Global Illumination Model

Question

Describe in brief the term Global Illumination Model?

Answer 1

Global Illumination Model:

Global illumination model adds up to the local model the light which is reflected from the other surfaces to the present surface. The global illumination model is much comprehensive, more physically accurate and generates more realistic images. It is as well more computationally costly. In a global illumination model, the reflection of light from a surface is modeled as in the local model with the addition of light incident on the surface after the multiple reflections among other surfaces. Though the model is computationally more intensive than a local model however attainment of realism via this model is fairly possible.