VecUtils.h

#ifndef VEC_UTILS_H
#define VEC_UTILS_H

#include <vecmath.h>

class VecUtils
{
public:

    static Vector3f min( const Vector3f& b, const Vector3f& c )
    {
        Vector3f out;

        for( int i = 0; i < 3; ++i )
        {
            out[ i ] = ( b[i] < c[i] ) ? b[i] : c[i];
        }

        return out;
    }

    static Vector3f max( const Vector3f& b, const Vector3f& c )
    {
        Vector3f out;

        for( int i = 0; i < 3; ++i )
        {
            out[ i ] = ( b[i] > c[i] ) ? b[i] : c[i];
        }

        return out;
    }

    static Vector3f clamp( const Vector3f& data, float low = 0, float high = 1 )
    {
        Vector3f out = data;
        for( int i = 0; i < 3; ++i )
        {
            if( out[ i ] < low )
            {
                out[ i ] = low;
            }
            if( out[ i ] > high )
            {
                out[ i ] = high;
            }
        }

        return out;
    }

    // transforms a 3D point using a matrix, returning a 3D point
    static Vector3f transformPoint( const Matrix4f& mat, const Vector3f& point )
    {
        return ( mat * Vector4f( point, 1 ) ).xyz();
    }

    // transform a 3D directino using a matrix, returning a direction
    // This function *does not* take the inverse tranpose for you.
    static Vector3f transformDirection( const Matrix4f& mat, const Vector3f& dir )
    {
        return ( mat * Vector4f( dir, 0 ) ).xyz();
    }
};

#endif // VEC_UTILS_H