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Noise


This is a pop up menu found in the shaders that generate patterns based on random algorithms. It adds noise at three different levels. Simple noise generates fast results, but may reveal an underlying rectangular grid along which the random pattern is aligned. The Better option still uses the rectangular grid, but it will not be as visible in the random pattern as with the Simple option. The Best option does not use a grid at all, but takes the longest to compute. The quality of the random pattern when using Best can be further improved by selecting a higher value for the # Of Impulses, which is an option next to the Noise menu. Reasonable values lie in the range of 3 - 10, with higher values causing additional decrease in rendering speed. Figure 2.1.3 shows examples of noise at all three levels generated for the Mist shader.