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    Ok (sorry to be so dense here) so if W=0 then...

    Ok (sorry to be so dense here) so if W=0 then what is the direction for that vector if as it seems you have x,y,z,W. Do you just 'unpack' that information by breaking down the vector to components...
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    Thx for the reply. ..Is whether that vector is a...

    Thx for the reply. ..Is whether that vector is a position or direction by indicating this in the vector:

    [1,2,3,0] - 0->direction vector
    [1,2,3,1] - 1->position vector

    So I wouldn't use...
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    vector "type"?

    Broadly speaking I am trying to better understand the cartesian type of coordinate systems. In many tutorials "vectors" transformed by rotation and movement matrices just to name a few don't have...
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