strange cardboard behaviour

Hi guys!
We're creating a VR version of the Terraemotus (Reggia di Caserta) project.
We're experiencing a strange behaviour in the 2015 cardboards: we have an excessive distortion of the objects in the scene (i.e. pictures on the wall have wrong aspect ratio) and the depth of the whole scene appears very flattened.
We're using the hmd_conf window in the app to set the correct parameters of carboard and phone screen, but we have not been able to fix this issue (at the moment chrome browser mobile is our testbed).
Have you got any hint for us to force the app behaviour for cardboard 2015?
TY very much!

Thank you for feedback.
These is a bug and it will be fixed to the upcomming release (16.09).

wow, ok! ty! so.. is the bug already fixed in the 16.09 early developer preview?

It is fixed in the release candidate (16.09).

ok, we tried it and the aspect ratio is now fixed!
but a problem is still there because our app can't use correctly the hmd parameters.
When we set in the hmd_conf window the cardboard 2015 profile [0.34, 0.55] and then we put the correct screen size, then save and reload, the view is still too much distorted.
If we set the distortion to [0,0] (using hmd_conf window) the view is really better and there is only a small distortion in the corners

You can try with this temporary link
https://hpc-forge.cineca.it/files/visit_3Dmodels_VR/public/terraemotus_1609/terremotus/terremotus_hmd.html

Any thoughts?
Luigi

We also noticed that the distortion shader definitely kills the fps…
Hoping that WEBVR will be better optimized in the future!

Hi Luigi, we are currently looking at this.

still too much distorted.

What do you mean? Does correction distort a picture too much?

If we set the distortion to [0,0] (using hmd_conf window) the view is really better and there is only a small distortion in the corners

I can't reproduce. Could you send a screenshot?

We also noticed that the distortion shader definitely kills the fps…
Hoping that WEBVR will be better optimized in the future!

Did you tryed to install Chromium build or Firefox Nightly Build (v51)? There should be a performance boost.