Simple Normals Rendering

Math/private/Camera.cpp

@@ -2,19 +2,17 @@
 
 using namespace tp;
 
-Camera::Camera() {
-	lookAtPoint({ 0, 0, 0 }, { 2, 0, 0 }, { 0, 0, 1 });
-}
+Camera::Camera() { lookAtPoint({0, 0, 0}, {2, 0, 0}, {0, 0, 1}); }
 
-Vec3F Camera::getTarget() const { return mTarget; }
+const Vec3F& Camera::getTarget() const { return mTarget; }
 
 void Camera::offset_target(halnf val) { mTarget += (mPos - mTarget).normalize() * val; }
 
 Vec3F Camera::getForward() const { return (mTarget - mPos).normalize(); }
 
-Vec3F Camera::getUp() const { return mUp; }
+const Vec3F& Camera::getUp() const { return mUp; }
 
-Vec3F& Camera::getPos() { return mPos; }
+const Vec3F& Camera::getPos() const { return mPos; }
 
 halnf Camera::getFar() const { return mFar; }
 
@@ -26,11 +24,11 @@ void Camera::setRatio(halnf in) { mRatio = in; }
 
 void Camera::setFOV(halnf in) { mFOV = in; }
 
+void Camera::setFar(halnf in) { mFar = in; }
+
 halnf Camera::getFOV() const { return mFOV; }
 
-Mat4F Camera::calculateTransformationMatrix() {
-	return calculateProjectionMatrix() * calculateViewMatrix();
-}
+Mat4F Camera::calculateTransformationMatrix() { return calculateProjectionMatrix() * calculateViewMatrix(); }
 
 Mat4F Camera::calculateViewMatrix() {
   const Vec3F& F = (mPos - mTarget).unitV();
@@ -85,7 +83,9 @@ Vec2F Camera::project(const tp::Vec3F& world, const tp::Mat4F& viewMat, const tp
 }
 
 void Camera::lookAtPoint(const Vec3F& aTarget, const Vec3F& aPos, Vec3F aUp) {
-	if (aTarget == aPos) return;
+  if (aTarget == aPos) {
+    return;
+  }
   mPos = aPos;
   mTarget = aTarget;
   Vec3F f = (mPos - mTarget).normalize();

Math/private/Topology.cpp

@@ -95,3 +95,6 @@ void Topology::updateTransformed() {
 		mTrigCaches[idx].updateCache(mPointsTransformed);
 	}
 }
+
+const Buffer<TrigCache>& Topology::getTrigs() const { return mTrigCaches; }
+

Math/public/Camera.hpp

@@ -17,11 +17,12 @@ namespace tp {
 
     void setRatio(halnf ratio);
     void setFOV(halnf fov);
+    void setFar(halnf far);
 
-		[[nodiscard]] Vec3F& getPos();
-		[[nodiscard]] Vec3F getTarget() const;
+    [[nodiscard]] const Vec3F& getPos() const;
+    [[nodiscard]] const Vec3F& getTarget() const;
     [[nodiscard]] Vec3F getForward() const;
-		[[nodiscard]] Vec3F getUp() const;
+    [[nodiscard]] const Vec3F& getUp() const;
     [[nodiscard]] halnf getRatio() const;
     [[nodiscard]] halnf getFOV() const;
     [[nodiscard]] halnf getFar() const;
@@ -41,6 +42,5 @@ namespace tp {
     [[nodiscard]] Vec3F project(Vec2F normalized);
     [[nodiscard]] Vec2F project(const Vec3F& world);
     [[nodiscard]] static Vec2F project(const tp::Vec3F& world, const tp::Mat4F& viewMat, const tp::Mat4F& projMat);
-
   };
 }

Math/public/Topology.hpp

@@ -44,5 +44,6 @@ namespace tp {
 		void addTrig(const Vec3F& v1, const Vec3F& v2, const Vec3F& v3);
 		void transformPoint(Vec3F& vert);
 		void updateTransformed();
+    [[nodiscard]] const Buffer<TrigCache>& getTrigs() const;
 	};
 }

RayTracer/applications/Rayt.cpp

@@ -4,6 +4,7 @@
 #include "Buffer.hpp"
 #include "RayTracer.hpp"
 #include "Strings.hpp"
+#include "Timing.hpp"
 #include "Vec.hpp"
 
 #include "OBJ_Loader.h"
@@ -71,13 +72,24 @@ void renderCommand(const String& scenePath, RayTracer::RenderBuffer::Index2D siz
 
   loadScene(scene, scenePath);
 
+  scene.mCamera.lookAtPoint({0, 0, 0}, {-3, -3, 3}, {1, 1, 1});
+  scene.mCamera.setFOV(3.14 / 4);
+  scene.mCamera.setRatio((halnf) size.y / (halnf) size.x);
+  scene.mCamera.setFar(100);
+
   RayTracer::RenderBuffer output;
   output.reserve(size);
 
   RayTracer rayt;
 
+  auto start = get_time();
+
   rayt.render(scene, output);
 
+  auto end = get_time();
+
+  printf("\n Render finished with average render time per sample - %i (ms)\n", end - start);
+
   writeImage(output);
 }
 
