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"""
Mesh Data
+++++++++
The mesh data is accessed in object mode and intended for compact storage,
for more flexible mesh editing from python see :mod:`bmesh`.
Blender stores 4 main arrays to define mesh geometry.
- :class:`Mesh.vertices` (3 points in space)
- :class:`Mesh.edges` (reference 2 vertices)
- :class:`Mesh.loops` (reference a single vertex and edge)
- :class:`Mesh.polygons`: (reference a range of loops)
Each polygon references a slice in the loop array, this way, polygons do not store vertices or corner data such as UVs directly,
only a reference to loops that the polygon uses.
:class:`Mesh.loops`, :class:`Mesh.uv_layers` :class:`Mesh.vertex_colors` are all aligned so the same polygon loop
indices can be used to find the UVs and vertex colors as with as the vertices.
To compare mesh API options see: :ref:`NGons and Tessellation Faces <info_gotcha_mesh_faces>`
This example script prints the vertices and UVs for each polygon, assumes the active object is a mesh with UVs.
"""
import bpy
me = bpy.context.object.data
uv_layer = me.uv_layers.active.data
for poly in me.polygons:
print("Polygon index: {:d}, length: {:d}".format(poly.index, poly.loop_total))
# range is used here to show how the polygons reference loops,
# for convenience 'poly.loop_indices' can be used instead.
for loop_index in range(poly.loop_start, poly.loop_start + poly.loop_total):
print(" Vertex: {:d}".format(me.loops[loop_index].vertex_index))
print(" UV: {!r}".format(uv_layer[loop_index].uv))
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