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Viewport bug

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GhostCrab
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Whenever I have a large amount of geometry visible in my view port I encounter a strange bug. Lines shoot all across the scene, and at times spikes of geometry shoot out of my objects.

Does anyone know how to cope with this? I am running Houdini 12 on a OSX mavericks.

here is what it looks like :

http://imgur.com/gW4MNah [imgur.com]

Thanks in advance!
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anon_user_37409885
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Can you try with the latest builds of H12.5 and which graphics card do you have?

There were many viewport fixes in H13.

Can you upload a test model that replicates this.

Thanks!
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GhostCrab
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My mistake, I am using Houdini 13.0.314

My graphics card is : ATI Radeon HD 5770 1024 MB

I have experienced the same issue running Houdini on my snow leopard MBP.

turning off the smooth sop seems to reduce the issue, while turning off the polywire sop seems to fix the issue.

Also interestingly enough I have encountered the very same error in Maya.

My file is attached. Thoughts?

Attachments:
fixMe01.hipnc (137.1 KB)

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anon_user_37409885
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It's the primitive circle at the start - make it polygon and all is good.
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GhostCrab
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Thanks for getting back. Unfortunately setting both circles to polygon has not improved things on my end. I've attached a photo of my view port after the changes.

Attachments:
Screen Shot 2014-03-01 at 8.17.44 PM.png (362.8 KB)

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malexander
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If Maya is doing the same thing, it could be a hardware problem. I had a Quadro 4000 that started behaving oddly just before it died (vertices randomly shooting off to different locations while tumbling with heavy geometry that stressed the GPU). It could possibly be an oveheating issue; check the GPU's heatsink and see if it's full of dust.
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anon_user_37409885
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Edit: point_fine_noise1 seems to the culprit!

Edit2: try attached, changed the stamp expression value from 4 to 1

It's probably not a viewport bug as the smooth sop with copySopy is causing the issue, and, you can ‘frame all’, shift-A, to see all the geometry.

I checked it again and saw the problem - not sure why changing to polygon worked first time! AMD 7950, OsX10.9.2, H13.0.334

Attachments:
fixme01_157_edit.hipnc (150.7 KB)

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Sadjad Rabiee
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Yes ,I Think so !

This is not a Viewport Bug ,Because I checked your file on 2 different PC with nVidia and ATI VGA ,But the results are same !!!

For example If I disabled “smooth SOP” or I cleared Variable6 in the Copy8 (“rndz” stamp expression) ,the problem solved !

Also as MartybNz said ,If you press “Space + G” to see All of the objects ,You can see the lines are limited ,But Usually in the Viewport Bugs ,The Lines are unlimited !
https://www.youtube.com/c/sadjadrabiee [www.youtube.com]
Rabiee.Sadjad@Gmail.Com
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GhostCrab
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Thanks for your help guys! I can finally move forward with my project.

One final question : It seems that it was a mathematical error in my expressions that caused this erratic behavior. Do either of you have any insight on what this error is so that I can avoid it in the future?
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anon_user_37409885
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Might be the turbulence expression is using an out of range value for depth. It was set at 4, in the manual the the range is -2 to 2

http://www.sidefx.com/docs/houdini13.0/expressions/turb [sidefx.com]
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GhostCrab
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Thanks!
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