SVN commit 1009233 by rivol:

Fix specular lighting calculation.

 M  +7 -3      material-object.frag  
 M  +7 -3      material-ship.frag  


--- trunk/playground/games/astrododge/data/shaders/material-object.frag #1009232:1009233
@@ -14,10 +14,14 @@
     float specularity = 30.0;
 
     float NdotL = max(dot(N, L), 0.0);
-    vec3 R = 2.0 * NdotL * N - L;
-    vec3 V = normalize(-vertexEye.xyz);
-    float spec = pow(max(dot(R, V), 0.0), specularity);
 
+    float spec = 0.0;
+    if (NdotL > 0.0) {
+        vec3 R = 2.0 * NdotL * N - L;
+        vec3 V = normalize(-vertexEye.xyz);
+        spec = pow(max(dot(R, V), 0.0), specularity);
+    }
+
     return (texColor * NdotL + specular*spec) * Lcolor;
 }
 
--- trunk/playground/games/astrododge/data/shaders/material-ship.frag #1009232:1009233
@@ -10,10 +10,14 @@
     float specularity = 30.0;
 
     float NdotL = max(dot(N, L), 0.0);
-    vec3 R = 2.0 * NdotL * N - L;
-    vec3 V = normalize(-vertexEye.xyz);
-    float spec = pow(max(dot(R, V), 0.0), specularity);
 
+    float spec = 0.0;
+    if (NdotL > 0.0) {
+        vec3 R = 2.0 * NdotL * N - L;
+        vec3 V = normalize(-vertexEye.xyz);
+        spec = pow(max(dot(R, V), 0.0), specularity);
+    }
+
     return shipBaseColor * Lcolor * (NdotL * diffuse + spec * specular);
 }