light: bounce: force a "gate" like cutoff for bounce lights

light/light.cc

@@ -1016,25 +1016,29 @@ void GetIndirectLighting (const bsp2_t *bsp, const bsp2_dface_t *face, const vec
         if (dp2 < 0)
             continue; // vpl behind sample face
         
+        // get light contribution
+        vec3_t color;
+        VectorScale(vpl.color, vpl.area, color);
+        
+        // clamp away hotspots
+        if (dist < 128) {
+            dist = 128;
+        }
+        
+        const vec_t dist2 = (dist * dist);
+        const vec_t scale = dp1 /* * dp2 */ * (1.0/dist2) * bouncescale;
+        // dp2 makes things too angle-dependent
+        
+        VectorScale(color, 255 * scale, color);
+        
+        if (((color[0] + color[1] + color[2]) / 3) < 0.25)
+            continue; // too dim
+        
         if (TestLight(vpl.pos, origin, NULL)) {
-            vec3_t color;
+            VectorAdd(colorout, color, colorout);
-            VectorScale(vpl.color, vpl.area, color);
-            
-            // clamp away hotspots
-            if (dist < 128) {
-                dist = 128;
-            }
-            
-            const vec_t dist2 = (dist * dist);
-            const vec_t scale = dp1 /* * dp2 */ * (1.0/dist2) * bouncescale;
-            // dp2 makes things too angle-dependent
-            
-            // no occlusion
-            VectorMA(colorout, scale, color, colorout);
         }
     }
     
-    VectorScale(colorout, 255, colorout);
     return;
 }