Page 201 - DCAP504_Computer Graphics

Computer Graphics

The following figure 13.2 depicts a typical texture image of visual texture.

Figure 13.2: Visual Texture

Source: http://upload.wikimedia.org/wikipedia/en/6/67/Riley%2C_Cataract_3.jpg

Photography, drawing, and paintings use visual textures.

Now let us understand the different types of texture mapping. There are three types of texturing, they
are:
1. Texture Mapping: Texture mapping makes use of photographical or procedural generated
textures. These procedural generated patterns are made to appear very natural by subjecting them
to noise or random variation. The texture mapping method involves scanning or digitizing the
picture into another space, 2-D texture space. The sections of these spaces are mapped onto the
surfaces which are depicted by maintaining continuity. The 2-D co-ordinates use the exact object
depiction method to map onto the polygons or into the 2-D surfaces.
Realistic results are obtained by texture mapping the digitized photograph similar to wallpapering
of a cylinder. To view the pixel structures, the texture is enlarged for a clear depiction. These
pixels from the texture space are mapped on to the surfaces which are similar to sections of faces.
As there is no similarity between the pixels of texture spaces and pixels of image spaces, these
pixels tend to overlap each other.
To calculate the average of the pixels in the texture space and the average of the pixels occupied by
each of the pixel in image space is a tedious process. Texture mapping finds its application in
animation and virtual reality systems as it produces realistic images and scenes that have less
rendering time.

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