mantis/primitives_containers.py

from .node_container_common import *
from .base_definitions import MantisNode

def TellClasses():
    return [
             # Primitives
             CirclePrimitive,
            ]

#*#-------------------------------#++#-------------------------------#*#
# P R I M I T I V E S
#*#-------------------------------#++#-------------------------------#*#



class CirclePrimitive(MantisNode):
    '''A node representing a Circle Primitive mesh'''

    def __init__(self, signature, base_tree):
        self.base_tree=base_tree
        self.signature = signature
        self.inputs = {
          "Name"               : NodeSocket(is_input = True, name = "Name", node = self),
          "Radius"             : NodeSocket(is_input = True, name = "Radius", node = self),
          "Number of Points"   : NodeSocket(is_input = True, name = "Number of Points", node = self),
        }
        self.outputs = {
          "Circle" : NodeSocket(is_input = False, name = "Circle", node=self),
        }
        self.parameters = {
          "Name":None,
          "Radius":None,
          "Number of Points":None, 
          "Circle":None, 
        }
        self.node_type = "UTILITY"
        self.hierarchy_connections = []
        self.connections = []
        self.hierarchy_dependencies = []
        self.dependencies = []
        self.prepared = True
        self.executed = False



    def bGetObject(self):
        from bpy import data
        # first try Curve, then try Mesh
        bObject = data.curves.get(self.evaluate_input("Name"))
        if not bObject:
            bObject = data.meshes.get(self.evaluate_input("Name"))
        return bObject
        
    def bExecute(self, bContext = None,):
        # Get the datablock
        data = self.bGetObject()
        import bpy
        if not data:
            data = bpy.data.meshes.new( self.evaluate_input("Name") )
        # make the circle
        import bmesh; bm = bmesh.new()
        bmesh.ops.create_circle( # lazy but easy
            bm,
            cap_ends=False,
            radius=max(self.evaluate_input("Radius"), 0.0001),
            segments=min( max( self.evaluate_input("Number of Points"), 3), 1024),
            )
        # this is rotated 90 degrees, we need Y-up instead of Z-up
        from mathutils import Matrix
        from math import pi
        for v in bm.verts:
            v.co = Matrix.Rotation(pi/2, 4, 'X') @ v.co
        # done with this, push it to the data and free the bmesh.
        bm.to_mesh(data); bm.free()
        self.executed = True