node_Bisect.py

import bmesh, mathutils
from mathutils import Vector, Matrix
from node_s import *
from util import *
from math import *
import copy
# based on CrossSectionNode
# but using python bmesh code for driving
# by Linus Yng

def bisect(cut_me_vertices, cut_me_edges, pp, pno, outer, inner,fill):

    if not cut_me_edges or not cut_me_vertices:
        return False
   
    cut_me_polygons=[]
    if len(cut_me_edges[0])>2:
        cut_me_polygons = cut_me_edges.copy() 
        cut_me_edges=[]

    bm=bmesh.new() 
    bm_verts =[ bm.verts.new(v) for v in cut_me_vertices]
    if cut_me_edges:
        for edge in cut_me_edges:
            bm.edges.new((bm_verts[edge[0]],bm_verts[edge[1]]))
    else:
        for face in cut_me_polygons:
            bm.faces.new([bm_verts[i] for i in face])
             
    geom_in = bm.verts[:] +bm.edges[:]+bm.faces[:]
    res=bmesh.ops.bisect_plane(bm,geom=geom_in, dist=0.00001,
                                plane_co = pp, plane_no = pno, use_snap_center = False, 
                                clear_outer= outer, clear_inner = inner)
    # this needs work function with solid gemometry
    if fill:
        fres = bmesh.ops.edgenet_prepare(bm, edges=[e for e in res['geom_cut'] if isinstance(e,bmesh.types.BMEdge)])
        bmesh.ops.edgeloop_fill(bm, edges = fres['edges'])
    edges = []
    faces = []
    bm.verts.index_update()
    bm.edges.index_update()
    bm.faces.index_update()
    for edge in bm.edges[:]:
        edges.append([v.index for v in edge.verts[:]])
    verts = [vert.co[:] for vert in bm.verts[:]]
    for face in bm.faces:
        faces.append([v.index for v in face.verts[:]])
    bm.clear()
    bm.free()

    return (verts,edges,faces)


class SvBisectNode(Node, SverchCustomTreeNode):
    bl_idname = 'SvBisectNode'
    bl_label = 'Bisect'
    bl_icon = 'OUTLINER_OB_EMPTY'
    

    inner = bpy.props.BoolProperty(name='inner', description='clear inner', default=False, update=updateNode)
    outer = bpy.props.BoolProperty(name='outer', description='clear outer', default=False, update=updateNode)
    fill = bpy.props.BoolProperty(name='fill', description='Fill cuts', default=False, update=updateNode)

    def init(self, context):
        self.inputs.new('VerticesSocket', 'vertices', 'vertices')
        self.inputs.new('StringsSocket', 'edg_pol', 'edg_pol')
        self.inputs.new('MatrixSocket', 'cut_matrix', 'cut_matrix')
        
        self.outputs.new('VerticesSocket', 'vertices', 'vertices')
        self.outputs.new('StringsSocket', 'edges', 'edges')
        self.outputs.new('StringsSocket', 'polygons', 'polygons')
                
    def draw_buttons(self, context, layout):
        layout.prop(self,'inner',text="Clear Inner")
        layout.prop(self,'outer',text="Clear Outer")
        layout.prop(self,'fill',text="Fill cuts")

    def update(self):
        if not ('vertices' in self.outputs and self.outputs['vertices'].links or \
            'edges' in self.outputs and self.outputs['edges'].links and\
            'polygons' in self.outputs and self.outputs['polygons'].links):
            return
            
        if 'vertices' in self.inputs and self.inputs['vertices'].links and \
            'edg_pol' in self.inputs and self.inputs['edg_pol'].links and\
            'cut_matrix' in self.inputs and self.inputs['cut_matrix'].links:
                
            verts_ob = Vector_generate(SvGetSocketAnyType(self,self.inputs['vertices']))
            edg_pols = SvGetSocketAnyType(self,self.inputs['edg_pol'])
            cut_mats_ = SvGetSocketAnyType(self,self.inputs['cut_matrix'])
            cut_mats = Matrix_generate(cut_mats_)
            verts_out = []
            edges_out = []
            polys_out = []
            
            for cut_mat in cut_mats:
                pp = cut_mat.to_translation()
                pno = Vector((0.0, 0.0, 1.0)) * cut_mat.to_3x3().transposed()                
                for obj in zip(verts_ob,edg_pols):
                    res = bisect(obj[0], obj[1], pp, pno, self.outer, self.inner,self.fill)
                    if not res:
                        return
                    verts_out.append(res[0])
                    edges_out.append(res[1])
                    polys_out.append(res[2])
                 
            if 'vertices' in self.outputs and self.outputs['vertices'].links:
                SvSetSocketAnyType(self, 'vertices',verts_out)
            
            if 'edges' in self.outputs and self.outputs['edges'].links:
                SvSetSocketAnyType(self, 'edges',edges_out) 
                
            if 'polygons' in self.outputs and self.outputs['polygons'].links:
                SvSetSocketAnyType(self, 'polygons', polys_out) 
            
     

    def update_socket(self, context):
        self.update()

def register():
    bpy.utils.register_class(SvBisectNode)   
    
def unregister():
    bpy.utils.unregister_class(SvBisectNode)

if __name__ == "__main__":
    register()