The answer is that the pipe's radius is 18.2 inches
Answer:
The easiest thing to do in you situation would be to use references from other drawings or real pictures, and make sure you use a consistent light source. Sorry if this doesn't answer you question but these are some tips.
Depending on what you belive in, you go there.
For me, I don't really believe in anithing apart from been reancardnated for my next life right after I die.
Work with the creative team to come up with ideas.
Design the lighting needed for the performance.
Be aware of health and safety aspects.
Write a lighting plot/script to note where there are any lighting changes.
Attend technical rehearsals.
