how to set Interpupillary Distance for SimpleHMD plugin?

I just copy the builtin SimpleHMD plugin to my own project and got it worked at runtime, but dont know how to set the Interpupillary Distance. I tried to change the return value of FSimpleHMD::GetInterpupillaryDistance(), but no effect. any idea?? Thanks a lot.

Not sure about SimpleHMD, but there is a console command to set IPD:

stereo e=<value>

e.g. if you wanted leap IPD it would be “stereo e=0.04”, or standard ipd (64mm) would be “stereo e=0.064”