Created
June 16, 2020 10:16
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Create objects in Blender using Metaclasses
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| import bpy | |
| import numpy as np | |
| from numpy import (sin, cos, pi) | |
| def remove_from(data, name): | |
| if name in data: | |
| data.remove(data[name]) | |
| class BObjectMeta(type): | |
| def __new__(cls, name, bases, dct): | |
| for attr in ["vertices", "edges", "faces"]: | |
| if attr not in dct: | |
| dct[attr] = [] | |
| x = super().__new__(cls, name, bases, dct) | |
| if name == "BObject": | |
| return x | |
| x.name = name | |
| x.mesh_name = f"{name} mesh" | |
| remove_from(bpy.data.meshes, x.mesh_name) | |
| remove_from(bpy.data.objects, x.name) | |
| x.mesh = bpy.data.meshes.new(x.mesh_name) | |
| x.object = bpy.data.objects.new(x.name, x.mesh) | |
| x.mesh.from_pydata(x.vertices, x.edges, x.faces) | |
| bpy.data.collections[0].objects.link(x.object) | |
| return x | |
| class BObject(metaclass=BObjectMeta): | |
| pass | |
| class Triangle(BObject): | |
| vertices = [(0, 0, 0), (0, 2, 0), (0, 1, 2)] | |
| faces = [(0, 1, 2)] | |
| class Disc(BObject): | |
| vertices = [(cos(t), sin(t), 0) for t in np.linspace(0, 2*pi, 20)] | |
| faces = [range(20)] |
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