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;
@@ -82,6 +90,9 @@ struct polygon {
         vec3 result = normals[0] * barycentrics[0] +
                       normals[1] * barycentrics[1] +
                       normals[2] * barycentrics[2];
+        if (result.isSmall())
+            return normals[0];
+        else
             return result.normalize();
     }
 
@@ -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));
     }
 };
 

renderer.hpp

@@ -18,6 +18,7 @@ class Renderer {
     Rendertarget *target;
 
     bool clearTarget = true;
+    vec3 sunDir = vec3(1.0, -1.0, 1.0).normalize();
 
     void toScreenSpace(vec3 *p) {
         p->x() = p->x() / p->z() * decimal(2.0) * decimal(SCREEN_SPACE_SIZE) +
@@ -56,6 +57,7 @@ class Renderer {
         polygon testP;
 
         for (int f = 0; f < model->faces.size(); f += 3) {
+            testP.small = false;
             for (int p = 0; p < 3; p++) {
                 testP.points[p] = verts[std::get<0>(model->faces[f + p])];
                 testP.colors[p] =
@@ -63,6 +65,8 @@ class Renderer {
                 testP.normals[p] =
                     model->normals[std::get<1>(model->faces[f + p])];
             }
+            if ((testP.avgNormal() * vec3(0.0, 0.0, 1.0)) > decimal(0.))
+                continue;
 
             testP.calcDelta();
 
@@ -81,20 +85,19 @@ class Renderer {
             for (int x = startX; x < endX; x++) {
                 for (int y = startY; y < endY; y++) {
                     if (testP.contains(pos)) {
+                        if (testP.small)
+                            continue;
                         vec3 factors = testP.calcBarycentric(pos);
-                        factors = factors.normalize();
                         decimal depth = testP.calcDepth(factors);
                         if (depth < target->getDepth(x, y)) {
                             // std::cout << factors << std::endl;
                             vec3 normal = testP.calcNormal(factors);
                             vec3 color = testP.calcColor(factors);
                             decimal lightFac =
-                                std::max(
-                                    normal *
-                                        (-vec3(1.0, -1.0, 1.0).normalize()),
-                                    decimal(0.0)) +
+                                std::max(normal * (-sunDir), decimal(0.0)) +
                                 decimal(0.5);
-                            target->setDepth(x, y, depth);
+                            // decimal reflection = target->setDepth(x, y,
+                            // depth);
                             target->set(x, y,
                                         (color * decimal(120.0)) * lightFac);