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--- 01_user_documentation:06_graph:04_visitor:02_instantiation [2025/01/30 11:52] – ↷ Links adapted because of a move operation gaetan
+++ 01_user_documentation:06_graph:04_visitor:02_instantiation [2025/09/05 14:54] (current) – gaetan
@@ Line 2: / Line 2: @@
 ====== Instantiation ======
-This section present what is an graph instantiation.
+Instantiations are additional transient "sub-graphs" that can be resolved by a visitor. The most common example of instantiation is the additional 3D shapes added to a Node when it is represented in the 3D scene. The objects created in the instantiation are linked to the Node who have declare that instantiation.
+(For instance, the [[:01_user_documentation:08_light|raytracing]] consider all shapes from a Node instantiation to be the Node - thus the node get absorbed light include the shapes).
-====== ======
+Instantiations are not connected to the [[:01_user_documentation:06_graph|data graph]]. Thus, they are not included in queries.
+======  ======
+Visitors are testing Node for instantiation by checking if they can provide an [[https://javadoc.grogra.de/graph/de/grogra/graph/Instantiator.html|instantiator]]. The method used is:
+<code java>
+public de.grogra.graph.Instantiator getInstantiator(){
+   // return the instantiator.
+}
+</code>
+The only requirement for the instantiator object is to implements the interface Instantiator and the method:  ''boolean instantiate (ArrayPath path, Visitor v);''.
-{{namespace>01_user_documentation:06_graph:04_visitor:02_instantiation}}