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Open3D: A Modern Library for 3D Data Processing
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Object gets darker when moving camera forward/backward (mousewheel) #1905

Closed andreas-geiger closed 2 years ago

andreas-geiger commented 4 years ago

Describe the bug

Dear Open3D, I am Andreas, working with Vladlen and my team on BRDF estimation and we like to use the Open3D viewer for visualizing our results. However, I encounter a strange behavior that other users seemingly don't have:

When opening the girl.obj file from this archive http://www.cvlibs.net/shared/girl.zip with open3d, rotating the object such that it faces the camera and then moving forward using the mouse wheel, the object becomes darker:

bug1 bug2 bug3

However, I only moved forward, I didn't change any lighting settings. It also happens in fly mode when pressing "W" for moving forward".

To Reproduce Steps to reproduce the behavior:

  1. start Open3D
  2. open girl.obj from the zip file above
  3. rotate to face towards the camera
  4. use mouse wheel

Expected behavior I would expect the light / shadows not to change if the camera moves closer.

Screenshots Screenshots are attached and in the zip (bug1-3.jpg).

Environment (please complete the following information):

Would be great to get your help with this. Happy to give more info if needed. Thanks a lot. Great tool by the way - it will help us a lot in our research!

Prof. Andreas Geiger Autonomous Vision Group University & MPI-IS Tübingen andreas.geiger@tue.mpg.de

germanros1987 commented 4 years ago

Thanks @andreas-geiger, we are looking into it. We are trying to reproduce the error, which seems to require Intel graphics in Linux.

We will solve it soon!

prewettg commented 4 years ago

I can reproduce the problem with stock Ubuntu 18.04 and Intel Iris+ 655 integrated video. It appears to be related to SSAO, as commenting out FilamentView.cpp:84 (the line about SSAO) eliminates the symptoms, as does turning off environment mapping. I have attached a video. I am not sure that this is our bug, as there are reports of it happening in Valve's Source engine and on Windows as well as Linux: https://github.com/ValveSoftware/Source-1-Games/issues/2523 One solution with Left 4 Dead was to enable stenciling for tonemapped occlusions in the game's settings (maybe this is a hint as to the cause?): https://www.reddit.com/r/l4d2/comments/4rm90g/darkness_bug/ The same report mentions that it happened with an old nVidia card, too.

I have attached a video, in case it helps further troubleshooting. bug.mp4.zip

prewettg commented 4 years ago

Problem appears to be the Intel driver in Ubuntu 18.04. I booted using the Ubuntu 20.04 Live CD and it did not show the problem.

errissa commented 4 years ago

@andreas-geiger Did the solution suggested by @prewettg work for you or has the problem persisted?

andreas-geiger commented 4 years ago

Hi Rene,

I didn't have time to setup my laptop anew, but I found that (at least with the latest version) the problem is mainly caused by the HDR environment map. I don't need this, and if I disable it, the problem goes away, so its fine for me.

It would actually be nice if there is a way to keep settings for future launches to the program, such that (for instance) HDR maps don't need to be disabled or sun intensity doesn't need to be increased whenever starting the program. Or maybe some config file or parameter options..

Anyways, the tool is a great help for us.

Best, Andreas

On Thu, Jul 30, 2020 at 3:55 AM Rene notifications@github.com wrote:

@andreas-geiger https://github.com/andreas-geiger Did the solution suggested by @prewettg https://github.com/prewettg work for you or has the problem persisted?

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/intel-isl/Open3D/issues/1905#issuecomment-666033210, or unsubscribe https://github.com/notifications/unsubscribe-auth/AFJBYX24AMQVVTYDVRPGIYTR6DHHJANCNFSM4NM2WDWA .

germanros1987 commented 4 years ago

Hi @andreas-geiger we will add your request. This should be doable.