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*[kynd](http://www.kynd.info) Nov 20, 2016*
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Shaders are often used to create realistic surfaces of natural or artificial material such as wood, marble, granite, metal, stone, etc. without using photographs or pre-rendered images. Here are demonstrations of some basic techniques. All the examples are based on anumber of random and noise functions from [Random](http://thebookofshaders.com/10/), [Noise](http://thebookofshaders.com/11/), [Cellular Noise](http://thebookofshaders.com/12/) and [Fractal Brownian Motion](http://thebookofshaders.com/13/) chapters. Once you get the basic ideas, try tweaking and adding more details to make them more realistic, coming up with new textures and optimizing the performance.
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Shaders are often used to create realistic surfaces of natural or artificial material such as wood, marble, granite, metal, stone, etc. without using photographs or pre-rendered images. Here are demonstrations of some basic techniques. All the examples are based on a number of random and noise functions from [Random](http://thebookofshaders.com/10/), [Noise](http://thebookofshaders.com/11/), [Cellular Noise](http://thebookofshaders.com/12/) and [Fractal Brownian Motion](http://thebookofshaders.com/13/) chapters. Once you get the basic ideas, try tweaking and adding more details to make them more realistic, coming up with new textures and optimizing the performance.
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Note that the terrain examples at the bottom use normal map and lighting which are techniques not yet introduced in this book. In short, what they do is to generate a map of the directions of the surface and shade the pixels accordingly. We will cover these ideas in future chapters. Stay tuned.
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