Forums Technical Discussion subdivision and bump problem

subdivision and bump problem

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luoqiulin
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here is a model i render it with PBR and Polygons As Subdivision,and use Mantra Surface in Material Palette and used bump map.
here is two render result all renderd in h11.0.733, the left one is used h11.0.547's Mantra Surface material the result is right. the right one is used h11.0.733's Mantra Surface material ,if i used bump map i found the Polygons As Subdivision is not been use or the reflection's normal is wrong.
so i want know the difference between h11.0.547 and h11.733's Mantra Surface Platte Material? i had never found is out!

Attachments:
bump.jpg (131.4 KB)

https://vimeo.com/user3971456/videos [vimeo.com]
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circusmonkey
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Hi,

You have true displacement checked on but have selected bump from the list ? . Surely you just want to uncheck the true displacement toggle then any displacement will render as a bump. If your still having issues please post up a very simple file showing the problem.
Scene file attached H.11.758 seems fine doing both bump and displacement.

rob

Attachments:
rse_bumpDisp.hip (1.5 MB)
bumpdisp.jpeg (100.5 KB)

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luoqiulin
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thank you circusmonkey
the problem is still there,here is a simple file,please check it out

Attachments:
sub_bump_problem.hip (1.5 MB)

https://vimeo.com/user3971456/videos [vimeo.com]
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zarti
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hi ,

not sure if this is the case and i do not remember the build number with which i had problems some times ago with reflection shading .. but here it is that thread ;

http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=21333 [sidefx.com]



.cheers
except the things that cannot be seen , nothing is like it seems .
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luoqiulin
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thank you zarti but not that problem either
https://vimeo.com/user3971456/videos [vimeo.com]
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circusmonkey
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Hi,
When I render sure it looks incorrect. So if its working in later build, just upgrade. If you read the journal you can clearly see there's been lots of improvements.

rob
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luoqiulin
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i have tried h11.0.733 and h11.0.763 neither ok, wish later version will be right!
https://vimeo.com/user3971456/videos [vimeo.com]
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circusmonkey
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As your not a Houdini NC user you should also submit something to support. Maybe they can explain whats happening.

rob
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