that stroke glossy shading...

HI !
I try to sculpt in blender but, the default viewport material comes with a stroke glossy shading on object that are annoying me and i cant focus on sculpting. is there a way to get rid of that glossy Stroke shadow and make the material be more mat(lustreless) ?!!!

thanks!

Use an appropriate Matcap material (properties panel)
Adjust the opengl lighting - User Preferences / System or http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/3D_interaction/QuickPrefs

hi,
the matcap materials are fine but, I can not adjust color for them and thatS the reason why i can not use them. I followed a tutorial on how to import mat cap from zbrush and it workS fine but then the viewport performance are slowing down… so , I try to find other ways to do the trick… maybe someone knows how to do it.