Advanced RenderMan: Creating CGI for Motion Pictures - download pdf or read online

By Anthony A. Apodaca

ISBN-10: 1558606181

ISBN-13: 9781558606180

This is often pretty well the bible for an individual who makes use of renderman day-by-day. whether you're not a programmer this is a nice reference for these issues the programmers discuss :)

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Extra info for Advanced RenderMan: Creating CGI for Motion Pictures

Sample text

0 through period. 2 Geometry The geometric primitives that RenderMan handles are 2D surfaces. They are thin sheets, like pieces of paper, or perhaps more like sheets of rubber, that are deformed and transformed into the 3D coordinate system that we intrinsically think of as being our modeling space. RenderMan does not have any 1D drawing or annotation primitives, nor a 2D drawing surface on which to place them. Therefore, we will not spend too much time describing 1D or 4D surfaces, which, while interesting in themselves, have nothing to do with the task at hand.

Physics and Optics Many computer graphics algorithms, particularly shading algorithms, rely on the simulation of various aspects of the physics of materials and light to provide their realism. Sometimes the physical properties are duplicated exactly, sometimes they are approximated, sometimes ignored entirely and replaced by ad hoc rules. However, a little bit of physical intuition and a few simple equations will help you program RenderMan much more effectively. 1 Light Spectra As everyone remembers from elementary physics, visible light is a wave of electromagnetic energy within a certain range of wavelengths (roughly 380 nanometers to 750 nanometers, or 790 to 400 teraHertz).

6 Compositing and Alpha It is usually the case in image synthesis that the final image is made up of a combination of several images that each contain part of the data. For example, the image might be computed in layers, with the objects close to the camera rendered in one image and the images in the background rendered separately. In conventional special effects photography, optically combining the images is known as matting or composite photography and is done on a device called an optical printer.

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Advanced RenderMan: Creating CGI for Motion Pictures by Anthony A. Apodaca

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