Focus adjustment problem with VR glasses, causing discordant images and strabismus sensation

[inakiLakunza]

Hi,

First of all, thanks for the amazing work done. Instant-ngp has allowed me to recreate huge scenes with great precision and without large amounts of training time.

I have come across a problem and I would like to know if there exists a way for me to solve it or alliviate it. When using VR glasses with instant ngp, I have noticed that there is an adjustment problem between each eye's view. Especially when viewing close objects, there is a sensation of strabismus because the image being viewed by each eye is unnaturally displaced with respect to the other.
The following images show the exaggerated displacement between the two views:

I have looked at the code underneath and I have found this block in the testbed.cu file:

                    // Apply the VR pose relative to the world camera transform.
	        m_views[i].camera0 = mat3(m_camera) * views[i].pose;
		m_views[i].camera0[3] = vr_to_world(views[i].pose[3]);
		m_views[i].camera1 = m_views[i].camera0;

I see that te last line sets the same information of camera0 to camera1, but I haven't found where the relative displacement between both of them is created.

I would like to know if there exists a way to fix this problem, or how can I modify the relative view of one image respect to the other.

Thanks in advance