CraftML provides a rich vocabulary of tags and transformation / layout commands that can meet most of the 3D modeling needs. But there are special situations when this vocabulary is insufficient. For instance, we may want to layout elements in a wave pattern or enlarge any element that is smaller than 20mm in x. In such situations, we can use a script tag to contain custom code to achieve what we want.
Inside each script, three special variables are exposed to let us modify various aspects of the model we are designing:
$a query object providing a jQuery-like API for searching and manipulating the this element and its descendants.
thisa reference to the element that contains this script tag.
<param name="foo" type="number" value="5"/> <param name="bar" type="string" value="hello"/> <script> $params.foo // => 5 $params.bar // => 'hello' this </script>
<cube/> <script> // select cube and scale it by 2 $('cube').t('scale 2') </script> <!-- is equivalent to --> <cube t="scale 2"/>
<g> <cube/> <cube/> <script> this.children.length // => 2 </script> <cube/> <cube/> <script> this.children.length // => 4 </script> </g>