Hi, everyone today we are going to discuss the difference between Scanline Rendering and Raytracing Rendering. As we have already discussed in our previous blog about the rendering.

Brief of 3D Rendering:

3D Rendering is the term from computer graphics, which indicates the process of visualization, imaging, or creation of models with the help of a computer 3D program. Rendering is very common nowadays for every 3d artist. Today as we see it is a very cost-effective option for the conception of the designs.

Differences between 3D Rendering:

Scanline Rendering:

It is an algorithm for visible surface determination, in 3D computer graphics that works on a row-by-row basis rather than polygon-by-polygon or pixel-by-pixel basis. The scanline renderer passes a ray from the camera through every pixel of the rendered images. If the ray crosses a mesh face, the color of the pixel is calculated according to the light sources, their angle to the normal of the face, the angle of the camera to that face, and some other information. If no face is encountered, the pixel gets the color of the background. In this manner, the renderer scans all pixel lines after line.

Raytracing Rendering:

It is a specific type of rendering technique. The name refers to the way the computer creates the final image — by analyzing the light sources in the scene and computing the paths of the rays produced by those lights. The result is a very realistic image, including reflections and caustics. Result of lighting and shadows that are close to what we observed in the real world. In, many different algorithms can factor into the computation of a pixel’s final shade, including the material’s absorption, reflection, transparency, translucency, and refraction characteristics.

What is better between them?

We would say Scanline is faster than raytracing. Scanline is the primary and Raytracing is the secondary. It will render elements of the scene that doesn’t require. While the raytracer will handle reflections/refractions, soft shadows, etc. For faster rendering with motion blur, we should set the Primary Renderer to “Rasterizer”. We will be in use of Raytracing it’s an under secondary effects. Some 3d artist like RayMAX combines both to give us the speed and the quality in one engine. We need to select which objects have to be traced. If the ray meets such an object, it is traced accordingly, but for all other objects, the normal way of calculation is used. Scanline works with polygons and Raytracing with mathematical objects. Scanline rendering has also other problems which usually don’t exist. These include different kinds of perspective correction textures, z-information, surface lighting, etc. Had all been perspective corrected in order to get a correct result, hidden surface removal, etc? We usually don’t need to worry about the perspective correct, due to the nature of the algorithm, we always get the right parameters.

We hope that our description might help you to know the differences.

Thank you.