Triangle3d.h

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// Triangle3d.h:
// -------------
//

#ifndef __IPSDKMATH_TRIANGLE3D_H__
#define __IPSDKMATH_TRIANGLE3D_H__

#include <IPSDKMath/IPSDKMathExports.h>
#include <IPSDKMath/Geometry/3d/Point3d.h>

namespace ipsdk {
namespace math {


IPSDK_FORCEINLINE ipReal64
trianglePerimeter(const ipReal64 x0, const ipReal64 y0, const ipReal64 z0,
                  const ipReal64 x1, const ipReal64 y1, const ipReal64 z1,
                  const ipReal64 x2, const ipReal64 y2, const ipReal64 z2)
{
    return distance(x0, y0, z0, x1, y1, z1) +
           distance(x0, y0, z0, x2, y2, z2) +
           distance(x1, y1, z1, x2, y2, z2);
}

IPSDK_FORCEINLINE ipReal64
triangleArea(const ipReal64 x0, const ipReal64 y0, const ipReal64 z0,
             const ipReal64 x1, const ipReal64 y1, const ipReal64 z1,
             const ipReal64 x2, const ipReal64 y2, const ipReal64 z2)
{
    ipReal64 crossProdX, crossProdY, crossProdZ;
    crossProduct(x0-x1, y0-y1, z0-z1, x0-x2, y0-y2, z0-z2,
                 crossProdX, crossProdY, crossProdZ);

    return 0.5 * normL2(crossProdX, crossProdY, crossProdZ);
}

IPSDK_FORCEINLINE void
triangleNormal(const ipReal64 x0, const ipReal64 y0, const ipReal64 z0,
               const ipReal64 x1, const ipReal64 y1, const ipReal64 z1,
               const ipReal64 x2, const ipReal64 y2, const ipReal64 z2,
               ipReal64& nx, ipReal64& ny, ipReal64& nz)
{
    crossProduct(x1-x0, y1-y0, z1-z0,
                 x2-x0, y2-y0, z2-z0,
                 nx, ny, nz);
}

IPSDK_FORCEINLINE bool
triangleUnitNormal(const ipReal64 x0, const ipReal64 y0, const ipReal64 z0,
                   const ipReal64 x1, const ipReal64 y1, const ipReal64 z1,
                   const ipReal64 x2, const ipReal64 y2, const ipReal64 z2,
                   ipReal64& nx, ipReal64& ny, ipReal64& nz)
{
    triangleNormal(x0, y0, z0, x1, y1, z1, x2, y2, z2, nx, ny, nz);
    const ipReal64 norm = normL2(nx, ny, nz);
    if (norm != 0) {

        nx /= norm;
        ny /= norm;
        nz /= norm;

        return true;
    }
    else
        return false;
}


} // end of namespace math
} // end of namespace ipsdk

#endif // __IPSDKMATH_TRIANGLE3D_H__