Page 117 - DCAP504_Computer Graphics

Computer Graphics

The figure 8.3 shows mesh outline example.

Figure 8.3 : Mesh Outline Example

Source: http://www.siggraph.org/education/materials/HyperGraph/modeling/polymesh/polymesh.htm

Some of the common polygon meshes are triangle strip and quadrilateral mesh
as shown in figure 8.4. The renderers that implement hardware have the
capacity to produce up to 1,000,000 or even more shaded triangles per second.
They also include application of lighting effects and surface texture.

Figure 8.4 : Triangle and Quadrilateral Examples

Triangle strip Quadrilateral mesh

Source: http://en.wikipedia.org/wiki/File:Spoon_fi.jpg
Polygon Tables
The polygon surfaces are usually specified with a set of vertex coordinates and associated attribute
parameters which are listed below:
1. Geometric Data Table: It includes vertices, edges, and polygon surfaces.

2. Attribute Table: It includes degree of transparency and surface reflectivity, etc.
The best way to organize the storage of geometric data is to create three lists:
1 A Vertex Table: Here the values of each coordinate of the vertex are stored.
2. An Edge Table: It includes the pointers to indicate each of the vertices edge into the vertex table.
3. A Polygon Table: It contains pointers to the edge table to indicate edges for the polygons.

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