Set OS 99 = 0 for skew box depiction with normal dimensioning style. This is the default setting.
Set OS 99 = 1 for skew triangle depiction with normal dimensioning style.
Set OS 99 = 3 for skew triangle depiction with alternative dimensioning style.
3D skew sections normally follow the value in Position 1 that are set for 2D skews, unless the value is set in Pos 2.
In the following 3D skew example, OS 99 Pos 2 = blank, that is, it is not set. Consequently, the skew type follows what is set in Position 1, in this case, value 3, which gives triangle depiction with alternative dimensioning style.
Changing the setting so that OS 99 Pos 2 = 1, results in the 3D skews shown in the box style.