How to find traces that are not a 45 degree in layout?

That one is a bit more obscure.   Curious what is driving this requirement?

Some of the traces in the layout were routed at free-angle or edited by vertex command. Need to return them back to 45 degree style. It's a manufacturer requirement. 

Unless your airgap minimum is less than 0.07mm or less,  I would question that.   It's a chemical process, etching the copper.   For a conductor, it's never going to come out perfect unless you use MCM or chip lithography etching methods and unusually thin copper in the stackup. 

I think a skill script can be written to flag any trace segment that isn't orthogonal.  The trigonometry is straightforward and you have a full set of Trig functions in SKILL.

u can find traces that r not a 45 degree angle.

first, u select "cline segs" in the find filter.

then u select clines and run the "show element" command.

u will see the element of each cline and the angle of each cline. 

an example is shown below.

the middle cline has a 20.905 degree angle but others have a 45 degree angle.

u can place them in the excel sheet and sort them out to find angles that are not a 45 degree.

u can also set up the design level drc by using the analysis mode on setup --> constraints --> modes

please look at the article as well.

https://www.flowcad.ch/fr/newsarea/blog-why-move-up-to-orcad-allegro-17-2-2016-new-design-level-checks.html