hi everyone.
I can't find where its possible to change the angle value for the smoothing of the shading between the polygons edges.
I have to use a facet sop? there isn't any value i can change without adding any nodes?
the problem started when importing a geometry inside houdini, i noticed it had only hard edges. and I want smooth edges :?

it may be that your geometry is coming with vertex normals
middle click on the File SOP and see if it's coming with N in vertex atributes

you can easily delete it with Attribute SOP to get smooth normals
OR
to set that angle directly you can use Vertex SOP/Cusp Normals

Facet SOP will disconnect polygons to make hard edge, which is usually not good
But if you have polygons disconnected already then you must Fuse SOP them first

thankyou very much for the answer

yes, my geometry file have this info:
2 Vertex attributes: uv , N

i don't know how to perform the two operations you mentioned.
how can I delete it with the Attribute SOP?

or maybe can you link a website to understand more about normals and editing normals in houdini?

append Attribute SOP, and in Vertex Tab type N into Delete Attributes field

or append Vertex SOP, and change Keep Normal to Cusp Normal and adjust Angle slider

to gain more info on normals, attributes and other stuff
you can start here http://www.sidefx.com/docs/houdini11.0/ [sidefx.com]
just search for normals

it worked. thankyou!