void Quat4d::setAxisAngle( double radians, const Vector3d& axis )
{
m_elements[ 0 ] = cos( radians / 2 );
double sinHalfTheta = sin( radians / 2 );
double vectorNorm = axis.abs();
double reciprocalVectorNorm = 1.0 / vectorNorm;
m_elements[ 1 ] = axis.x * sinHalfTheta * reciprocalVectorNorm;
m_elements[ 2 ] = axis.y * sinHalfTheta * reciprocalVectorNorm;
m_elements[ 3 ] = axis.z * sinHalfTheta * reciprocalVectorNorm;
}
NIBBLETYPE GetLogMetaFromDirection(NIBBLETYPE a_BlockMeta, Vector3d a_Direction)
{
a_Direction.abs();
if ((a_Direction.y > a_Direction.x) && (a_Direction.y > a_Direction.z))
{
return a_BlockMeta;
}
else if (a_Direction.x > a_Direction.z)
{
return a_BlockMeta + 4;
}
else
{
return a_BlockMeta + 8;
}
}