Reference:Gradient Pattern - Revision history

Clipka: canonicalize some version numbers

2021-06-09T14:54:48Z

canonicalize some version numbers

Le Forgeron at 09:03, 1 March 2014

2014-03-01T09:03:53Z

Jholsenback: 1 revision: Reference Migration Initial Load

2012-03-15T19:06:18Z

1 revision: Reference Migration Initial Load

Jholsenback: 1 revision: Initial Load (TF)

2012-03-11T22:28:02Z

1 revision: Initial Load (TF)

New page

[[Category:Patterns]]
{{#indexentry:gradient, pattern}}
{{#indexentry:gradient, pattern}}
{{#indexentry:pattern, gradient}}
{{#indexentry:pattern, gradient}}
One of the simplest patterns is the <code>gradient</code> pattern. It is
specified as
<pre>
pigment {
gradient <Orientation>
[PIGMENT_MODIFIERS...]
}
</pre>

where <code><Orientation></code> is a vector pointing in
the direction that the colors blend. For example
<pre>
pigment { gradient x } // bands of color vary as you move
// along the "x" direction.
</pre>

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. In POV-Ray versions older than 3.5 the pattern reverses for negative values of x.
As per POV-Ray 3.5 this is not the case anymore. Using <code>gradient
y</code> or <code>gradient z</code> 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
<pre>
normal {
gradient <Orientation> [, Bump_Size]
[NORMAL_MODIFIERS...]
}
</pre>

where the vector <code><Orientation></code> is a required
parameter but the float <code>Bump_Size</code> which follows is
optional.
Note: The comma is required especially if Bump_Size is
negative.

If only the range -1 to 1 was used of the old gradient, for example in a
<code>sky_sphere</code>, it can be replaced by the <code>planar</code> or <code>marble</code>
pattern and revert the color_map. Also rotate the pattern for other orientations than <code>y</code>.
A more general solution is to use <code>function{abs(x)}</code> as a pattern instead
of <code>gradient x</code> and similar for <code>gradient y</code> and <code>gradient z</code>.

← Older revision		Revision as of 09:03, 1 March 2014
Line 49:		Line 49:
	A more general solution is to use <code>function{abs(x)}</code> as a pattern instead		A more general solution is to use <code>function{abs(x)}</code> as a pattern instead
	of <code>gradient x</code> and similar for <code>gradient y</code> and <code>gradient z</code>.</p>		of <code>gradient x</code> and similar for <code>gradient y</code> and <code>gradient z</code>.</p>
		+
		+	<table class="centered" width="420px" cellpadding="0" cellspacing="10">
		+	<tr>
		+	<td>[[Image:RefImgGradientPigment.png\|center\|200px<!--centered--->]]</td>
		+	<td>[[Image:RefImgGradientNormal.png\|center\|200px<!--centered--->]]</td>
		+	</tr>
		+	<tr>
		+	<td colspan="2"><p class="caption">gradient pattern used as pigment and normal respectively</p></td>
		+	</tr>
		+	</table>

@@ Line 24: / Line 24: @@
 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. In POV-Ray versions older than 3.5 the pattern reverses for negative values of x.
+x=2. In POV-Ray versions older than v3.5 the pattern reverses for negative values of x.
-As per POV-Ray 3.5 this is not the case anymore. Using <code>gradient
+As per POV-Ray v3.5 this is not the case anymore. Using <code>gradient
 y</code> or <code>gradient z</code> makes the colors blend along the y- or
 z-axis. Any vector may be used but x, y and z are most common.</p>

← Older revision	Revision as of 19:06, 15 March 2012
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