Trying to get the position on the face where the rays intersect the voxel. Some promising first results.

kernels/ray_caster_kernel.cl

@@ -1,5 +1,5 @@
 
-
+// Naive incident ray light
 float4 white_light(float4 input, float3 light, int3 mask) {
 
 	input.w = input.w + acos(
@@ -13,6 +13,45 @@ float4 white_light(float4 input, float3 light, int3 mask) {
 
 }
 
+
+// Phong + diffuse lighting function for g
+
+//  0  1  2  3  4  5  6  7   8   9
+// {r, g, b, i, x, y, z, x', y', z'}
+
+float4 view_light(float4 in_color, float3 light, float3 view, int3 mask) {
+
+	float diffuse = max(dot(normalize(convert_float3(mask)), normalize(light)), 0.0f);
+	in_color += diffuse * 0.5;
+
+	if (dot(light, normalize(convert_float3(mask))) > 0.0)
+	{
+		float3 halfwayVector = normalize(normalize(light) + normalize(view));
+		float specTmp = max(dot(normalize(convert_float3(mask)), halfwayVector), 0.0f);
+		in_color += pow(specTmp, 1.0f) * 0.1;
+	}
+
+	//float3 halfwayDir = normalize(normalize(view) + normalize(light));
+	//float spec = pow(max(dot(normalize(convert_float3(mask)), halfwayDir), 0.0f), 32.0f);
+	in_color += 0.02;
+	return in_color;
+}
+
+
+int rand(int* seed) // 1 <= *seed < m
+{
+	int const a = 16807; //ie 7**5
+	int const m = 2147483647; //ie 2**31-1
+
+	*seed = ((*seed) * a) % m;
+	return(*seed);
+}
+
+
+
+// =================================== Boolean ray intersection ============================
+// =========================================================================================
+
 bool cast_light_intersection_ray(
 	global char* map,
 	global int3* map_dim,
@@ -35,7 +74,7 @@ bool cast_light_intersection_ray(
 	float3 delta_t = fabs(1.0f / ray_dir);
 	
 	// offset is how far we are into a voxel, enables sub voxel movement
-	float3 offset = ((ray_pos) - floor(ray_pos)) * convert_float3(voxel_step);
+	float3 offset = ((ray_pos)-floor(ray_pos)) * convert_float3(voxel_step);
 
 	// Intersection T is the collection of the next intersection points
 	// for all 3 axis XYZ.
@@ -62,13 +101,7 @@ bool cast_light_intersection_ray(
 	// Andrew Woo's raycasting algo
 	do {
 
-		// If we hit a voxel
-		int index = voxel.x + (*map_dim).x * (voxel.y + (*map_dim).z * (voxel.z));
-		int voxel_data = map[index];
 
-		if (voxel_data != 0) {
-			return true;
-		}
 
 		// Fancy no branch version of the logic step
 		face_mask = intersection_t.xyz <= min(intersection_t.yzx, intersection_t.zxy);
@@ -86,7 +119,13 @@ bool cast_light_intersection_ray(
 			return false;
 		}
 
+		// If we hit a voxel
+		int index = voxel.x + (*map_dim).x * (voxel.y + (*map_dim).z * (voxel.z));
+		int voxel_data = map[index];
 
+		if (voxel_data != 0) {
+			return true;
+		}
 
 		dist++;
 
@@ -95,105 +134,94 @@ bool cast_light_intersection_ray(
 	return false;
 }
 
-//  0  1  2  3  4  5  6  7   8   9
+// =================================== float4 of intersected voxel ============================
-// {r, g, b, i, x, y, z, x', y', z'}
+// ============================================================================================
-
-float4 view_light(float4 in_color, float3 light, float3 view, int3 mask) {
-	
-	float diffuse = max(dot(normalize(convert_float3(mask)), normalize(light)), 0.0f);
-	in_color += diffuse * 0.5;
 
