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Since you can't see the hidden surface, from your point of view, then the graphics system should not (normally) display the hidden surface except (optionally) to display dashed lines for hidden edges and dashed dimension lines to hidden edges.
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What is hidden surface and hidden removal in computer graphics?
Hidden Surfaces :- In 3D Computer graphics, it is the process in which we decide which surface or part of surface are not visible from a certain viewpoint. It's solution is a hidden surface algorithm that is visibility problem. It was the first major problem in the field of 3D computer graphics. This process of hidden surface is called hiding and algorithm which is used called a hider.Firstly an image is scanned correctly, which part of the image is not visible that should not be drawn. It also speeds up rendering since objects that are not visible can be removed from the graphics pipeline.Through many techniques we can determination hidden surface. There are different stages of hidden surfaces determination.These stages include:-1. Back face Culling2. Viewing Frustum Culling3. Occlusion Culling4. Contribution Culling.1. Back face Culling:- In back face culling, these object which are not solid in image, the back side of some Faces or polygons, in the mesh will never face the camera. So, no need to draw those faces. It is the responsibility of effect. If the camera happens to be inside a mesh, rather than seeing the inside surface of mesh it disappear completely.2. Viewing frustum culling:- In this technique, a viewing frustum is a geometric representation of the volume of the virtual camera. So, those objects which are outside from the volume are not visible in the final image. So, they are discarded object those are lie on the boundary of viewing frustum. Those objects are cut into pieces along this boundary in the process called clipping.3. Occlusion culling: - Occlusion culling is that where the objects are hidden by the other objects those are front of the computer so it is the fundamental problem of the computer. Here we use painter's Algorithm with this polygons are stored then draw back to front.4. Contribution Culling: - In contribution culling we check objects those are far away from the view point, so these are not shown then through where we determine that which portion of image is shadow.For more on images and website creation, you can visit our flash website builder which can help you with free HTML, Flash templates and Flash intros.
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