feat: added lighting

polygon.hpp

@@ -58,6 +58,14 @@ struct polygon {
             small = true;*/
     }
 
+    vec3 avgNormal() {
+        vec3 result;
+        for (int i = 0; i++; i < 3) {
+            result += normals[i];
+        }
+        return result * decimal(0.3333);
+    }
+
     const bool contains(const vec3 &p) {
         // if (skip)
         //    return false;
@@ -82,7 +90,10 @@ struct polygon {
         vec3 result = normals[0] * barycentrics[0] +
                       normals[1] * barycentrics[1] +
                       normals[2] * barycentrics[2];
-        return result.normalize();
+        if (result.isSmall())
+            return normals[0];
+        else
+            return result.normalize();
     }
 
     vec3 calcColor(vec3 barycentrics) {
@@ -97,8 +108,8 @@ struct polygon {
     }
 
     vec3 calcBarycentric(vec3 s) {
-        if (small)
-            return vec3(decimal(0.333), decimal(0.333), decimal(0.333));
+        // if (small)
+        //     return vec3(decimal(0.333), decimal(0.333), decimal(0.333));
         vec3 result;
         result[0] = (points[1].x() - s.x()) * (points[2].y() - s.y()) -
                     (points[2].x() - s.x()) * (points[1].y() - s.y());
@@ -106,7 +117,9 @@ struct polygon {
                     (points[0].x() - s.x()) * (points[2].y() - s.y());
         result = result * baryFactor;
         result[2] = decimal(1.0) - result[1] - result[0];
-        return result;
+        // return result;
+        return vec3::max(vec3::min(result, vec3(1.0, 1.0, 1.0)),
+                         vec3(0.0, 0.0, 0.0));
     }
 };