Example of Radiosity Rendering

Let’s understand the radiosity rendering with a real-life example so that we have a better understanding of how radiosity rendering works in computer graphics:

Example: A Room with Colored Walls:

Imagine that you have a room with four walls which are painted in different colours red Green Blue and white and there is a single light source in the centre of the room and the light source is hanging from the ceiling so let’s understand how we can render this scene using the Radiosity rendering so that we can accurately calculate the distribution of light and colour.

Following are the steps which are involved in radiosity rendering:

1. Scene Division: Till this step, the room is divided into different polygons or patches in this each wall is divided into a grid and each grid contains small elements so if the wall has 100 patches it will have a total of 400 patches for the entire room (a room has 4 walls.)

2. Form Factor Calculation: In this step, we calculate the form factor for each of the pair of patches this is calculated based on the geometric relationship as well as the distance from each other for example if there is a patch on the red wall then it will have a higher form factor with a patch which is on the white wall if they are facing each other directly as compared to if they are at different angles.

3. Matrix Equation: In this step, the reduced equation is set up and it is known as the Matrix Equation in this step we relate the radiosity of each of the patches to the form factors between the patches it contains immediate lights as well as reflected lights this equation is solved iteratively until the radiosity values intersect with each other.

4. Iterative Solution: The radiosity values for each of the patches are calculated iteratively and because it is radiosity rendering then both the direct as well as the indirect light source illumination are considered in this after iteratively solving this the radiosity values stabilise which indicates that we have a solution for the light balance.

5. Rendering: Once the reduced values are determined they are used to calculate the final colour of each patch this step takes into consideration the different material properties such as the colour of the walls etc Then the colour of each patch is computed based on the combination of reflected light as well as the emitted light.

Rendering is the process of generating images which look realistic, these renderings can be based on either 2D rendering or 3D and computer graphics are used when we want to manipulate a set of images in the form of pixels to show to computer devices. Computer graphics is used in many digital types of photography, film, entertainment, and other electronic gadgets.

In this article, we will understand the radiosity rendering in computer graphics in depth.