-	if (dot(light, normalize(convert_float3(mask))) > 0.0)
+float4 cast_color_ray(
-	{
+	global char* map,
-		float3 halfwayVector = normalize(normalize(light) + normalize(view));
+	global int3* map_dim,
-		float specTmp = max(dot(normalize(convert_float3(mask)), halfwayVector), 0.0f);
+	float3 ray_dir,
-		in_color += pow(specTmp, 1.0f) * 0.01;
+	float3 ray_pos,
-	}
+	global float* lights,
+	global int* light_count
 
-	//float3 halfwayDir = normalize(normalize(view) + normalize(light));
+	) {
-	//float spec = pow(max(dot(normalize(convert_float3(mask)), halfwayDir), 0.0f), 32.0f);
-	in_color += 0.02;
-	return in_color;
-}
 
+	// Setup the voxel step based on what direction the ray is pointing
+	int3 voxel_step = { 1, 1, 1 };
+	voxel_step *= (ray_dir > 0) - (ray_dir < 0);
 
+	// Setup the voxel coords from the camera origin
+	int3 voxel = convert_int3(ray_pos);
 
+	// Delta T is the units a ray must travel along an axis in order to
+	// traverse an integer split
+	float3 delta_t = fabs(1.0f / ray_dir);
 
+	// offset is how far we are into a voxel, enables sub voxel movement
+	float3 offset = ((ray_pos)-floor(ray_pos)) * convert_float3(voxel_step);
 
+	// Intersection T is the collection of the next intersection points
+	// for all 3 axis XYZ.
+	float3 intersection_t = delta_t *offset;
 
+	// for negative values, wrap around the delta_t, rather not do this
+	// component wise, but it doesn't appear to want to work
+	if (intersection_t.x < 0) {
+		intersection_t.x += delta_t.x;
+	}
+	if (intersection_t.y < 0) {
+		intersection_t.y += delta_t.y;
+	}
+	if (intersection_t.z < 0) {
+		intersection_t.z += delta_t.z;
+	}
 
-//  0  1  2  3  4  5  6  7   8   9
+	// Hard cut-off for how far the ray can travel
-// {r, g, b, i, x, y, z, x', y', z'}
+	int max_dist = 800;
+	int dist = 0;
 
-float4 cast_light_rays(
+	int3 face_mask = { 0, 0, 0 };
-	float3 eye_direction, 
-	float3 ray_origin, 
-	float4 voxel_color, 
-	float3 voxel_normal, 
-	global float* lights, 
-	global int* light_count) {
 
-	// set the ray origin to be where the initial ray intersected the voxel
+	// Andrew Woo's raycasting algo
-	// which side z, and the x and y position
+	do {
 
-	float ambient_constant = 0.5;
+		// If we hit a voxel
-	float intensity = 0;
+		int index = voxel.x + (*map_dim).x * (voxel.y + (*map_dim).z * (voxel.z));
+		int voxel_data = map[index];
 
-	for (int i = 0; i < *light_count; i++) {
+		if (voxel_data != 0) {
+			return true;
+		}
 
-		float distance = sqrt(
+		// Fancy no branch version of the logic step
-			pow(lights[10 * i + 4] - ray_origin.x, 2) +
+		face_mask = intersection_t.xyz <= min(intersection_t.yzx, intersection_t.zxy);
-			pow(lights[10 * i + 5] - ray_origin.y, 2) +
+		intersection_t += delta_t * fabs(convert_float3(face_mask.xyz));
-			pow(lights[10 * i + 6] - ray_origin.z, 2));
+		voxel.xyz += voxel_step.xyz * face_mask.xyz;
 
-		if (distance > 50)
+		// If the ray went out of bounds
-			continue;
+		int3 overshoot = voxel < *map_dim;
+		int3 undershoot = voxel >= 0;
 
