1 files changed, 57 insertions, 0 deletions
diff --git a/src/Engine/Scene.cpp b/src/Engine/Scene.cpp
new file mode 100644
index 0000000..f92dc68
--- /dev/null
+++ b/src/Engine/Scene.cpp
@@ -0,0 +1,57 @@
+#include "Scene.h"
+
+namespace Donut
+{
+    Scene::Scene() 
+        : m_LightPos(5.0f, 5.0f, 5.0f) { }
+
+    glm::vec3 Scene::Trace(Ray &ray)
+    {
+        float closest = std::numeric_limits<float>::infinity();
+        const Object* hitObj = nullptr;
+
+        for(auto& obj : objs)
+        {
+            float t;
+
+            if(obj.Intersect(ray, t))
+                if(t < closest) 
+                {
+                    closest = t;
+                    hitObj = &obj;
+                }
+        }
+        
+        if(hitObj)
+        {
+            glm::vec3 hitPoint = ray.m_Origin + ray.m_Direction * closest;
+            glm::vec3 normal = hitObj->GetNormal(hitPoint);
+            glm::vec3 lightDir = glm::normalize(m_LightPos - hitPoint);
+
+            float diff = std::max(glm::dot(normal, lightDir), 0.0f);
+
+            Ray shadowRay(hitPoint + normal * 0.001f, lightDir);
+            bool inShadow = false;
+            
+            for(auto& obj : objs) 
+            {
+                float t;
+
+                if(obj.Intersect(shadowRay, t)) 
+                {
+                    inShadow = true;
+                    break;
+                }
+            }
+
+            glm::vec3 color = hitObj->m_Material.m_Color;
+            float ambient = 0.1f;
+
+            if (inShadow) 
+                return color * ambient;
+            return color * (ambient + diff * 0.9f);
+        }
+
+        return glm::vec3(0.0f, 0.0f, 0.1f); 
+    }
+}