@@ -86,7 +98,7 @@ int main() {
   tp::ModuleManifest module("Rayt", nullptr, nullptr, deps);
 
   if (module.initialize()) {
-    renderCommand("scene.obj", {1000, 1000});
+    renderCommand("scene.obj", {600, 600});
 
     module.deinitialize();
   }

RayTracer/applications/rsc/scene.mtl

@@ -1,12 +1,10 @@
 # Blender MTL File: 'None'
 # Material Count: 1
 
-newmtl Material
-Ns 323.999994
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
+newmtl None
+Ns 500
+Ka 0.8 0.8 0.8
+Kd 0.8 0.8 0.8
+Ks 0.8 0.8 0.8
+d 1
 illum 2

RayTracer/private/RayTracer.cpp

@@ -1,9 +1,14 @@
 
+#include "MathCommon.hpp"
 #include "NewPlacement.hpp"
 
 #include "CommandLine.hpp"
 #include "Module.hpp"
+#include "Ray.hpp"
 #include "RayTracer.hpp"
+#include "TypeInfo.hpp"
+
+#include <cstdio>
 
 using namespace tp;
 
@@ -11,10 +16,79 @@ ModuleManifest* sDependencies[] = {&gModuleMath, &gModuleCommandLine, &gModuleCo
 
 ModuleManifest tp::gModuleRayTracer = ModuleManifest("RayTracer", nullptr, nullptr, sDependencies);
 
+void RayTracer::castRay(const Ray& ray, RayCastData& out, alnf far) {
+  out.hit = false;
+
+  far *= far;
+
+  for (auto obj : mScene->mObjects) {
+    for (auto trig : obj->getTrigs()) {
+      if (trig->castRay(ray)) {
+        // printf("Hit\n");
+
+        auto dist = (trig->getHitPos() - ray.pos).length2();
+
+        if (far > dist) {
+          out.trig = &trig.data();
+          out.hitPos = trig->getHitPos();
+          out.obj = &obj.data();
+          out.hit = true;
+
+          far = dist;
+        }
+      }
+    }
+  }
+}
+
 void RayTracer::render(const Scene& scene, RayTracer::RenderBuffer& buff) {
+  mScene = &scene;
+  mBuff = &buff;
+
+  auto pos = mScene->mCamera.getPos();
+  auto fov = mScene->mCamera.getFOV();
+  auto height = sqrt(mScene->mCamera.getRatio());
+  auto width = 1.f / height;
+  auto forward = mScene->mCamera.getForward();
+  auto up = mScene->mCamera.getUp();
+  auto right = forward.cross(up);
+  auto planeCenter = pos + (forward * halnf(width / (2.f * tan(fov / 2.f))));
+  auto planeCenterOffset = (up * (halnf) height / 2.f) - (right * (halnf) width / 2.f);
+
+  auto planeLeftTop = planeCenter + planeCenterOffset;
+
+  RayCastData castData;
+
+  Ray ray = {
+      {0, 0, 0},
+      pos
+  };
+
+  Vec3F iterPoint = {0, 0, 0};
+  Vec3F deltaX = right * halnf(width / (alnf) buff.size().x);
+  Vec3F deltaY = up * halnf(-height / (alnf) buff.size().y);
+
   for (RayTracer::RenderBuffer::Index i = 0; i < buff.size().x; i++) {
     for (RayTracer::RenderBuffer::Index j = 0; j < buff.size().y; j++) {
-      buff.set({i, j}, RGBA(1.f, 1.f, 1.f, 1.f));
+      iterPoint = planeLeftTop + ((deltaX * (halnf) i) + (deltaY * (halnf) j));
+
+      ray.dir = (iterPoint - pos).unitV();
+
+      castRay(ray, castData, mScene->mCamera.getFar());
+
+      if (castData.hit) {
+        auto normal = castData.trig->getNormal();
+        normal.normalize();
+
+        RGBA col = {normal.x * 0.5f + 0.5f, normal.y * 0.5f + 0.5f, normal.z * 0.5f + 0.5f, 1.f};
+        auto depth = 1 - clamp((halnf) (castData.hitPos - ray.pos).length(), 0.f, mScene->mCamera.getFar()) / mScene->mCamera.getFar();
+
+        // buff.set({i, j}, {depth, depth, depth, 1.f});
+        buff.set({i, j}, col);
+
+      } else {
+        buff.set({i, j}, RGBA(0.f, 0.f, 0.f, 0.f));
+      }
     }
   }
 }

RayTracer/public/RayTracer.hpp

@@ -6,17 +6,21 @@
 #include "Color.hpp"
 #include "Module.hpp"
 #include "Topology.hpp"
+#include "Vec.hpp"
 
 namespace tp {
 
   extern ModuleManifest gModuleRayTracer;
 
   class Scene {
+  public:
+    typedef Topology Object;
+
   public:
     Scene() = default;
 
   public:
-    Buffer<Topology> mObjects;
+    Buffer<Object> mObjects;
     Camera mCamera;
   };
 
@@ -24,8 +28,28 @@ namespace tp {
   public:
     typedef Buffer2D<RGBA> RenderBuffer;
 
+    struct RenderSettings {
+      alni samplesiPerPixel = 1;
+      alni rayBounces = 1;
+    };
+
   public:
     RayTracer() = default;
     void render(const Scene& scene, RenderBuffer& buff);
+
+  private:
+    struct RayCastData {
+      const Scene::Object* obj = nullptr;
+      TrigCache* trig = nullptr;
+      Vec3F hitPos = {0, 0, 0};
+      bool hit = false;
+    };
+
+    void castRay(const Ray& ray, RayCastData& out, alnf far);
+
+  private:
+    RenderSettings mSettings;
+    const Scene* mScene = nullptr;
+    RenderBuffer* mBuff = nullptr;
   };
 }