How does the rendering work


The term rendering is used in graphic image processing, in the creation of video sequences, in image synthesis and also in web browsers for HTML rendering that works with Cascading Style Sheets (CSS). In the context treated here, the aim is to generate a realistic graphic volume model, an animation or a video sequence from a computer model by means of rendering. It is a work step in the creation of a graphic object or a multimedia sequence.

If you use simple models such as wire models, preview formats or compressed data formats when creating complex graphic objects, animations or video sequences in the creation phase, in order to keep the computing time as short as possible, detailed calculations must be carried out when the object or animation is completed become. This includes not only realistic but also partially photo-realistic representations. The rendering takes into account, among other things, the surface structure and shadow formation, the material properties, color gradients, material transparency, light sources, the background, the sequence of movements, etc. These calculations are carried out by the computationally intensive rendering before final completion.

In image processing, there are various rendering methods such as Gouraud shading, ray tracing, radiosity or scanline, which differ in quality and application options, in their simplicity and complexity. Some offer advantages in the positioning of light sources and the formation of shadows, others in the calculation of the surface texture and surface smoothing. Depending on the process, the computing effort for rendering can take several hours.