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This is where I struggle with Brics 3D - there must be an easy way.
Attached, the roof battening plan (Block) is in horizontal plane. Below it, roof plane sloping at 10o pitch.
How to project the 2D plan view of the purple battens 63mm wide x 38mm high, so they're created in 3D lying on the sloping roof surface?
I can easily achieve it a kludgy way,
but this is to see if in general there's ways, when creating an entity with UCS set to say a 10o slope, to align it with a guide-line that's part of a horizontal 2D plan that's vertically above it, i.e. not perp to the 10o slope, not Polar to the 10o sloped UCS.
Or to say move, extrude or push-pull the entity till it aligns with a face, edge or guide-line that's not perp to the 10o slope, not Polar to the 10o sloped UCS.
Like in 2D I can EXtend a line-entity to another guide-line - it's to do similar in 3D bearing in mind the different planes and perps involved.