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examples/04_phase5_test/main.cpp

@@ -3,6 +3,7 @@
  * @brief Phase 5 verification program - CPU ray tracing test (RGBA16F output)
  */
 
+#include <iostream>
 #include <are/core/config.h>
 #include <are/core/logger.h>
 #include <are/core/profiler.h>
@@ -265,9 +266,9 @@ void main() {
 	rtc.backend = RayTracingBackend::ARE_RT_BACKEND_CPU;
 	rtc.spp = 1;
 	rtc.max_depth = 4;
-	rtc.enable_gi = true;
+	rtc.enable_gi = false;
-	rtc.enable_ao = true;
+	rtc.enable_ao = false;
-	rtc.ao_samples = 8;
+	rtc.ao_samples = 1;
 	rtc.ao_radius = 1.0f;
 
 	CPURayTracer tracer(rtc);
@@ -283,6 +284,7 @@ void main() {
 	bool request_render = true;
 
 	while (!window.should_close()) {
+		std::cout << "RENDERING" << std::endl;
 		window.poll_events();
 
 		if (window.is_key_pressed(256)) {
@@ -314,14 +316,24 @@ void main() {
 		int new_fb_w = 0;
 		int new_fb_h = 0;
 		window.get_framebuffer_size(new_fb_w, new_fb_h);
+
+		// If minimized / invalid size: keep window responsive, skip rendering
+		if (new_fb_w <= 0 || new_fb_h <= 0) {
+			window.swap_buffers();
+			continue;
+		}
+
 		if (new_fb_w != fb_w || new_fb_h != fb_h) {
 			fb_w = new_fb_w;
 			fb_h = new_fb_h;
+
 			rasterizer.resize(fb_w, fb_h);
 
 			glDeleteTextures(1, &output_tex);
 			output_tex = create_output_texture_rgba16f(fb_w, fb_h);
 
+			camera.set_aspect_ratio(static_cast<Real>(fb_w) / static_cast<Real>(fb_h));
+
 			request_render = true;
 		}
 

src/raytracer/cpu_raytracer.cpp

@@ -163,47 +163,35 @@ Vec3 CPURayTracer::trace_ray(const Ray& ray, int depth) {
 }
 
 Vec3 CPURayTracer::shade(const HitRecord& hit, const Ray& ray, int depth) {
-    ARE_PROFILE_FUNCTION();
-
     Vec3 albedo(0.8f);
-    Real metallic = 0.0f;
-    Real roughness = 0.5f;
-
     if (scene_) {
         const Material* mat = scene_->get_material(hit.material_);
         if (mat) {
             albedo = mat->get_albedo();
-            metallic = mat->get_metallic();
-            roughness = mat->get_roughness();
         }
     }
 
     Vec3 direct = compute_direct_lighting(hit);
     Real ao = 1.0f;
-
     if (config_.enable_ao) {
         ao = compute_ambient_occlusion(hit);
     }
 
-    Vec3 result = direct * ao;
+    // Direct term (Lambert)
+    Vec3 Lo = albedo * direct * ao;
 
+    // Diffuse GI (cosine-weighted)
     if (config_.enable_gi && depth > 1) {
         RandomGenerator& rng = get_thread_random();
         Vec3 bounce_dir = rng.random_cosine_direction(hit.normal_);
         Ray bounce_ray(offset_ray_origin(hit.position_, hit.normal_), bounce_dir, are_epsilon, 1e30f);
 
-        Vec3 bounced = trace_ray(bounce_ray, depth - 1);
+        Vec3 Li = trace_ray(bounce_ray, depth - 1);
-        result += albedo * bounced * 0.5f;
+        Lo += albedo * Li;
     }
 
-    // Phase 5: Lambert base
-    result *= albedo;
-
     (void)ray;
-    (void)metallic;
+    return Lo;
-    (void)roughness;
-
-    return result;
 }
 
 Vec3 CPURayTracer::compute_direct_lighting(const HitRecord& hit) {