Reference:Bozo Pattern - Revision history

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[[Category:Patterns]]
{{#indexentry:bozo, keyword}}
{{#indexentry:bozo, pattern}}
{{#indexentry:keyword, bozo}}
{{#indexentry:pattern, bozo}}
The <code>bozo</code> pattern is a very smooth, random noise function that
is traditionally used with some turbulence to create clouds. The <code>
spotted</code> pattern is identical to <code>bozo</code> but in early
versions of POV-Ray spotted did not allow turbulence to be added. Turbulence
can now be added to any pattern so these are redundant but both are retained
for backwards compatibility. The <code>bumps</code> pattern is also identical
to <code>bozo</code> when used anywhere except in a <code>normal</code>
statement. When used as a normal pattern, <code>bumps</code> uses a slightly
different method to perturb the normal with a similar noise function.

The <code>bozo</code> noise function has the following properties:

 1. It is defined over 3D space i.e., it takes x, y, and z and returns
the noise value there.

2. If two points are far apart, the noise values at those points are
relatively random.

3. If two points are close together, the noise values at those points are
close to each other.

You can visualize this as having a large room and a thermometer that
ranges from 0.0 to 1.0. Each point in the room has a temperature. Points that
are far apart have relatively random temperatures. Points that are close
together have close temperatures. The temperature changes smoothly but
randomly as we move through the room.

Now let's place an object into this room along with an artist. The
artist measures the temperature at each point on the object and paints that
point a different color depending on the temperature. What do we get? A
POV-Ray bozo texture!

The <code>bozo</code> pattern has a default color_map built in that results
in a green, blue, red and white pattern with sharp transitions.

Note: The appearance of the bozo pattern depends on the noise generator used.
The default type is 2. This may be changed using the <code>noise_generator</code> keyword. See the section Pattern Modifiers: [[Reference:Pattern#Noise Generators|:noise_generator|noise_generator]].

← Older revision		Revision as of 08:24, 1 March 2014
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	<p class="Note"><strong>Note:</strong> The appearance of the bozo pattern depends on the noise generator used.		<p class="Note"><strong>Note:</strong> The appearance of the bozo pattern depends on the noise generator used.
	The default type is 2. This may be changed using the <code>noise_generator</code> keyword. See the section Pattern Modifiers: [[Reference:Pattern Modifiers#Noise Generators\|:noise_generator\|noise_generator]].</p>		The default type is 2. This may be changed using the <code>noise_generator</code> keyword. See the section Pattern Modifiers: [[Reference:Pattern Modifiers#Noise Generators\|:noise_generator\|noise_generator]].</p>
		+
		+	<table class="centered" width="420px" cellpadding="0" cellspacing="10">
		+	<tr>
		+	<td>[[Image:RefImgBozoPigment.png\|center\|200px<!--centered--->]]</td>
		+	<td>[[Image:RefImgBozoNormal.png\|center\|200px<!--centered--->]]</td>
		+	</tr>
		+	<tr>
		+	<td colspan="2"><p class="caption">bozo pattern used as pigment and normal respectively</p></td>
		+	</tr>
		+	</table>

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	<p class="Note"><strong>Note:</strong> The appearance of the bozo pattern depends on the noise generator used.		<p class="Note"><strong>Note:</strong> The appearance of the bozo pattern depends on the noise generator used.
−	The default type is 2. This may be changed using the <code>noise_generator</code> keyword. See the section Pattern Modifiers: [[Reference:Pattern#Noise Generators\|:noise_generator\|noise_generator]].</p>	+	The default type is 2. This may be changed using the <code>noise_generator</code> keyword. See the section Pattern Modifiers: [[Reference:Pattern Modifiers#Noise Generators\|:noise_generator\|noise_generator]].</p>

← Older revision	Revision as of 19:27, 23 July 2012
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