fix: Correct mesh normal transformation and floor shadow renderingHEADmain

1 files changed, 28 insertions, 5 deletions

diff --git a/src/tests/test_mesh.cc b/src/tests/test_mesh.cc
index 0294d9b..f29ec27 100644
--- a/src/tests/test_mesh.cc
+++ b/src/tests/test_mesh.cc
@@ -169,7 +169,15 @@ bool load_obj_and_create_buffers(const char* path, Object3D& out_obj) {
                 std::string parts[3] = {s1, s2, s3};
                 RawFace face = {};
                 for (int i = 0; i < 3; ++i) {
-                  sscanf(parts[i].c_str(), "%d/%d/%d", &face.v[i], &face.vt[i], &face.vn[i]);
+                  // Handle v//vn format
+                  if (parts[i].find("//") != std::string::npos) {
+                    sscanf(parts[i].c_str(), "%d//%d", &face.v[i], &face.vn[i]);
+                    face.vt[i] = 0;
+                  } else {
+                    int res = sscanf(parts[i].c_str(), "%d/%d/%d", &face.v[i], &face.vt[i], &face.vn[i]);
+                    if (res == 2) face.vn[i] = 0;
+                    else if (res == 1) { face.vt[i] = 0; face.vn[i] = 0; }
+                  }
                 }
                 raw_faces.push_back(face);
             }
@@ -213,6 +221,21 @@ bool load_obj_and_create_buffers(const char* path, Object3D& out_obj) {
     }
 
     if (final_vertices.empty()) return false;
+
+    // Calculate AABB and center the mesh
+    float min_x = 1e10f, min_y = 1e10f, min_z = 1e10f;
+    float max_x = -1e10f, max_y = -1e10f, max_z = -1e10f;
+    for (const auto& v : final_vertices) {
+        min_x = std::min(min_x, v.p[0]); min_y = std::min(min_y, v.p[1]); min_z = std::min(min_z, v.p[2]);
+        max_x = std::max(max_x, v.p[0]); max_y = std::max(max_y, v.p[1]); max_z = std::max(max_z, v.p[2]);
+    }
+    float cx = (min_x + max_x) * 0.5f;
+    float cy = (min_y + max_y) * 0.5f;
+    float cz = (min_z + max_z) * 0.5f;
+    for (auto& v : final_vertices) {
+        v.p[0] -= cx; v.p[1] -= cy; v.p[2] -= cz;
+    }
+    out_obj.local_extent = vec3((max_x - min_x) * 0.5f, (max_y - min_y) * 0.5f, (max_z - min_z) * 0.5f);
     
     g_mesh_gpu_data.num_indices = final_indices.size();
     g_mesh_gpu_data.vertex_buffer = gpu_create_buffer(g_device, final_vertices.size() * sizeof(MeshVertex), WGPUBufferUsage_Vertex | WGPUBufferUsage_CopyDst, final_vertices.data()).buffer;
@@ -261,7 +284,7 @@ int main(int argc, char** argv) {
 
   // --- Create Scene ---
   Object3D floor(ObjectType::PLANE);
-  floor.scale = vec3(20.0f, 1.0f, 20.0f);
+  floor.scale = vec3(20.0f, 0.01f, 20.0f); // Very thin floor proxy
   floor.color = vec4(0.5f, 0.5f, 0.5f, 1.0f);
   g_scene.add_object(floor);
 
@@ -271,11 +294,11 @@ int main(int argc, char** argv) {
       return 1;
   }
   mesh_obj.color = vec4(1.0f, 0.7f, 0.2f, 1.0f);
-  mesh_obj.position = {0, 1, 0};
+  mesh_obj.position = {0, 1.5, 0}; // Elevate a bit more
   g_scene.add_object(mesh_obj);
   
   g_camera.position = vec3(0, 3, 5);
-  g_camera.target = vec3(0, 1, 0);
+  g_camera.target = vec3(0, 1.5, 0);
 
   while (!platform_should_close(&platform_state)) {
     platform_poll(&platform_state);
@@ -287,7 +310,7 @@ int main(int argc, char** argv) {
     
     if (debug_mode) {
         auto* vertices = (std::vector<MeshVertex>*)g_scene.objects[1].user_data;
-        g_renderer.GetVisualDebug().add_mesh_normals(g_scene.objects[1].get_model_matrix(), vertices->size(), vertices->data());
+        g_renderer.GetVisualDebug().add_mesh_normals(g_scene.objects[1].get_model_matrix(), (uint32_t)vertices->size(), vertices->data());
     }
 
     WGPUSurfaceTexture surface_tex;