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--- 01_user_documentation:03_interacting_with_groimp:10_import:04_reference [2025/09/05 17:20] – removed - external edit (Unknown date) 127.0.0.1
+++ 01_user_documentation:03_interacting_with_groimp:10_import:04_reference [2025/09/05 17:20] (current) – ↷ Page moved from 01_user_documentation:03_interacting_with_groimp:06_import:04_reference to 01_user_documentation:03_interacting_with_groimp:10_import:04_reference gaetan
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+===== Referencing External 3D Models =====
+GroIMP allows the reuse of external 3D models (e.g., ``.dtd`` files created in the RGG editor) by referencing them directly in XL code. This is done using the ``Reference(...)`` constructor.
+==== Basic Usage ====
+To instantiate a 3D object into the scene:
+  Reference("cherry_new.dtd");
+This creates a single node representing the geometry of the external object but does not import its internal graph structure.
+==== Example: Multiple Instances ====
+This example creates three identical tree models placed along the y-axis:
+  protected void init()
+  [
+    Axiom ==> for(int i=0; i<3; i++)(
+      Translate(0, 1, 0)
+      [
+        Reference("cherry_new.dtd");
+      ]
+    );
+  ]