assimp/code/StandardShapes.h

/*
Open Asset Import Library (ASSIMP)
----------------------------------------------------------------------

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*/

/** @file Declares a helper class, "StandardShapes" which generates
 *  vertices for standard shapes, such as cylnders, cones, spheres ..
 */
#ifndef AI_STANDARD_SHAPES_H_INC
#define AI_STANDARD_SHAPES_H_INC

#include <vector>


namespace Assimp	{

// ---------------------------------------------------------------------------
/** \brief Helper class to generate vertex buffers for standard geometric
 *  shapes, such as cylinders, cones, boxes, spheres, elipsoids ... .
 */
class StandardShapes
{
	// class cannot be instanced
	StandardShapes() {}

public:


	// ----------------------------------------------------------------
	/** Generates a mesh from an array of vertex positions.
	 *
	 *  @param positions List of vertex positions
	 *  @param numIndices Number of indices per primitive
	 *  @return Output mesh
	 */
	static aiMesh* MakeMesh(const std::vector<aiVector3D>& positions,
		unsigned int numIndices);


	static aiMesh* MakeMesh ( unsigned int (*GenerateFunc)
		(std::vector<aiVector3D>&));

	static aiMesh* MakeMesh ( unsigned int (*GenerateFunc)
		(std::vector<aiVector3D>&, bool));

	static aiMesh* MakeMesh ( unsigned int n,  void (*GenerateFunc)
		(unsigned int,std::vector<aiVector3D>&));

	// ----------------------------------------------------------------
	/** @brief Generates a hexahedron (cube)
	 *
	 *  Hexahedrons can be scaled on all axes.
	 *  @param positions Receives output triangles.
	 *  @param polygons If you pass true here quads will be returned
	 *  @return Number of vertices per face
	 */
	static unsigned int MakeHexahedron(
		std::vector<aiVector3D>& positions,
		bool polygons = false);

	// ----------------------------------------------------------------
	/** @brief Generates an icosahedron
	 *
	 *  @param positions Receives output triangles.
	 *  @return Number of vertices per face
	 */
	static unsigned int MakeIcosahedron(
		std::vector<aiVector3D>& positions);


	// ----------------------------------------------------------------
	/** @brief Generates a dodecahedron
	 *
	 *  @param positions Receives output triangles
	 *  @param polygons If you pass true here pentagons will be returned
	 *  @return Number of vertices per face
	 */
	static unsigned int MakeDodecahedron(
		std::vector<aiVector3D>& positions,
		bool polygons = false);


	// ----------------------------------------------------------------
	/** @brief Generates an octahedron
	 *
	 *  @param positions Receives output triangles.
	 *  @return Number of vertices per face
	 */
	static unsigned int MakeOctahedron(
		std::vector<aiVector3D>& positions);


	// ----------------------------------------------------------------
	/** @brief Generates a tetrahedron
	 *
	 *  @param positions Receives output triangles.
	 *  @return Number of vertices per face
	 */
	static unsigned int MakeTetrahedron(
		std::vector<aiVector3D>& positions);



	// ----------------------------------------------------------------
	/** @brief Generates a sphere
	 *
	 *  @param tess Number of subdivions - 0 generates a octahedron
	 *  @param positions Receives output triangles.
	 */
	static void MakeSphere(unsigned int tess,
		std::vector<aiVector3D>& positions);


	// ----------------------------------------------------------------
	/** @brief Generates a cone or a cylinder, either open or closed.
	 *
	 *  @code
	 *
	 *       |-----|       <- radius 1
	 *
	 *        __x__        <- ]               ^
	 *       /     \          | height        |
	 *      /       \         |               Y                 
	 *     /         \        |
	 *    /	          \       |
	 *   /______x______\   <- ] <- end cap
	 *
	 *   |-------------|   <- radius 2
	 *
	 *  @endcode
	 *
	 *  @param height Height of the cone
	 *  @param radius1 First radius
	 *  @param radius2 Second radius
	 *  @param tess Number of triangles.
	 *  @param bOpened true for an open cone/cylinder. An open shape has
	 *    no 'end caps'
	 *  @param positions Receives output triangles
	 */
	static void MakeCone(float height,float radius1,
		float radius2,unsigned int tess, 
		std::vector<aiVector3D>& positions,bool bOpen= false);


	// ----------------------------------------------------------------
	/** @brief Generates a flat circle
	 *
	 *  The circle is constructed in the planed formed by the x,z
	 *  axes of the cartesian coordinate system.
	 *  
	 *  @param radius Radius of the circle
	 *  @param tess Number of segments.
	 *  @param positions Receives output triangles.
	 */
	static void MakeCircle(float radius, unsigned int tess,
		std::vector<aiVector3D>& positions);
	
};
} // ! Assimp

#endif // !! AI_STANDARD_SHAPES_H_INC