There we go! The raycaster now has a camera that renders without distortion and can be pitched, yawed, and moved on the XYZ axis. I'm not sure now if I want to: Add lighting, improve performance, or start working on porting it to OpenCL

src/Ray.cpp

@@ -38,17 +38,17 @@ sf::Color Ray::Cast() {
     // Delta T is the units a ray must travel along an axis in order to
     // traverse an integer split
     delta_t = sf::Vector3<float>(
-            fabsf(1.0f / direction.x),
-            fabsf(1.0f / direction.y),
-            fabsf(1.0f / direction.z)
+        fabsf(1.0f / direction.x),
+        fabsf(1.0f / direction.y),
+        fabsf(1.0f / direction.z)
     );
 
     // Intersection T is the collection of the next intersection points
     // for all 3 axis XYZ.
     intersection_t = sf::Vector3<float>(
-            delta_t.x + origin.x,
-            delta_t.y + origin.y,
-            delta_t.z + origin.z
+        delta_t.x,
+        delta_t.y,
+        delta_t.z
     );
 
     int dist = 0;
@@ -99,7 +99,8 @@ sf::Color Ray::Cast() {
         }
 
         // If we hit a voxel
-        switch (map->list[voxel.x + dimensions.x * (voxel.y + dimensions.z * voxel.z)]) {
+        int index = voxel.x + dimensions.x * (voxel.y + dimensions.z * voxel.z);
+        switch (map->list[index]) {
             case 1:
                 return sf::Color::Red;
             case 2:
@@ -107,11 +108,11 @@ sf::Color Ray::Cast() {
             case 3:
                 return sf::Color::Yellow;
             case 4:
-                return sf::Color(40, 230, 96, 200);
+                return sf::Color(80, 0, 150, 255);
             case 5:
-                return sf::Color(80, 120, 96, 100);
+                return sf::Color(255, 120, 255, 255);
             case 6:
-                return sf::Color(150, 80, 220, 200);
+                return sf::Color(150, 80, 220, 255);
         }
 
         dist++;

src/RayCaster.cpp

@@ -20,23 +20,48 @@ RayCaster::RayCaster(
 	resolution = viewport_resolution;
 	image = new sf::Color[resolution.x * resolution.y];
 
+
     // Calculate the view plane vectors
+    // Because casting to individual pixels causes barrel distortion,
+    // Get the radian increments
+    // Set the camera origin
+    // Rotate the ray by the specified pixel * increment
+
+    double y_increment_radians = DegreesToRadians(50.0 / resolution.y);
+    double x_increment_radians = DegreesToRadians(80.0 / resolution.x);
+
     view_plane_vectors = new sf::Vector3f[resolution.x * resolution.y];
     for (int y = -resolution.y / 2 ; y < resolution.y / 2; y++) {
         for (int x = -resolution.x / 2; x < resolution.x / 2; x++) {
-            view_plane_vectors[(x + resolution.x / 2) + resolution.x * (y + resolution.y / 2)] = Normalize(sf::Vector3f(view_plane_distance, x, y));
+
+            // The base ray direction to slew from
+            sf::Vector3f ray(1, 0, 0);
+
+            // Y axis, pitch
+            ray = sf::Vector3f(
+                    ray.z * sin(y_increment_radians * y) + ray.x * cos(y_increment_radians * y),
+                    ray.y,
+                    ray.z * cos(y_increment_radians * y) - ray.x * sin(y_increment_radians * y)
+            );
+
+            // Z axis, yaw
+            ray = sf::Vector3f(
+                    ray.x * cos(x_increment_radians * x) - ray.y * sin(x_increment_radians * x),
+                    ray.x * sin(x_increment_radians * x) + ray.y * cos(x_increment_radians * x),
+                    ray.z
+            );
+
+            int index = (x + resolution.x / 2) + resolution.x * (y + resolution.y / 2);
+            view_plane_vectors[index] = Normalize(ray);
         }
     }
 }
 
-
 RayCaster::~RayCaster() {
     delete image;
     delete view_plane_vectors;
 }
 
-
-
 sf::Color* RayCaster::CastRays(sf::Vector3<float> camera_direction, sf::Vector3<float> camera_position) {
 
     // Setup the camera for this cast
@@ -44,7 +69,6 @@ sf::Color* RayCaster::CastRays(sf::Vector3<float> camera_direction, sf::Vector3<
     camera_direction_cartesian = Normalize(SphereToCart(camera_direction));
     this->camera_position = camera_position;
 
-
     // Start the loop at the top left, scan right and work down
     for (int y = 0; y < resolution.y; y++) {
         for (int x = 0; x < resolution.x; x++) {
@@ -73,7 +97,7 @@ sf::Color* RayCaster::CastRays(sf::Vector3<float> camera_direction, sf::Vector3<
             Ray r(map, resolution, sf::Vector2i(x, y), camera_position, ray);
 
             // Cast it and assign its return value
-            image[x + resolution.x*y] = r.Cast();
+            image[x + resolution.x * y] = r.Cast();
         }
     }
 

src/main.cpp

@@ -6,8 +6,8 @@
 #include "RayCaster.h"
 #include <Map.h>
 
-const int WINDOW_X = 400;
-const int WINDOW_Y = 400;
+const int WINDOW_X = 600;
+const int WINDOW_Y = 600;
 
 
 float elap_time(){
@@ -52,7 +52,7 @@ int main() {
 	window_sprite.setPosition(0, 0);
 
 	// State values
-	sf::Vector3i map_dim(100, 100, 100);
+	sf::Vector3i map_dim(200, 200, 200);
 	sf::Vector2i view_res(WINDOW_X, WINDOW_Y);
 	sf::Vector3f cam_dir(1.0f, 0.0f, 1.57f);
 	sf::Vector3f cam_pos(50, 50, 50);