We can divide materials into two categories: reflective light materials versus emissive light materials, the moon belong to the first one and the sun to the second. This tutorial explore how to create self-illuminated or emissive materials, basically materials that behave like light sources. Two methods will be explained and compared: Global illumination and materials with high diffused color values or mesh lighting, pros and cons will be highlighted, exposure problems can be solved during compositing:
Note: another more in-depth self illumination tutorial will be published in the near future !