I have a question. I made some models in the same layer, but I don’t know where to place the sun, what’s the corect position and the corect orientation for ray, so my models would be iluminated.
There is no “correct position”. It is up to your artistic creativity where you place a lamp. The thing to remember is that you need the light to hit your model and bounce back to the camera. Here is a blend with a sun lamp pointed at some models. It is by no means good lighting, but they are illuminated at least. Lighting in 3d is the hardest part IMO. Good lighting is rarely achieved with just one light.
sun.blend (256 KB)