assimp/code/Geometry/GeometryUtils.h

/*
Open Asset Import Library (assimp)
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*/

#include <assimp/types.h>
#include <assimp/mesh.h>

namespace Assimp {

// ---------------------------------------------------------------------------
/// @brief This helper class supports some basic geometry algorithms.
// ---------------------------------------------------------------------------
class ASSIMP_API GeometryUtils {
public:
    /// @brief Will calculate the area of a triangle.
    /// @param a  The first vertex of the triangle.
    /// @param b  The first vertex of the triangle.
    /// @param c  The first vertex of the triangle.
    static ai_real heron( ai_real a, ai_real b, ai_real c );
    
    /// @brief Will compute the distance between 2 3D-vectors
    /// @param vA  Vector a.
    /// @param vB  Vector b.
    /// @return The distance.
    static ai_real distance3D( const aiVector3D &vA, const aiVector3D &vB );

    /// @brief Will calculate the area of a triangle described by a aiFace.
    /// @param face   The face
    /// @param mesh   The mesh containing the face
    /// @return The area.
    static ai_real calculateAreaOfTriangle( const aiFace& face, aiMesh* mesh );

    /// @brief Will calculate the intersection between a ray and a plane
    /// @param ray          The ray to test for
    /// @param planePos     A point on the plane
    /// @param planeNormal  The plane normal to describe its orientation
    /// @param pos          The position of the intersection.
    /// @return true is an intersection was detected, false if not.
    static bool PlaneIntersect(const aiRay& ray, const aiVector3D& planePos, const aiVector3D& planeNormal, aiVector3D& pos);

    /// @brief Will normalize an array of vectors.
    /// @param vectorArrayIn    The incoming arra of vectors.
    /// @param vectorArrayOut   The normalized vectors.
    /// @param numVectors       The array size.
    static void normalizeVectorArray(aiVector3D *vectorArrayIn, aiVector3D *vectorArrayOut, size_t numVectors);
};

} // namespace Assimp