Don't extrude from the highest subdivision level, if you're working around 6 million polygons, that's a fair amount of information for zbrush to process when trying to create the extraction. Do it on a lower level and you should be able to extract just fine. You could also try creating the needed strip with a zsphere…
Hi does anyone know any tutorials on how to create boots or shoes? i found a few tutorials but there is one that i am clueless and seems to be the easiest and best of them all... here are the ones i found Callahan Sketchbook The only thing about this tutorial is i dont understand how he got the shoe lip were the laces…