-		float3 light_direction = (lights[10 * i + 7], lights[10 * i + 8], lights[10 * i + 9]);
+		if (overshoot.x == 0 || overshoot.y == 0 || overshoot.z == 0 || undershoot.x == 0 || undershoot.y == 0) {
-		float c = 10.0;
+			return false;
+		}
+		if (undershoot.z == 0) {
+			return false;
+		}
 
-		//if (dot(light_direction, voxel_normal) > 0.0) {
-			float3 halfwayVector = normalize(light_direction + eye_direction);
-			float dot_prod = dot(voxel_normal, halfwayVector);
-			float specTmp = max((float)dot_prod, 0.0f);
-			intensity += pow(specTmp, c);
-		//}
-	}
 
-	if (get_global_id(0) == 1037760) { 
-		//printf("%f", intensity);
-		voxel_color = (float4)(1.0, 1.0, 1.0, 1.0);
-		return voxel_color;
-	}
 
-	voxel_color.w *= intensity;
+		dist++;
-	voxel_color.w += ambient_constant;
-
-	return voxel_color;
-
-	//	for every light
-	//
-	//		check if the light is within falloff distance
-	//		every unit, light halfs
-	//
-	//		if it is, cast a ray to that light and check for collisions.
-	//			if ray exits voxel volume, assume unobstructed
-	//			
-	//			if ray intersects a voxel, dont influence the voxel color
-	//		
-	//			if it does
-}
 
-int rand(int* seed) // 1 <= *seed < m
+	} while (dist < 700);
-{
-	int const a = 16807; //ie 7**5
-	int const m = 2147483647; //ie 2**31-1
 
-	*seed = ((*seed) * a) % m;
+	return false;
-	return(*seed);
 }
 
 
+// ====================================== Raycaster entry point =====================================
+// ==================================================================================================
 
 __kernel void raycaster(
         global char* map,
@@ -256,7 +284,7 @@ __kernel void raycaster(
 
 	// Intersection T is the collection of the next intersection points
     // for all 3 axis XYZ.
-	float3 intersection_t = delta_t * offset;
+	float3 intersection_t = delta_t * (offset);
 
 	// for negative values, wrap around the delta_t, rather not do this
 	// component wise, but it doesn't appear to want to work
@@ -324,15 +352,62 @@ __kernel void raycaster(
 			// set to which face
 			float3 face_position = convert_float3(face_mask * voxel_step);
 
+			
+			
+			if (face_mask.x * voxel_step.x == -1) {
+
+				float z_percent = (intersection_t.x - (intersection_t.z - delta_t.z)) / delta_t.z;
+				float y_percent = (intersection_t.x - (intersection_t.y - delta_t.y)) / delta_t.y;
+
+				face_position = (float3)(1.0f, y_percent, z_percent);
+
+				if (face_mask.x == 1)
+					face_position *= -1;
+
+			}
+
+			if (face_mask.y * voxel_step.y == -1) {
+
+				float x_percent = (intersection_t.y - (intersection_t.x - delta_t.x)) / delta_t.x;
+				float z_percent = (intersection_t.y - (intersection_t.z - delta_t.z)) / delta_t.z;
+
+				face_position = (float3)(x_percent, 1.0f, z_percent);
+
+				if (face_mask.y == 1)
+					face_position *= -1;
+			}
+		
+			if (face_mask.z * voxel_step.z == -1) {
+				
+				float vx = intersection_t.x - delta_t.x;
+				float vy = intersection_t.y - delta_t.y;
+				float vz = intersection_t.z - delta_t.z;
+
+				float x_percent = (intersection_t.z - (intersection_t.x - delta_t.x)) / delta_t.x;
+				float y_percent = (intersection_t.z - (intersection_t.y - delta_t.y)) / delta_t.y;
+
+				face_position = (float3)(x_percent, y_percent, 1.0f);
+
+				if (face_mask.z == 1)
+					face_position *= -1;
+
+			}
+
+			
 			// set the xy for that face
-			face_position += convert_float3(face_mask == (int3)(0,0,0)) * ((intersection_t) / delta_t);
+			//face_position += 
+			//	convert_float3(face_mask == (int3)(1,1,1))
+			//	convert_float3(face_mask == (int3)(0,0,0)) * (intersection_t - delta_t);
+
+
+
 			//face_position += convert_float3(face_mask == (int3)(0,0,0)) * (rand(&seed) % 10) / 50.0;
 
