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.. _tut_mesh:
Tutorial for Mesh
=================
Create a cube mesh by direct access to base data structures:
.. code-block:: python
import ezdxf
# 8 corner vertices
cube_vertices = [
(0, 0, 0),
(1, 0, 0),
(1, 1, 0),
(0, 1, 0),
(0, 0, 1),
(1, 0, 1),
(1, 1, 1),
(0, 1, 1),
]
# 6 cube faces
cube_faces = [
[0, 1, 2, 3],
[4, 5, 6, 7],
[0, 1, 5, 4],
[1, 2, 6, 5],
[3, 2, 6, 7],
[0, 3, 7, 4]
]
# MESH requires DXF R2000 or later
doc = ezdxf.new("R2000")
msp = doc.modelspace()
mesh = msp.add_mesh()
# do not subdivide cube, 0 is the default value
mesh.dxf.subdivision_levels = 0
with mesh.edit_data() as mesh_data:
mesh_data.vertices = cube_vertices
mesh_data.faces = cube_faces
doc.saveas("cube_mesh_1.dxf")
Create a cube mesh by assembling single faces and the
:meth:`~ezdxf.entities.Mesh.edit_data()` context manager of the
:class:`~ezdxf.entities.Mesh` class, using the helper class
:class:`~ezdxf.entities.MeshData`:
.. code-block:: python
import ezdxf
# 8 corner vertices
p = [
(0, 0, 0),
(1, 0, 0),
(1, 1, 0),
(0, 1, 0),
(0, 0, 1),
(1, 0, 1),
(1, 1, 1),
(0, 1, 1),
]
# MESH requires DXF R2000 or later
doc = ezdxf.new("R2000")
msp = doc.modelspace()
mesh = msp.add_mesh()
with mesh.edit_data() as mesh_data:
mesh_data.add_face([p[0], p[1], p[2], p[3]])
mesh_data.add_face([p[4], p[5], p[6], p[7]])
mesh_data.add_face([p[0], p[1], p[5], p[4]])
mesh_data.add_face([p[1], p[2], p[6], p[5]])
mesh_data.add_face([p[3], p[2], p[6], p[7]])
mesh_data.add_face([p[0], p[3], p[7], p[4]])
# optional call optimize(): minimizes the vertex count
mesh_data.optimize()
doc.saveas("cube_mesh_2.dxf")
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