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--- 3d-guide:3d-manipulations [2024/04/29 17:35] – [The OpenGL-based 3D User Interface] gaetan
+++ 3d-guide:3d-manipulations [2024/12/11 11:33] (current) – [Turtle Commands] gaetan
@@ Line 16: / Line 16: @@
 As GroIMP's primary purpose is the modelling of three-dimensional virtual plants, GroIMP's 3D facilities play a prominent role. They are made available by the 3D plugin and contain the following features:
-  * 3D geometry objects: Spheres, cones and other primitives, curves and various kinds of NURBS surfaces, heightfields. (see [[:groimp-platform:objects:all|the list of all objects]]).
+  * 3D geometry objects: Spheres, cones and other primitives, curves and various kinds of NURBS surfaces, heightfields. (see [[:user-manual:objects|the list of all objects]]).
   * Materials can be assigned to objects to produce a variety of shading effects in visualization. Materials are defined using a _shading network_: This establishes a data flow through the nodes of the network which finally leads to the visible material properties like colour and opacity. Several kinds of nodes are available: Image maps, procedural maps, transformations. You can freely mix them in the shading network, which gives you great flexibility in defining materials.
@@ Line 59: / Line 59: @@
 ====== Turtle Commands ======
-The list of turtle commands can be found [[:groimp-platform:turtle_commands|here]].
+In GroIMP 3d movement in the scene are managed by turtle commands.
+In turtle geometry a sequence of commands can be used to describe a structure. These commands are processed by a "turtle" and change either the state or the position of the turtle. By doing so the turtle can add cylinders (with the additions of RGG also other objects) to the scene.
+See more:
+  * [[:groimp-platform:turtle_commands|List of all turtle commands]]
+  * [[https://en.wikipedia.org/wiki/Turtle_graphics|What is turtle graphics]]
+Tutorials:
+  * [[tutorials:xl-turtle-geometry|How to use turtle commands]]