It will transform the three-dimensional light energy transfer process into a two-dimensional image process. Scenes and entities are represented in three-dimensional form, which is closer to the real world and easy to manipulate and transform, while graphic display devices are mostly two-dimensional raster displays and dot matrix printers.
From the performance of three-dimensional scene, the performance of N-dimensional grating and rasterization is image rendering, that is, rasterization. Grating display can be regarded as a pixel matrix, and any graphics displayed on raster display are actually a collection of pixels with one or more colors and gray levels.
Shading is a professional term of photography, which refers to a retouching technique to re-render clothes pictures or photos by adjusting parameters such as light, color and angle, so as to achieve the desired effect.
Extended data
Rendering image process
Before image rendering, it is necessary to prepare 3D geometric model information, 3D animation definition information and material information. Obtaining a three-dimensional geometric model through three-dimensional scanning, three-dimensional interactive geometric modeling and a three-dimensional model base; The definition of 3D animation is obtained through motion design, motion capture, motion calculation and dynamic deformation:
The material comes from scanned photos, computer-calculated images and drawings drawn by people. The tasks to be completed in image rendering are: geometric transformation, projection transformation, perspective transformation, window clipping, and then generating images through the obtained materials and light and shadow information. After the image rendering is completed, the image information will be output to the image file or video file, or the frame buffer of the display device to complete the generation of graphics.
Reference source? Baidu encyclopedia-image rendering