Rendering roof parts without volumes about streets-gl HOT 1 OPEN

There are example of situations where the wall face should be rendered, so any change should take this into consideration.

Are there existing tagging practices for indicating whether this face should be present or not? According to the diagram in Simple 3D Buildings § Terminology in the OSM wiki, it seems like the correct term for this wall face is "gable". Taginfo shows two tags that perhaps are used with this goal: roof:gable=yes/no and building:gable_wall=yes/no.

If I'm reading the Wikipedia article correctly, the former should represent only the triangular shape in the roof, using in the same material as the roof (so this would match the situation you illustrated above), whereas the latter would represent the entire wall extending upwards in a triangular shape to meet the roof, i.e. the triangle bit has the same material as the wall.

Does this sound correct to you?

from streets-gl.