Main Features of osgModeling 0.1.1

- Support for 4 kinds of curves:
* k-degree Bezier curves.
* k-degree NURBS curves.
* Helix (3-dimensional spiral curves resembling a spring).
* And user customized curves.

- Support for 6 kinds of surfaces:
* m,n-degree Bezier surfaces.
* m,n-degree NURBS surfaces.
* Extrusions (constructed by a profile extruded along a path).
* Revolutions (constructed by a profile rotated specified angles).
* Lofts (constructed by lofting a series of curves that define the cross section on a specified path).
* And user customized models.

- Generate normal arrays and texture coordinate arrays for various models (except user customizations).
* Support generating normals with different weights.
* Support the normal-flip operation.

- Free to define customized algorithms to created vertices arrays, normal arrays and texture coordinate arrays for own models.

- Construct the polygon mesh structures (Vertices-Edges-Faces) for geometries.

- Subdivide polygon meshes into higher level using different methods.
* Loop method: Split each face into 4 parts at every level to build subdivisions.
* Sqrt(3) method: Split each face into 3 parts at every level to build subdivisions.

- Construct the binary space partitioning (BSP) trees for models in built or converted from osg::Geometry.

- Geometric boolean operations (Intersection, Union and Difference) based on BSP trees of models.