How to Zoom with HTC Vive ?

[leon.fuchs]

Hello, 
is it possible to zoom with the HTC Vive? and when yes how ?

I tried it with:
vr_player->getPlayer()->setFov()

but it does not work.

Best wishes

[rohit.gonsalves]

Dear @leon.fuchs,

What are you doing is the only option I see.

Please check if your FOV mode is Vertical FOV than Physically based FOV. Use getFovMode(). Change it to desired mode using setFovMode()

When mode is FOV_MODE_VERTICAL  you can set vertical degrees FOV in degrees using setFov().

When mode is FOV_MODE_PHYSICALLY_BASED_CAMERA  you can set horizontal FoV using setFocalLength() and setFilmGate() (horizontal sensor size).

Try it it should work.

Rohit

[leon.fuchs]

Hello @rohit.gonsalves ,
I already tried that, the mode is vertical in my case.
I've also tried running it in fov_physical_based_mode, but unfortunately that doesn't work either. The zoom of the VR glasses unfortunately does not change with either of the two variants.

Leon

[silent]

  leon.fuchs

There is no easy way to do correct binocular vision (is that what you are trying to achieve, right?) in VR since each HMD has it's own projection matrices for each eye. They are hardcoded for each VR plugin since each HMD is working with only a very specific FOV.

mat4 left_projection = getUnigineMatrix(hmd->GetProjectionMatrix(vr::Eye_Left, znear, zfar));
mat4 right_projection = getUnigineMatrix(hmd->GetProjectionMatrix(vr::Eye_Right, znear, zfar));

If you will be able to change this value it will be quite obvious that it's not good approach. But if you want to experiment with that I can send you required plugin source code.

Thanks!

[leon.fuchs]

Hallo @silent,

If you could send me the successful plugin source code that would be very nice.

Thanks