Hi everyone,
I'm trying to create a class to manage my camera for my ray tracer. I've got field of view, aspect ratio, a look direction, an up direction and a right direction, but I don't know how to translate this into ray directions which I can shoot from my camera position - can anyone help? I think some example code would help me best!
Thanks :)
dir=right*x+up*y+lookdir;
x and y are -1 to 1, mapped from the screen pixel coordinate. if you want to apply the fov, simply multiply x and y by the horizontal respectably vertical fov.
yes, it's that easy to start :)
float x_ = ((float)(-pixels_x/2 + x))/pixels_x;
float y_ = ((float)(-pixels_y/2 + y))/pixels_y;
float dx = x_*physical_window_width;
float dy = y_*physical_window_height;
float dz = z_physical_distance_to_screen;
ray.origin.x = cameraPos.x + cameraLeft.x*dx + cameraUp.x*dy;
ray.origin.y = cameraPos.y + cameraLeft.y*dx + cameraUp.y*dy;
ray.origin.z = cameraPos.z + cameraLeft.z*dx + cameraUp.z*dy;
ray.direction.x = cameraLeft.x*dx + cameraUp.x*dy + cameraDir.x*dz;
ray.direction.y = cameraLeft.y*dx + cameraUp.y*dy + cameraDir.y*dz;
ray.direction.z = cameraLeft.z*dx + cameraUp.z*dy + cameraDir.z*dz;
normalize(&ray.direction);
OK, it's working :) I'm also interested in the proper way to shade pixels - do people use the phong model? What's the proper way to combine refraction, reflection and surface colours?
