void Transformation::product(const Transformation& a,const Transformation& b)
{
if (a.isIdentity())
{
*this = b;
return;
}
if (b.isIdentity())
{
*this = a;
return;
}
if (a.isUniformScales())
{
_rot = a.getRotate()*b.getRotate();
_trans = ((a.getRotate() * b.getTranslate())
+ a.getTranslate()) * a.getUniformScale();
if ( b.isUniformScales())
setUniformScale(a.getUniformScale()*b.getUniformScale());
else
setScale(b.getScale()*a.getUniformScale());
return;
}
// In all remaining cases, the matrix cannot be written as R*S*X+T.
Matrix3 mA;
Vector3 aS = a.getScale();
mA[0][0] = mA[0][0] * aS.x;
mA[1][1] = mA[1][1] * aS.y;
mA[2][2] = mA[2][2] * aS.z;
Matrix3 mB;
Vector3 bS = b.getScale();
mB[0][0] = mB[0][0] * bS.x;
mB[1][1] = mB[1][1] * bS.y;
mB[2][2] = mB[2][2] * bS.z;
setRotate(mA*mB);
setTranslate(mA*b.getTranslate()+a.getTranslate());
}
void Stream::write( const Transformation &t )
{
write( t.getTranslate() );
write( t.getRotate() );
write( t.getScale() );
}
