Photoshop CC 2015 3D extrusion artifacts

hi all,

hope day going better mine.

ok may 4th 2016 , problem thought fixed in 2012 has resurfaced. no matter how try , tool or function, either native shapes, pixels or imported illustrator outlines, nasty extrusion peaks , troffs when rendered @ highest setting.

 

i attach screen shots take @ have exhausted knowledge , need assistance of higher power

 

the photoshop document 2400 x 1713 px @ 72dpi rgb.

 

here getting:

i have tried different resolutions file no change. have been working photoshop 3d while no nubie. seems have happened @ last update.

 

 

please assistance prevent me doing again in cinema4d, received indeed.

cheers

david

can post steps did create this? tried extrusion on circle, , i'm not getting same results.

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