 files changed, 9 insertions, 1 deletions

diff --git a/level.c b/level.c
index 0d22f64..9118499 100644
--- a/level.c
+++ b/level.c
@@ -270,11 +270,19 @@ LEVEL *LoadLevel(char *filename) {
           }
         }
       }
+      
       v = VectorCross(
         VectorSub(level->rooms[i].walls[j].vertices[1], level->rooms[i].walls[j].vertices[0]),
         VectorSub(level->rooms[i].walls[j].vertices[2], level->rooms[i].walls[j].vertices[0])
       );
-      if(VectorLengthSq(v)) level->rooms[i].walls[j].normal = VectorNormalize(v);
+      if(VectorLengthSq(v) > 0.0) {
+        level->rooms[i].walls[j].normal = VectorNormalize(v);
+        
+        for(k = 0; k < 3; k++) {
+          if(VectorLengthSq(level->rooms[i].walls[j].normals[k]) == 0.0)
+            level->rooms[i].walls[j].normals[k] = level->rooms[i].walls[j].normal;
+        }
+      }
       
       j++;
     }