def add_node(kwargs):
    
    ##Get node name and parm index
    sub = kwargs['node']
    index = sub.parm('poly_group').eval()
    record = sub.parm('record').eval()
    ifadd = index - record
    
    if ifadd > 0:
        for i in range(record+1,index+1):
    
            if i == 1:
                sphere_node = sub.createNode('sphere')
                box_node = sub.createNode('box')
                merge_node = sub.createNode('merge')
                switch_node = sub.createNode('switch')
    
                merge_node.setInput(0,box_node,0)
                merge_node.setInput(1,sphere_node,0)
                switch_node.setInput(0,merge_node,0)
                switch_node.setInput(1,sphere_node,0)
        
                sub.layoutChildren()
    
            else: 
                sphere_node = sub.createNode('sphere')
                box_node = sub.createNode('box')
                merge_node = sub.createNode('merge')
                switch_node = sub.createNode('switch')
        
                name = 'switch' + str(i-1)
                ex_switch = sub.node(name)
                sphere_node.setInput(0,ex_switch,0)
                merge_node.setInput(0,box_node,0)
                merge_node.setInput(1,sphere_node,0)
                switch_node.setInput(0,merge_node,0)
                switch_node.setInput(1,sphere_node,0)
        
                sub.layoutChildren((),-4,1)
    
            switch_node.setDisplayFlag(True)
    
        ##set parm chanel link 
   
            pathx = 'ch("../sphere' + str(i-1) + 'x")'
            pathy = 'ch("../sphere' + str(i-1) + 'y")'
            pathz = 'ch("../sphere' + str(i-1) + 'z")'
    
            sphere_node.parm('tx').setExpression(pathx,None,False)
            sphere_node.parm('ty').setExpression(pathy,None,False)
            sphere_node.parm('tz').setExpression(pathz,None,False)
    
    else:
        for i in range(index+1,record+1):
     ##delete nodes       
            switch = 'switch' + str(i)
            merge = 'merge' + str(i)
            box = 'box' + str(i)
            sphere = 'sphere' + str(i)
            
            sub.node(switch).destroy()
            sub.node(merge).destroy()
            sub.node(box).destroy()
            sub.node(sphere).destroy()
            
    sub.parm('record').set(index)

def clear(kwargs):
    
    sub = kwargs['node']
    sub.parm('poly_group').set(0)
    sub.parm('record').set(0)
    
    for node in sub.children():
        node.destroy()
        
def add_path(kwargs):
    
    node = kwargs['node']
    index = node.parm('path').eval()
    totalpath = ''
    for i in range(1,index+1):
        subpath = node.parm('sub_path'+str(i)).eval()
        totalpath += subpath
        
    node.parm('total_path').set(totalpath)
    
def add_matrial(kwargs):
    
    node = kwargs['node'].parent
    path = '/stage/materiallibrary1/principledshader'
    path2 = '/stage/materiallibrary1/layermix1'
    prin_node = hou.VopNetNode(path)
    mix_node = hou.VopNetNode(path2)
    
    
    mix_node.setFirstInput(prin_node,2)
    prin_node.bypass(on)
    
express = '''a = 'aaaaaa'\nreturn a'''

def add(kwargs):
    node = kwargs['node']
    a = node.parent().createNode('groupcreate')
    a.setExpressionLanguage(hou.exprLanguage.Python)
    a.parm('basegroup').setExpression(express,None,False)