add_mesh_extra_objects/add_mesh_star.py

   1 # GPL Original by Fourmadmen
   2
   3 import bpy
   4 from mathutils import (
   5         Vector,
   6         Quaternion,
   7         )
   8 from math import pi
   9 from bpy.props import (
  10         IntProperty,
  11         FloatProperty,
  12         )
  13
  14
  15 # Create a new mesh (object) from verts/edges/faces.
  16 # verts/edges/faces ... List of vertices/edges/faces for the
  17 #                       new mesh (as used in from_pydata)
  18 # name ... Name of the new mesh (& object)
  19
  20 def create_mesh_object(context, verts, edges, faces, name):
  21
  22     # Create new mesh
  23     mesh = bpy.data.meshes.new(name)
  24
  25     # Make a mesh from a list of verts/edges/faces.
  26     mesh.from_pydata(verts, edges, faces)
  27
  28     # Update mesh geometry after adding stuff.
  29     mesh.update()
  30
  31     from bpy_extras import object_utils
  32     return object_utils.object_data_add(context, mesh, operator=None)
  33
  34
  35 # A very simple "bridge" tool.
  36
  37 def createFaces(vertIdx1, vertIdx2, closed=False, flipped=False):
  38     faces = []
  39
  40     if not vertIdx1 or not vertIdx2:
  41         return None
  42
  43     if len(vertIdx1) < 2 and len(vertIdx2) < 2:
  44         return None
  45
  46     fan = False
  47     if (len(vertIdx1) != len(vertIdx2)):
  48         if (len(vertIdx1) == 1 and len(vertIdx2) > 1):
  49             fan = True
  50         else:
  51             return None
  52
  53     total = len(vertIdx2)
  54
  55     if closed:
  56         # Bridge the start with the end.
  57         if flipped:
  58             face = [
  59                 vertIdx1[0],
  60                 vertIdx2[0],
  61                 vertIdx2[total - 1]]
  62             if not fan:
  63                 face.append(vertIdx1[total - 1])
  64             faces.append(face)
  65
  66         else:
  67             face = [vertIdx2[0], vertIdx1[0]]
  68             if not fan:
  69                 face.append(vertIdx1[total - 1])
  70             face.append(vertIdx2[total - 1])
  71             faces.append(face)
  72
  73     # Bridge the rest of the faces.
  74     for num in range(total - 1):
  75         if flipped:
  76             if fan:
  77                 face = [vertIdx2[num], vertIdx1[0], vertIdx2[num + 1]]
  78             else:
  79                 face = [vertIdx2[num], vertIdx1[num],
  80                         vertIdx1[num + 1], vertIdx2[num + 1]]
  81             faces.append(face)
  82         else:
  83             if fan:
  84                 face = [vertIdx1[0], vertIdx2[num], vertIdx2[num + 1]]
  85             else:
  86                 face = [vertIdx1[num], vertIdx2[num],
  87                         vertIdx2[num + 1], vertIdx1[num + 1]]
  88             faces.append(face)
  89
  90     return faces
  91
  92
  93 # @todo Clean up vertex&face creation process a bit.
  94
  95 def add_star(points, outer_radius, inner_radius, height):
  96     PI_2 = pi * 2
  97     z_axis = (0, 0, 1)
  98
  99     verts = []
 100     faces = []
 101
 102     segments = points * 2
 103
 104     half_height = height / 2.0
 105
 106     vert_idx_top = len(verts)
 107     verts.append(Vector((0.0, 0.0, half_height)))
 108
 109     vert_idx_bottom = len(verts)
 110     verts.append(Vector((0.0, 0.0, -half_height)))
 111
 112     edgeloop_top = []
 113     edgeloop_bottom = []
 114
 115     for index in range(segments):
 116         quat = Quaternion(z_axis, (index / segments) * PI_2)
 117
 118         if index % 2:
 119             # Uneven
 120             radius = outer_radius
 121         else:
 122             # Even
 123             radius = inner_radius
 124
 125         edgeloop_top.append(len(verts))
 126         vec = quat @ Vector((radius, 0, half_height))
 127         verts.append(vec)
 128
 129         edgeloop_bottom.append(len(verts))
 130         vec = quat @ Vector((radius, 0, -half_height))
 131         verts.append(vec)
 132
 133     faces_top = createFaces([vert_idx_top], edgeloop_top, closed=True)
 134     faces_outside = createFaces(edgeloop_top, edgeloop_bottom, closed=True)
 135     faces_bottom = createFaces([vert_idx_bottom], edgeloop_bottom,
 136         flipped=True, closed=True)
 137
 138     faces.extend(faces_top)
 139     faces.extend(faces_outside)
 140     faces.extend(faces_bottom)
 141
 142     return verts, faces
 143
 144
 145 class AddStar(bpy.types.Operator):
 146     bl_idname = "mesh.primitive_star_add"
 147     bl_label = "Simple Star"
 148     bl_description = "Construct a star mesh"
 149     bl_options = {'REGISTER', 'UNDO', 'PRESET'}
 150
 151     points: IntProperty(
 152         name="Points",
 153         description="Number of points for the star",
 154         min=2,
 155         max=256,
 156         default=5
 157         )
 158     outer_radius: FloatProperty(
 159         name="Outer Radius",
 160         description="Outer radius of the star",
 161         min=0.01,
 162         max=9999.0,
 163         default=1.0
 164         )
 165     innter_radius: FloatProperty(
 166         name="Inner Radius",
 167         description="Inner radius of the star",
 168         min=0.01,
 169         max=9999.0,
 170         default=0.5
 171         )
 172     height: FloatProperty(name="Height",
 173         description="Height of the star",
 174         min=0.01,
 175         max=9999.0,
 176         default=0.5
 177         )
 178
 179     def execute(self, context):
 180
 181         verts, faces = add_star(
 182             self.points,
 183             self.outer_radius,
 184             self.innter_radius,
 185             self.height
 186             )
 187
 188         obj = create_mesh_object(context, verts, [], faces, "Star")
 189
 190         return {'FINISHED'}