This is not a new problem but I have a fairly solid repro so thought it worth a fresh issue.

This has been a problem since the viewer-interesting changes and has been filed several times already.
I linked the related issues.

Steps to Reproduce

• You should be able to reproduce this on any graphics quality settings, but to make the repro easier, set draw distance to ~ 350m.
  Apart from raising the draw distance, default High settings should be fine.
  Also note that the value of RenderVolumeLODFactor does not matter - even if you raise RenderVolumeLODFactor to 4 in debug settings, the bug will still reproduce.

• Teleport to http://maps.secondlife.com/secondlife/Surprise/145/74/3515 and wait for the region to cache.

• After the region has cached, relog to last location.

• After relogging, cam (or walk) around the platform and observe the trees and bushes and whether their foliage is visible or not.

• Double click teleport around the platform and observe whether the foliage of the trees and bushes disappeared after the teleport.

• There is another way to intra-region teleport on this region which reproduces the bug really well:

  • Bump into the doors at http://maps.secondlife.com/secondlife/Surprise/147/72/3516 and you will be offered a HUD.
  • Accept the HUD and wear it and grant the HUD teleport rights when asked.
  • Walk through the doors and you will be teleported approx 400m below.
  • To go back to the platform where the trees are, walk back through the doors and you will be teleported.

• When the bug reproduces, right click the broken trees & bushes to fix them and then perform another intra-region teleport.

  Observed Behaviour

• Often when logging in at the repro location or after an intra-region teleport, random trees will have lost LOD, particularly on the foliage which is a seperate part of the linkset and they show at lowest LOD.
  Some of the bushes will be displaying lowest LOD (pretty much vanished).

• From one side these trees will look like their foliage is invisible - See Fig 1 and Fig 3

• From the other side, you will see the foliage is there, but loaded at lowest LOD - see Fig 4

• When the bug reproduces, if you walk right up to a tree that displays with broken foliage, the foliage will not load.

• If you alt+click on a broken tree and cam really close to it, the foliage will not load.

• If you right click a broken tree, the foliage instantly appears and loads at full LOD - See Fig 2 and Fig 5

• Sometimes zooming camera way out and back will force the foliage to correctly load but not always.

• Fig 6 animated gif shows the problem still reproducing when RenderVolumeLODFactor is set to 4

• This problem happens everywhere but is very easy to reproduce at this location - it should only takes you minutes to reproduce it.

  Expected Behaviour

  Objects should load at correct LOD at login.
  Objects that were displaying at correct LOD should not break after an intra-region teleport.

  Other Information.

• This bug is not limited to rezzed objects, it also happens to worn attachments (particularly mesh) at login or after a teleport - see BUG-6803

• I cannot reproduce this bug on a pre-interesting viewer: Second Life 3.7.7 (289441) Apr 22 2014 11:15:59 (PreInteresting)
  http://wiki.secondlife.com/wiki/Release_Notes/Second_Life_Release/3.7.7.289441

Attachments

• Fig 1 - Broken Trees.png 2015-03-18 20:08:23
• Fig 2 - Trees after right clicking.png 2015-03-18 20:08:23
• Fig 3 - missing foliage.png 2015-03-18 20:34:05
• Fig 4 - foliage at lowest LOD.png 2015-03-18 20:34:05
• Fig 5 - After right clicking.png 2015-03-18 20:34:05
• Fig 6.gif 2015-03-18 20:45:34

Links

Related

• [BUG-5978] Rendering problems with Project Interesting viewer #13880
• [BUG-6803] Mesh models sometimes fail to load completely #14612
• [BUG-7547] Objects that derender when camera is zoomed out do not rerender when camera view is reset to default - only happens on Interesting based viewers. #15243
• [BUG-20030] [MAINTENANCE] Return of Mesh Not Displaying at Proper LOD #2734

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  'Business Unit': ['Platform'],
  'Date of First Response': '2015-03-19T15:49:24.152-0500',
  'Severity': 'Unset',
  'System': 'SL Viewer',
  'Target Viewer Version': 'viewer-development',
  'What just happened?': '.',
  'What were you doing when it happened?': 'Filling in...',
  'What were you expecting to happen instead?': '.',
  'Where': 'http://maps.secondlife.com/secondlife/Surprise/145/74/3515',
}