Obscured Backface Style/Colour

These behave in the same way as the Obscured Style/Colour but apply only when drawing backface lines that are also obscured. This allows obscured backface lines to be drawn in a different style/colour from other obscured lines, or switched off entirely. If these attributes are not set explicitly, they will match the Obscured style/colour. Once they are set explicitly on a style element, they will have their own values and will need to be maintained independently on that style element. Note that it is only possible to switch the Obscured Backface style on, if both the general Obscured Backface styles are also on.

• Attributes BOSTYLE, BOCOLOUR