Difference between revisions of "Scripting Node"
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This node can be added to any other node, for example a Volume Node (i.e. to produce a volume rendering of the data). | This node can be added to any other node, for example a Volume Node (i.e. to produce a volume rendering of the data). | ||
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| + | == Examples using a vector field == | ||
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| + | In the following examples we will use a vector field from a large scale combustion dataset. | ||
| + | You can open this dataset with your [[ViSUS Viewer]] using "Open URL" and this address: http://atlantis.sci.utah.edu/mod_visus?dataset=lifted_time | ||
A Volume Node for a vector field will visualize a volume rendering as following: | A Volume Node for a vector field will visualize a volume rendering as following: | ||
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[[File:flame_mag2.png|350px]] | [[File:flame_mag2.png|350px]] | ||
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| + | Another example using a vector field is to compute a 2D '''Linear Integral Convolution''' (LIC), this can be done using the following simple script: | ||
| + | output=Visus.Array.lic(input,0,1); | ||
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| + | where the second and third parameters of the ''lic'' function are the vector's components that we want to use for the computation. | ||
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| + | The result will be like this (using a "Banded" palette): | ||
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| + | [[File:lic_banded.png|350px]] | ||
Revision as of 20:14, 2 August 2017
The scripting node allows to perform operations on the data using a javascript-like syntax.
This node can be added to any other node, for example a Volume Node (i.e. to produce a volume rendering of the data).
Examples using a vector field
In the following examples we will use a vector field from a large scale combustion dataset. You can open this dataset with your ViSUS Viewer using "Open URL" and this address: http://atlantis.sci.utah.edu/mod_visus?dataset=lifted_time
A Volume Node for a vector field will visualize a volume rendering as following:
Since the data has 3 components the default visualization uses the 3 components as RGB channels.
If we want to evaluate and visualize the squared magnitude of this (three-dimensional) vector field the user can simply insert a scripting node with the following script:
output= ((1.0*input[0])*input[0]) + ((1.0*input[1])*input[1]) + ((1.0*input[2])*input[2]);
Where the input field represent the input data that enter the scripting node, the output represents the result of the computation.
The output will be a scalar field that will be rendered as following:
Another example using a vector field is to compute a 2D Linear Integral Convolution (LIC), this can be done using the following simple script:
output=Visus.Array.lic(input,0,1);
where the second and third parameters of the lic function are the vector's components that we want to use for the computation.
The result will be like this (using a "Banded" palette):
