If camera.x, camera.y, camera.z, camera.pan, camera.tilt, camera.roll are all set to 0, then which axis points where?

ok whatever, i solved it. but how do you clear the screen? I want it clear the screen to black right before I render every frame. How do I do that?

Whatever, I solved it again, I just needed to set sky_color.red blue green to 1 instead of 0.