Difference between revisions of "Reference Talk:Potential Pattern"
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| + | <p>{{New}} in version 3.7.1 a <code>potential</code> pattern has been added to define a pattern based on the <em>potential</em> field of a <code>blob</code> or <code>isosurface</code> object.</p> | ||
| + | <p>Using <code>pigment</code> in the following example, the syntax for the new pattern is as follows:</p> | ||
| − | + | <pre> | |
| − | + | pigment { | |
| − | + | potential { BLOB | ISOSURFACE } | |
| + | [threshold BOOL] | ||
| + | [PIGMENT_MODIFIERS...] | ||
| + | } | ||
| + | </pre> | ||
| − | + | <p>With <code>threshold on</code> the pattern will take the <code>blob</code> or <code>isosurface</code> object's <em>potential minus the threshold</em>; otherwise it will take the <em>raw potential</em> which is the default behavior.</p> | |
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| − | + | <p>The <em>isosurface's</em> container has no effect on the <code>potential</code> pattern.</p> | |
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| − | + | <p>The pattern value is <em>not</em> bound to the [0..1] range, unless you explicitly specify a <code>wave_type</code>.</p> | |
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| + | <p>Applying the <code>inverse</code> keyword to the object will cause the pattern to be reversed as well; so, when using <code>threshold on</code> for blobs, positive pattern values always indicate inside, while negative values indicate outside.</p> | ||
| − | + | <p class="Note"><strong>Note:</strong> By default this is the opposite for isosurfaces, so for easier use, the new pattern is therefore accompanied by an extension to the <code>isosurface</code> syntax as shown below:</p> | |
| − | + | ||
| − | + | <pre> | |
| + | isosurface { | ||
| + | ... | ||
| + | polarity FLOAT | ||
| + | ... | ||
| + | } | ||
| + | </pre> | ||
| + | |||
| + | <p>Setting <code>polarity</code> to a positive value causes above-threshold values to be interpreted as inside, and below-threshold values as outside, rather than the other way round</p> | ||
| + | |||
| + | <p>See also: [[Reference:Blob|Blob]] and [[Reference:Isosurface|Isosurface]]</p> | ||
Latest revision as of 11:20, 20 December 2016
New in version 3.7.1 a potential pattern has been added to define a pattern based on the potential field of a blob or isosurface object.
Using pigment in the following example, the syntax for the new pattern is as follows:
pigment {
potential { BLOB | ISOSURFACE }
[threshold BOOL]
[PIGMENT_MODIFIERS...]
}
With threshold on the pattern will take the blob or isosurface object's potential minus the threshold; otherwise it will take the raw potential which is the default behavior.
The isosurface's container has no effect on the potential pattern.
The pattern value is not bound to the [0..1] range, unless you explicitly specify a wave_type.
Applying the inverse keyword to the object will cause the pattern to be reversed as well; so, when using threshold on for blobs, positive pattern values always indicate inside, while negative values indicate outside.
Note: By default this is the opposite for isosurfaces, so for easier use, the new pattern is therefore accompanied by an extension to the isosurface syntax as shown below:
isosurface {
...
polarity FLOAT
...
}
Setting polarity to a positive value causes above-threshold values to be interpreted as inside, and below-threshold values as outside, rather than the other way round
See also: Blob and Isosurface