This one is difficult to explain, so bear with me :)

• Note: This does not appear to be a viewer-interesting type bug where objects can sometimes fail to render intermittantly.
  This is 100% reproducible for multiple people.

• When several of the "8f8 - primavera in Toscana" bags are rezzed in an area, this causes other objects rezzed close by to turn invisible.

• Freshly rezzed default prims, sculpted prims and mesh objects are affected.

• The severity of the problem depends on what you have RenderVolumeLODFactor set to in the viewer. The higher the setting the more severe the problem is.

• The default RenderVolumeLODFactor setting on Ultra graphics is 2.0, which is high enough to reproduce the problem.

• When the repro objects are removed from the scene, the problem disappears instantly for any RenderVolumeLODFactor setting.

  Steps to Reproduce - Part 1

• Set RenderVolumeLODFactor to 4.0
  Advanced -> Debug Settings -> RenderVolumeLODFactor
  Note that this is above the default setting for any graphics settings on the LL viewer but many people crank their RenderVolumeLODFactor to 4.0.
  The problem is very easily seen at this setting so lets start there.

• Note that the graphics quality setting does not matter - bug reproduces for all combinations of shaders.

• Teleport to the repro scene at http://maps.secondlife.com/secondlife/Testylvania%20Sandbox/53/182/1505

• Here you will see a cluster of green bags, "8f8 - primavera in Toscana" - the bags are the objects that cause the problem.

• Zoom camera view in and out and observe which objects in the scene are visible.

• Rez a default cube on the platform and observe whether you can see it.

  Observed Behaviour

• Most objects in the scene will be invisible when camera view is at close and mid distance ranges.

• When camera view is zoomed right out, the invisible objects will render.

• When camera view is zoomed closer again, the objects will be invisible.

• See the Fig 1 gif attached.

• When you rez a default cube on the platform it will be invisible.

• You can see the cubes selection outlines when held in edit but not the actual cube.

• If you zoom camera view out, the cube will render.

• If you zoom the camera view in again, the cube will be invisible.

• See Fig 2 attached.

  Steps to Reproduce - Part 2

• Now set RenderVolumeLODFactor to 2.0.
  This is the default setting when using the Ultra graphics setting.
  When RenderVolumeLODFactor is set to 2.0, the same problem reproduces but you must have camera view zoomed in closer to see the bug.

• Focus camera view on the blue default prim - see {}Fig 3{}.

• Zoom camera view in towards the plants sitting on the purple prim.

• Zoom camera view out again.

• Set RenderVolumeLODFactor to 1.0 and repeat.

  Observed Behaviour

• Even when RenderVolumeLODFactor is set down to 2.0, objects in the scene disappear when camera view is moved closer.

• See Fig 4 attached - some of the green bags, the blue prim and the prims around the plants are invisible.

• When RenderVolumeLODFactor is set to 1.0, this stops the objects turning invisible when camera view is closer but when camera view is moved further away, the mesh objects in the scene collapse and look crap.

  Expected Behaviour

  Objects in the scene should remain visible, especially at closer camera zooms.

  Other Information

• If you remove the repro green bags from the scene, or reduce their number down to ~5, the problem no longer reproduces.

• The repro bags have a pretty high vertex & index count.
  Is there some throttling of what gets rendered in the scene going on because of that?

Attachments

• Fig 1.gif 2015-06-10 20:16:04
• Fig 2.jpg 2015-06-10 20:24:57
• Fig 3.png 2015-06-10 20:54:25
• Fig 4 - LOD 2.png 2015-06-10 20:54:25
• vertices_indices.png 2015-06-10 21:03:36

Links

Related

• [BUG-40618] Recurrence of Bug-9439 - Objects disappear when highly complex meshes are present #12267

Duplicates

• [BUG-202611] ITEMS ARE TRANSPARENT UNLESS THEY ARE IN EDIT MODE #2948
• [BUG-225107] Zoom IN mesh objects disappear #3991

{
  'Business Unit': ['Platform'],
  'Date of First Response': '2019-08-14T11:39:29.196-0500',
  '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': 'Repro set up at: http://maps.secondlife.com/secondlife/Testylvania%20Sandbox/53/182/1505',
}