potential bug in jit.gl.material…or am I having hardware issues?
Hello. I’ve recently run across some very strange behavior in jitter. I have a simple patch that creates a number of spheres in the pattern of a grid. I set the middle one to be red.
Now, if I connect the jit.gl.material object to either the jit.gl.multiple object or the jit.gl.gridshape object the middle sphere goes back to being uncolored and a different sphere turns red! As soon as I disconnect the jit.gl.material object things go back to normal and the middle sphere becomes the red one again. I have attached images of this behavior (in case you don’t believe me) as well as the patch.
I’m running windows 7. The graphics card in my desktop machine is pretty unsophisticated. I’m using the Radeon HD 4250 on my motherboard.
I tried the same patch on my laptop (also windows 7) which uses an on-board Intel GPU and I did NOT see the same behavior. Everything worked as expected. Can anyone explain this? Do I need a new graphics card for my desktop?
-- Pasted Max Patch, click to expand. --Copy all of the following text. Then, in Max, select New From Clipboard.----------begin_max5_patcher---------- 880.3oc4X0saaBCF85To9NXwUsRocXa9cW08bTUU4.tTW4Xy.m1rUs28YrCc IogDJDHQZJRXwmAy463i+7w48KuXhyL4RZoC36f6ASl7tNxDSrpHSpCLwYNY YBmTZdPm4zxRRF0Y5pNUzkJSGkTEgyAteziXwblfSUl2CsVT4BUcXXc3mjBk fLmZFpeTvH7OFG6iq9UN0hTGGvC08wRMufb1K2.ibVevJY+177Pzst0wyIpj mYhrGKnIJ6fA8iz8Cfd9UMdwlazg.OXdm+b4EUs5loslglsPojhcSCvCPCeJ WmQDYMjuXm8kWn.adgqZPt0W6QdsuY9bNQPQo.r9mK.dpz.9cQBffwqIAftG CMff9lFOelpdgotcNQUvVpIpm3RhBi.gfvujZA0EBS+kez9kcl1D8g2M8g2O 84Au0WSXwAlFrmQpAGL5KiWwfzMx1MXsniHq0LWg5T0F6xQuJ5QyUZl0u2KK O.WkUvRKeljSA4yuIQs77PoA85hTK1Pad9wVkV3.qzdiIRkuMZ7loTeyLlaW XLOeOqfCsVssgcwYAUjRKVwZf6RzYeAQuofdaA2SMIF2CNDGtRuMjxNEXFPS WkzwioretcRWQ8gtraDDdL1NPIyx3z0r6TnyQ8V.OREjYbCnbON1sXB0tohP mCmxnv3ilYqlDH+Tm3ERM6N7Vr1i0SXeDFtVgA7HHLZzRp6snSkGTDpKjCN1 Vg1JgvHqkpwyCJ7LwWfeOHODzdVNTz.VgVyWo1RmcofyQZ8WP2cOgLaeEMzd mnKyK.2YtdUBkyu28gatJkMupEd82PWuJLbUXXc3+4QfyDzD4BgYP89JqlGN 4oKrOLucIt8j4AA+Gd.y3vtSei5ALWvUrbd8YlzT4cYbisiRPtrjoXRAHQxk EfxDBuA2Z3Q4fn8nV.NFa2swsQJ09IMqE29OJzLrUcrEQWJWTjTi6UGUV69+ CrmRKULAohCW6gB17gdlklREa3rKkUV41yj4tMOy2ZXUIFOLtLK4GYjE0FfE eRfE77CVsaZb7mECZEt7Fcb42FbgGcXgaaUB3nBKTqpdA8Gc9BFcdNOBakte 6humM.a646w.X9sU5iFWbgOSUXv1fqnwGWtvg2oyJCYj77WoEkqFYKlzVbeQ VTcevT68Lg8d6H6TPekU+Jg5HlQUe4u.b9Or9A -----------end_max5_patcher-----------
A series of clear repro steps to follow can benefit you and those trying to assist. Without it, I don’t know what to do.
I played around with it and saw no issue on my machine. But clear repro steps might assist.
could it be that somehow the gridshape is drawing itself and then gl.multiple is drawing it as well? If that is what’s happening, the instance gl.multiple draws in the same place as the original gridshape will not show up and it’s entirely possible for the two to have different materials. You can post a patch with Edit > Copy Compressed so we can reproduce and provide better feedback.
Thanks for the replies.
@Wesley I did post the compressed patch. Look right above the pictures and below my post.
@diablodale There really are no repro steps to speak of. I simply connect the jit.gl.material object to the gridshape object (as shown in the images) and the red sphere switches places. But everything works perfectly when I open this patch on a different machine which made me wonder if it is a hardware compatibility issue.
oh yeah :) you did!
I had a look on OSX and didn’t see this behavior at all. Clearly something is going on, but I can’t reproduce without having a machine with the same specs. Only thing I can think of to do is to see if you can find a newer version of your graphics card’s OpenGL driver.
So I got a new video card and the problem went away. Very strange. I wouldn’t have thought that hardware incompatibility issues could create this type of an error… but there you go. Thanks for the responses.
I never did find a solution to this problem. As I said, the problem went away when I switched from on board video to a dedicated graphics card. However I now have a standalone app that I want to distribute and some of my beta testers have seen this problem.
I would appreciate it if someone running Windows with on board video would open the test patch included in the original post and let me know if you can reproduce this bug.
And if anyone has any ideas about what could be causing this strange behavior I would be very interested in hearing your thoughts.
did you try @automatic 0 and @auto_material 0 attributes for jit.gl.gridshape ?
To debug this issue I disconnected my video card from the power supply and switched back to using onboard graphics. Sure enough the problem came back.
I just discovered that by deleting the jit.gl.material object all of the strange behavior goes away! Can anyone explain this? Are there system requirements for using jit.gl.material or other openGL objects?
vichug, I tried your suggestion but it had no effect
Forums > Jitter