 			if (cast_light_intersection_ray(
 				map,
 				map_dim,
-				(float3)(lights[4], lights[5], lights[6]) - (convert_float3(voxel)),
+				normalize((float3)(lights[4], lights[5], lights[6]) - (convert_float3(voxel))),
-				(convert_float3(voxel) - convert_float3(face_mask * voxel_step)),//face_position),//
+				(convert_float3(voxel) + face_position),//convert_float3(face_mask * voxel_step)),//face_position),//
 				lights, 
 				light_count
 			)) {

src/Camera.cpp

@@ -126,11 +126,11 @@ void Camera::recieve_event(VrEventPublisher* publisher, std::unique_ptr<vr::Even
 		}
 	}
 
-	else if (event->type == vr::Event::KeyHeld) {
+	else if (event->type == vr::Event::KeyPressed) {
 		
 		vr::KeyPressed *key_event = static_cast<vr::KeyPressed*>(event.get());
 		
-		if (key_event->code == sf::Keyboard::M) {
+		if (key_event->code == sf::Keyboard::Y) {
 			if (mouse_enabled)
 				mouse_enabled = false;
 			else

src/Old_Map.cpp

@@ -139,9 +139,9 @@ void Old_Map::generate_terrain() {
 	}
 
 
-	for (int x = dimensions.x / 2; x < dimensions.x / 2 + dimensions.x / 16; x++) {
+	for (int x = dimensions.x / 2; x < dimensions.x / 2 + dimensions.x / 64; x++) {
-		for (int y = dimensions.x / 2; y < dimensions.y / 2 + dimensions.x / 16; y++) {
+		for (int y = dimensions.x / 2; y < dimensions.y / 2 + dimensions.x / 64; y++) {
-			for (int z = 0; z < 20; z++) {
+			for (int z = 0; z < 5; z++) {
 
 				voxel_data[x + dimensions.x * (y + dimensions.z * z)] = 6;
 			}

src/main.cpp

@@ -162,6 +162,7 @@ int main() {
 	Input input_handler;
 
 	camera->subscribe_to_publisher(&input_handler, vr::Event::EventType::KeyHeld);
+	camera->subscribe_to_publisher(&input_handler, vr::Event::EventType::KeyPressed);
 	camera->subscribe_to_publisher(&input_handler, vr::Event::EventType::MouseMoved);
 
 	WindowHandler win_hand(&window);
@@ -181,14 +182,15 @@ int main() {
 		if (sf::Keyboard::isKeyPressed(sf::Keyboard::Dash)) {
 			raycaster->test_edit_viewport(WINDOW_X, WINDOW_Y, w -= 5, h -= 5);
 		}
-		if (sf::Keyboard::isKeyPressed(sf::Keyboard::L)) {
+		if (sf::Keyboard::isKeyPressed(sf::Keyboard::LAlt)) {
 			light_vec.at(0).position = camera->get_position();
+			light_vec.at(0).direction_cartesian = SphereToCart(camera->get_direction());
 		}
-		if (sf::Keyboard::isKeyPressed(sf::Keyboard::N)) {
+		if (sf::Keyboard::isKeyPressed(sf::Keyboard::O)) {
 			light_vec.at(0).orbit_around_center(timer_accumulator += delta_time);
 		}
 
-		if (sf::Keyboard::isKeyPressed(sf::Keyboard::N)) {
+		if (sf::Keyboard::isKeyPressed(sf::Keyboard::M)) {
 			std::string path = "../assets/";
 			std::string filename;
 			std::getline(std::cin, filename);