Right now you're building a photorealistic renderer based on the RGB color model. But suppose you wanted to use this renderer to do real lighting design, i.e., to simulate the way a building would look under various lighting conditions, with different types of paint. Given the ideas we discussed today in class, how might you modify your renderer implementation to model these effects? How would you get the final color values for the pixels?

In class we said that as objects get hotter, their color goes from red to orange to yellow and so forth, going through the color spectrum. Why then have you never seen a green star?