Topic idea:- Volume Rendering 

Question:- What is rendering in graphics? How does volume rendering work?

Answer:-Rendering or image is the process of generating a photorealistic or non-photorealistic image from a 2D or 3D model by means of a computer program. The data contained in the scene file is then passed to a rendering program to be processed and output to a digital image or raster graphics image file.

In this technique, a ray is generated for each desired image pixel. Using a simple camera model, the ray starts at the center of projection of the camera and passes through the image pixel on the imaginary image plane floating in between the camera and the volume to be rendered.