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One of the simplest patterns is the gradient pattern. It is specified as
- pigment {gradient
}
where <Orientation> is a vector pointing in the direction that the colors blend. For example
pigment { gradient x } // bands of color vary as you move
// along the "x" direction.
produces a series of smooth bands of color that look like layers of colors next to each other. Points at x=0 are the first color in the color map. As the x location increases it smoothly turns to the last color at x=1. Then it starts over with the first again and gradually turns into the last color at x=2. The pattern reverses for negative values of x. Using gradient y or gradient z makes the colors blend along the y- or z-axis. Any vector may be used but x, y and z are most common.
As a normal pattern, gradient generates a saw-tooth or ramped wave appearance. The syntax is
- normal {gradient
, Bump_Size] [NORMAL_MODIFIERS...] }
where the vector <Orientation> is a required parameter but the float Bump_Size which follows is optional. Note that the comma is required especially if Bump_Size is negative.
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