Cool VL Viewer forum

Yes, you will have to run the Windoze viewer under wine...

I found a place where the sky color flashes, and it happens after many relogs. See attached image composed of two photos (Normal rendering is on the right half of the image). It is visible with my own EEP daycycle, any day preset, and the server side default sky. In this particular location, the effect is seen to me when facing the particular direction as seen in the image. You may need to cam (CTRL+ALT+click) around using your avatar as a focal point some in order to see the 'flash' as the range of the effect in this spot is rather narrow for some reason. After taking the photos, I also saw the effect when rotating to see more of the sky. I have seen this effect happen since the experimental 1.27 releases, but I did not have an account to make posts in the forum back then.

Also tested with Second Life Test 6.4.5_121740 available from https://bitbucket.org/Drakeo/viewer/downloads/ (use at your own discretion)
and Kokua FTRLV 6.4.4_48550 available from https://sourceforge.net/projects/kokua. ... inux64Bit/
neither of which showed the issue, which may or may not be relevant due to many variables. However, all viewers used advanced lighting model, 128m draw distances, and RenderVolumeLODFactor of 2.

https://maps.secondlife.com/secondlife/ ... 164/242/33

System note: I did a clean install of Ubuntu 20.04 MATE yesterday. Kernel and Mesa are official Canonical versions and all system updates were applied after the installation.
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Cool VL Viewer v1.28.0.2, 64 bits, Jul 11 2020 10:12:18
RestrainedLove viewer v2.09.27.23
Release Notes

You are at 256163.7, 262898.3, 32.7 in Berbera located at
sim10385.agni.lindenlab.com (216.82.51.35:13001)
Second Life Server 2020-06-12T19:06:40.543526
Release Notes

CPU: AMD Ryzen 3 1300X Quad-Core Processor (3483.44 MHz)
Memory: 16023MB
OS version: Linux-x86_64 v5.4.0-40-generic #44-Ubuntu SMP Tue Jun 23 00:01:04 UTC 2020
Memory manager: jemalloc v5.2.1-20200630
Graphics card vendor: X.Org
Graphics card: Radeon RX 580 Series (POLARIS10, DRM 3.35.0, 5.4.0-40-generic, LLVM 10.0.0)
OpenGL version: 4.6 (Compatibility Profile) Mesa 20.0.8
Detected VRAM: 7978MB
J2C decoder: OpenJPEG: 1.4.0.635f
Audio driver: FMOD Studio v2.01.01 (PulseAudio)
Networking backend: libcurl/7.47.0 OpenSSL/1.0.2u zlib/1.2.11
Embedded browser: CEF3 plugin v74.1.19+gb62bacf+chromium-74.0.3729.157
Packets lost: 13/36133 (0.0%)

Built with: GCC v4.8.5
Compiler-generated maths: SSE2.

Compile flags used for this build:
-O3 -fno-delete-null-pointer-checks -falign-functions=16 -falign-jumps=16 -fno-align-labels -fno-align-loops -fno-ipa-cp-clone -fsched-pressure -frename-registers -fweb -fira-hoist-pressure -DNDEBUG -std=c++11 -fPIC -pipe -g -gdwarf-2 -gstrict-dwarf -fno-var-tracking-assignments -fexceptions -fno-strict-aliasing -fvisibility=hidden -fsigned-char -m64 -mfpmath=sse -fno-math-errno -fno-trapping-math -pthread -fno-stack-protector -Wall -Wno-reorder -Wno-unused-local-typedefs -Werror -D_GLIBCXX_USE_C99_MATH=1 -DLL_LINUX=1 -D_REENTRANT -DXML_STATIC -DLL_USE_JEMALLOC=1 -DLL_ELFBIN=1 -DLL_LUA=1 -DOV_EXCLUDE_STATIC_CALLBACKS -DLL_FMOD=1 -DLL_OPENAL=1 -DLL_SDL=1 -DLIB_NDOF=1 -DLL_X11=1

I'm there... Same settings as the ones you cite. I've been trying to reproduce the issue for the past 10 minutes... Nothing wrong on my screen...

Not being able to reproduce this issue myself but trying to figure out why it would happen in my viewer and a not in others, I am reviewing the various changes that I made when compared to LL's code and will need your help to test potential solutions.

Could one of you please change the code in linden/indra/newview/llvovolume.cpp from line 1589 to line 1600 to read:
(i.e. disabling my workaround), and recompile the viewer to test the result, please ?

I just tried the suggested edit and it doesn't seem to affect the issue. The sky will still flash to what looks like 'fullbright' and then back to a 'dimmer' version as I rotate my av/cam in place, in some regions.

I haven't had a chance to install all the Wine subsystem packages for my rig to test the official Windows viewer. Have been avoiding Windows apps for so long.

Ok, thanks.

Another idea, that does not involve recompiling the viewer to test it: what happens if you un-check the "Enable object-object occlusion" box in the "Preferences" floater, "Graphics" tab, "GPU features" sub-tab ?

Interesting. I thought I had tried that before I created the OP, but maybe not. When unchecking that my frame rate drops dramatically but the issue also goes away. I have tried both places that I was having the issue and the sky is 'normal' without that setting enabled.

OK, I think I may have an idea then: what happens if you change line 2649 of linden/indra/newview/llpipeline.cpp to read:
(i.e. removing "!gUseNewShaders &&" from it) and recompile the viewer ?

The removal of !gUseNewShaders doesn't seem to have an effect. Would I need to clear cache or toggle anything while testing?