This extensions helps setting up perspective views where a scale applies at a given depth, e.g. on a facade or a section cut.
By entering a scale, e.g. 1:100 or 1":5', and a plane for the scale to apply in, you get a height the view needs to be displayed with for the scale to apply. You can either use this height on a viewport in LayOut or export an image and use the height on the image in Adobe InDesign or a similar program.
For consistency between multiple perspective views, make sure the camera height matches, e.g. by activating Look Around and entering a height. Also make sure the viewing distance matches. I typically use a viewing distance of 20 cm.
Activated from Extensions > Eneroth Scaled Perspective.