import gzip
from pathlib import Path
import moderngl
import numpy
import trimesh
from moderngl_window.exceptions import ImproperlyConfigured
from moderngl_window.loaders.base import BaseLoader
from moderngl_window.opengl.vao import VAO
from moderngl_window.scene import Material, Mesh, Node, Scene
[docs]
class Loader(BaseLoader):
kind = "stl"
file_extensions = [
[".stl"],
[".stl", ".gz"],
]
[docs]
def load(self) -> Scene:
"""Loads and stl scene/file
Returns:
Scene: The Scene instance
"""
path = self.find_scene(self.meta.path)
if not path:
raise ImproperlyConfigured("Scene '{}' not found".format(self.meta.path))
file_obj = str(path)
if file_obj.endswith(".gz"):
file_obj = gzip.GzipFile(file_obj)
stl_mesh = trimesh.load(file_obj, file_type="stl")
path = self.meta.resolved_path
if isinstance(path, Path):
resolved = path.as_posix()
else:
resolved = None
scene = Scene(resolved)
scene_mesh = Mesh("mesh")
scene_mesh.material = Material("default")
vao = VAO("mesh", mode=moderngl.TRIANGLES)
vao.buffer(numpy.array(stl_mesh.vertices, dtype="f4"), "3f", ["in_position"])
vao.buffer(numpy.array(stl_mesh.vertex_normals, dtype="f4"), "3f", ["in_normal"])
vao.index_buffer(numpy.array(stl_mesh.faces, dtype="u4"))
scene_mesh.vao = vao
scene_mesh.add_attribute("POSITION", "in_position", 3)
scene_mesh.add_attribute("NORMAL", "in_normal", 3)
scene.meshes.append(scene_mesh)
scene.root_nodes.append(Node(mesh=scene_mesh))
scene.prepare()
return scene