feat: Add seamless bump mapping with procedural noise

- Replaced white noise with smooth value-like noise.
- Implemented periodic texture generation (seam blending).
- Integrated bump mapping into Renderer3D using finite difference of displaced SDF.
- Updated test_3d_render with noise texture and multiple SDF shapes (Box, Sphere, Torus).

1 files changed, 5 insertions, 4 deletions

diff --git a/src/tests/test_3d.cc b/src/tests/test_3d.cc
index 33e6a04..88b8db9 100644
--- a/src/tests/test_3d.cc
+++ b/src/tests/test_3d.cc
@@ -33,10 +33,10 @@ void test_object_transform() {
   std::cout << "Testing Object Transform..." << std::endl;
   Object3D obj;
   obj.position = vec3(10, 0, 0);
-  
+
   // Model matrix should translate by (10,0,0)
   mat4 m = obj.get_model_matrix();
-  assert(near(m.m[12], 10.0f)); // Col 3, Row 0 is x translation in Col-Major? 
+  assert(near(m.m[12], 10.0f)); // Col 3, Row 0 is x translation in Col-Major?
   // Wait, my mat4 struct:
   // r.m[12] = t.x; // Index 12 is translation X
   assert(near(m.m[12], 10.0f));
@@ -44,11 +44,12 @@ void test_object_transform() {
   // Rotate 90 deg Y
   obj.rotation = quat::from_axis(vec3(0, 1, 0), 1.570796f);
   m = obj.get_model_matrix();
-  
+
   // Transform point (1,0,0) -> Rot(0,0,-1) -> Trans(10,0,-1)
   vec4 p(1, 0, 0, 1);
   vec4 res = m * p;
-  assert(near(res.x, 10.0f)); // Rotated vector is (0,0,-1). + (10,0,0) translation -> (10,0,-1)
+  assert(near(res.x, 10.0f)); // Rotated vector is (0,0,-1). + (10,0,0)
+                              // translation -> (10,0,-1)
   assert(near(res.z, -1.0f));
 }