Lighting dark in stereo mode

[kenneth.satyshur@…]

Begin forwarded message:

From: Kenneth Satyshur
Subject: [chimerax-users] 3D stereo lighting is not the same as mono
Date: May 23, 2020 at 4:39:39 PM PDT
To: "chimerax-users@…" <chimerax-users@…>

I am using version 1.0 in Centos7 with Nvidia 3D glasses and K4000 video card. I do all my work in 3D stereo. Especially density fitting. I noticed that the lighting is different in mono vs stereo mode. When i go to stereo mode with

camera stereo

the image is in stereo but the "full" lighting is on and the image is very dark with shadows. If I switch to 'simple' it is bright and has weak shadowing. Switching to 'soft' the image is flat black and can only be seen with white background but contains no atoms. I think this is a bug.
But a Great improvement in rendering of images.
thanks
kas
p.s. old chimera does stereo very well on my system
Linux kenworkathome 3.10.0-1127.el7.x86_64 #1 SMP Tue Mar 31 23:36:51 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

Kenneth A. Satyshur, M.S., Ph.D.
Senior Scientist,
Department of Bacteriology: College of Ag and Life Sciences;
Departments of Bio Molecular Chemistry,
Neuroscience, Oncology, and Carbone Cancer Center:
School of Medicine and Public Health;
and the School of Pharmacy
University of Wisconsin-Madison
Madison, Wisconsin, 53706

[Tom Goddard]

I don't have access to a stereo system to test this, probably will not have access for a few months.

The lighting is working correctly with other two-eye rendering such as VR and SBS (side-by-side). Does the shadowing get dark for you after "camera sbs"?

Possibly there is some bug with how the quad-buffered stereo mode is being used during shadow calculation. But the shadow maps are calculated in off-screen buffers so that should not matter. The lighting problem may be a graphics driver bug.

[Tom Goddard]

This is very likely the same problem as #3226 that everything inside mesh surfaces is dark when ambient shadows are used. The fix for that bug should fix this problem which I suspect is not related to stereo.