How to achieve while loop in SOP not VOP ,thanks

You could use the foreach SOP and use a stop condition: http://www.sidefx.com/docs/houdini13.0/nodes/sop/foreach [sidefx.com]

cklosters
You could use the foreach SOP and use a stop condition: http://www.sidefx.com/docs/houdini13.0/nodes/sop/foreach [sidefx.com]

Thank you, but it's not I want."stop condition“ can not use the variable inside the foreach sop.maby I should consider python script.

cklosters
You could use the foreach SOP and use a stop condition: http://www.sidefx.com/docs/houdini13.0/nodes/sop/foreach [www.sidefx.com]

Thanks Cklosters, that's really want I need!

I just tried this way, set loop iteration a high number(like 1000)and write a bit expression for “stop condition” like:
detail(“../some_node_inside_loop”,“stop”,0) == 1

than when this detail attribute be 1 the forloop will stop.