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Non-photorealistic illumination models don't attempt to model the perceived brightness of a surface in a realistic way, but focuses expressing certain styles. They are used for example in cartoons, video games, movies or technical illustrations, and include: Cel shading; Gooch shading
The third image has shading enabled, which makes the image more realistic and makes it easier to see which face is which. Rendered image of a box. This image has no shading on its faces, but instead uses edge lines (also known as wireframe ) to separate the faces and a bolder outline to separate the object from the background.
Cartoon rendering, also called cel shading or toon shading, is a non-photorealistic rendering technique used to give 3D computer graphics a flat, cartoon-like appearance. Its defining feature is the use of distinct shading colors rather than smooth gradients, producing a look reminiscent of comic books or animated films.
It is often referred to as "Physically Based Lighting" or "Physically Based Shading". Many PBR pipelines aim to achieve photorealism. Feasible and quick approximations of the bidirectional reflectance distribution function and rendering equation are of mathematical importance in this field.
An example of two kinds of shadings: Flat shading on the left and Phong shading on the right. Phong shading is an improvement on Gouraud shading, and was one of the first computer shading models developed after the basic flat shader, greatly enhancing the appearance of curved surfaces in renders.
Cel shading or toon shading is a type of non-photorealistic rendering designed to make 3D computer graphics appear to be flat by using less shading color instead of a shade gradient or tints and shades. A cel shader is often used to mimic the style of a comic book or cartoon and/or give the render a characteristic paper-like texture. [1]
Bloom is a shader effect in computer graphics that creates a glow around bright objects in a scene.
Flat shading is a simple shading model with a uniform application of lighting and color per polygon. [32] The color and normal of one vertex is used to calculate the shading of the entire polygon. [18] Flat shading is inexpensive, as lighting for each polygon only needs to be calculated once per render. [32]