Documentation Center public:dson_spec:object_definitions:rigidity_group
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2026-04-20T16:18:41+00:00Documentation Center
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<h1 id="rigidity_group">rigidity_group</h1>
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<h2 id="description">Description</h2>
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<p>
Defines a vertex group and how it participates in a rigidity map.
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<h2 id="parent_objects">Parent Objects</h2>
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<li class="level1"><div class="li"> <a href="/public/dson_spec/object_definitions/rigidity/start" class="wikilink1" title="public:dson_spec:object_definitions:rigidity:start">rigidity</a></div>
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<h2 id="properties">Properties</h2>
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<th class="col0"> Name </th><th class="col1"> Description </th><th class="col2"> Default </th><th class="col3"> Required </th>
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<td class="col0"> id </td><td class="col1"> A string representing the Unique identifier within the file </td><td class="col2"> None </td><td class="col3"> yes </td>
</tr>
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<td class="col0"> rotation_mode </td><td class="col1"> A string representing the rotation mode for the group. Must be one of “none”, “full”, “primary”, or “secondary” </td><td class="col2"> “none” </td><td class="col3"> no </td>
</tr>
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<td class="col0"> scale_modes </td><td class="col1"> An array of the scale modes. Valid values for each axis are “none”, “primary”, “secondary”, or “tertiary”. </td><td class="col2"> None </td><td class="col3"> yes </td>
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<td class="col0"> reference_vertices </td><td class="col1"> An <a href="/public/dson_spec/format_description/data_types/start" class="wikilink1" title="public:dson_spec:format_description:data_types:start">int_array</a> of vertex indices for vertices in the reference geometry </td><td class="col2"> None </td><td class="col3"> no </td>
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<td class="col0"> mask_vertices </td><td class="col1"> An <a href="/public/dson_spec/format_description/data_types/start" class="wikilink1" title="public:dson_spec:format_description:data_types:start">int_array</a> of vertex indices from the rigidity mask </td><td class="col2"> None </td><td class="col3"> no </td>
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<td class="col0"> reference </td><td class="col1"> A string representing the <abbr title="Uniform Resource Identifier">URI</abbr> of the reference node </td><td class="col2"> None </td><td class="col3"> no </td>
</tr>
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<td class="col0"> transform_nodes </td><td class="col1"> An array of <abbr title="Uniform Resource Identifier">URI</abbr> to use when calculating the transform offset for the rigid geometry </td><td class="col2"> None </td><td class="col3"> no </td>
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<h2 id="details">Details</h2>
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<p>
The order of the values in <em>scale_modes</em> depends on the set up of the rigidity group. If there are <em>transform_nodes</em> they are in the rotation order of those nodes. If there is a <em>reference</em> node and no <em>transform_nodes</em> it uses the <em>reference</em> node’s axis order. Finally, if there is no <em>reference</em> node or scale nodes it is in the axis order of the calculated reference axis.
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<h2 id="example">Example</h2>
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<pre class="code">{
"id" : "SashRigid",
"rotation_mode" : "secondary",
"scale_modes" : [ "primary", "secondary", "none" ],
"reference_vertices" : {
"count" : 12,
"values" : [ 8198, 8200, 8201, 8230, 8234, 8235, 8236, 8237 ]
},
"mask_vertices" : {
"count" : 24,
"values" : [ 0, 1, 2, 6, 7, 8, 12, 13, 14, 15, 19, 20, 21 ]
},
"transform_nodes" : [ "#sash1", "#sash2" ]
}</pre>
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