Zebra stripe curvature

For the iso lines you can do something like this (pseudo code for OCC 6.7.1!):
AIS_InteractiveContext.DefaultDrawer().UIsoAspect().SetNumber( uCt );
AIS_InteractiveContext.DefaultDrawer().VIsoAspect().SetNumber( vCt );

Dear Laszlo,
1)"zebra stripes".
I guess that rather environment map is meant (if I am wrong, correct me, please).
Using a "zebra stripes" environment map is a popular and simple method to check the curvature visually (we have some experience of using it in the past). See below Draw reproducer:

pload ALL
restore data/occ/bottom.brep b
# compute fine triangulation to obtain better "zebra stripes"
incmesh b 0.01 1
vinit
vsetdispmode 1
vdisplay b
vfit
# applying standard "striped" environment texture
vtextureenv on 6

The obtained result is attached to the post (zebra_stripes.png).
In order to get better stripes, it is necessary to prepare the texture image file in a special way (in 2:1 format, stripes should look like arcs in fact in order to pass through sphere mapping as needed) or generate it programmatically.
Also the analogical result can be obtained using "shader's" technique, but it requires more efforts.

2). "isolines"
It seems a strange question, since isolines are automatically displayed in wireframe mode. The number of isolines can be adjusted through presentation aspects.
Best regards
FSR