Fixed brick code which caused memory override for mesh data and fucked up rendering

src/mesh.cpp

@@ -42,6 +42,7 @@ BEGIN_NAMESPACE
 
         // fill in buffer
         size_t i = 0;
+        size_t face_index = 0;
         for (auto& f: facets) {
             for (int j = 0; j < 3; j++) {
                 vbo_data[i++] = vertices[f.vertices[j]].position.x;
@@ -59,6 +60,7 @@ BEGIN_NAMESPACE
                 vbo_data[i++] = f.text_coords[j].x;
                 vbo_data[i++] = f.text_coords[j].y;
             }
+            face_index++;
         }
 
         glBindVertexArray(vao_id);