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==   Geometry generation and parametrization == 

===  Geometry generation and parametrization tools ===
The following open-source CAD and solid modeling tools can be used for geometry generation and parametrization:

* [http://www.salome-platform.org/    Salome:] is a history based CAD tool (parametric design). It has quite extensive capabilities for creation and manipulation of solid geometries.

* [http://www.blender.org/ Blender:] is a direct 3D modeling tool. Extremely powerful for surface modeling and manipulation. 

* [http://www.pythonocc.org/  pythonOCC:] is a 3D CAD/CAE/PLM development framework for the Python programming language. It provides features such as advanced topological and geometrical operations, data exchange (STEP, IGES, STL import/export), 2D and 3D meshing, rigid body simulation, parametric modeling.  	 

* [http://www.openscad.org/ Openscad:] is a 3D programming modeling tool. It reads in a script file that describes the object and renders the 3D model from this script file. 										 

* [http://www.openvsp.org/ OpenVSP:] is a parametric aircraft geometry tool. It allows users to create a 3D model of an aircraft defined by common engineering parameters.

===  OpenSCAD tutorials ===