I have searched the web for a simple description of the Descriptive Geometry projections to convert a perspective photograph into an engineering drawing (3rd angle orthographic).
There are lots of discussions on the relationships between views, how to draw in perspective with arbitrary assumptions, deep technical texts on multilayered projections and lots of software matrix conversion theory - but no simple procedure that I could find.
I think I have developed the simple drawing projections to convert an orthographic drawing into a perspective sketch, and I intend to try and work those projections backwards.
I do not need any references to software routines or fancy photo manipulation programs, just the projections that one could utilize with pencil and ruler on a drawing board.
Can anyone point me to a suitable source ?
Is anyone interested in discussing the problem ?
The particular immediate application for me is a photo of a very old electric narrow-gauge locomotive that I will like to model in 5 inch gauge.
John.
There are lots of discussions on the relationships between views, how to draw in perspective with arbitrary assumptions, deep technical texts on multilayered projections and lots of software matrix conversion theory - but no simple procedure that I could find.
I think I have developed the simple drawing projections to convert an orthographic drawing into a perspective sketch, and I intend to try and work those projections backwards.
I do not need any references to software routines or fancy photo manipulation programs, just the projections that one could utilize with pencil and ruler on a drawing board.
Can anyone point me to a suitable source ?
Is anyone interested in discussing the problem ?
The particular immediate application for me is a photo of a very old electric narrow-gauge locomotive that I will like to model in 5 inch gauge.
John.
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