Question

What is the significance of hidden surface removal?

Answer 1

In 3D computer graphics, shown surface determination (also known as hidden surface removal (HSR), occlusion culling (OC) orvisible surface determination (VSD)) is the process used to determine which surfaces and parts of surfaces are not visible from a certain viewpoint. A hidden surface determination algorithm is a solution to thevisibility problem, which was one of the first major problems in the field of 3D computer graphics. The process of hidden surface determination is sometimes called hiding, and such an algorithm is sometimes called ahider. The analogue for line rendering ishidden line removal. Hidden surface determination is necessary to render an image correctly, so that one may not view features hidden behind the model itself, allowing only the naturally viewable portion of the graphic to be visible.

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Answer 2

We have looked at removing backfaces, this stage will usually eliminate about half of the surfaces in a scene from further processing. Once the polygons to be displayed have been clipped, we need to draw them on to the display device (Rasterization).



We also need to remove parts of those surfaces that are partially obscured by other surfaces. These are called hidden surfaces. If hidden surfaces are not dealt with correctly, then we may get distorted images like the right of the image below. Rasterization and HSR are usually combined in to a single phase of the rendering pipeline.