In calculations of light distribution using the radiosity process the rays are emitted by the light source and are reflected back by a surface. This process continues with a defined number of iterations and consequently also takes into consideration the light reflecting off other surfaces.
A key advantage of radiosity is the storage of light properties in a grid on the model geometry. In this way, the camera angle can subsequently be changed without requiring a revised calculation.
The disadvantage of radiosity is the effect on the calculation time of details, spheres or complex scenes with a very large number of polygons. A relatively coarse grid of values for quicker calculation, on the other hand, can lead to errors in the light intensity distribution.
Radiosity was one of the first processes used for the calculation of light distribution. Due to the possibility of calculating indirect, diffuse light, this process is now widely used. If it is only the camera angle that changes in the animation of an architectural model, and not the light, the different perspectives require no more than a single calculation.