Blender, echo points, edges, faces

14. 11. 2021

Goal: Make a lowres object for meshspin.js.

What to export from Blender? It appears that meshspin is operating on vertices and edges (no faces?).

import bpy

obdata = bpy.context.object.data

print('Vertices:')
for v in obdata.vertices:
    print('{}. {} {} {}'.format(v.index, v.co.x, v.co.y, v.co.z))

print('Edges:')
for e in obdata.edges:
    print('{}. {} {}'.format(e.index, e.vertices[0], e.vertices[1]))

print('Faces:')
for f in obdata.polygons:
    print('{}. '.format(f.index), end='')
    for v in f.vertices:
        print('{} '.format(v), end='')
    print() # for newline

In Python_console, the problem is I can’t figure out how to log the console output and its history is lacking…

Edit, this might be the answer:

 Preferences/System/Console Scrollback Lines

Question for you. What’s better than 256 console lines? Answer for you. 32768 console lines.

Meshspin example data:

var cube = {
    nodes: [
    {x:1, y: 1, z: -1},
    {x:1, y: -1, z: -1},
    {x:-1, y: -1, z: -1},
    {x:-1, y: 1, z: -1},
    {x:1, y: 1, z: 1},
    {x:1, y: -1, z: 1},
    {x:-1, y: -1, z: 1},
    {x:-1, y: 1, z: 1},
    ],
    edges: [[0,1], [0,3], [0,4], [0,2], [1,3], [1,5], [1,2], [2,3], [2,6], [3,7], [4,5], [4,7], [5,6], [6,7]],
};
var mesh = new MeshSpin();
mesh.figure(cube);
mesh.setup('wrapper');
mesh.run();

Reformating to get close to desired output:

import bpy
obdata = bpy.context.object.data

print('Vertices:')
for v in obdata.vertices:
    print('{}{}{}{}{}{}{}'.format('{x:', v.co.x, ',y:', v.co.y, ',z:', v.co.z, '},'))

print('Edges:')
for e in obdata.edges:
    print('{}{}{}{}{}'.format('[', e.vertices[0], ',', e.vertices[1], '],'), end =" ")

returns:

# points
{x:-0.8110758662223816,y:0.4698903560638428,z:2.2209718227386475},
{x:-0.544812798500061,y:-0.7124779224395752,z:1.0221654176712036},
{x:-0.0627538338303566,y:2.0761661529541016,z:1.7460660934448242},
{x:-0.08819231390953064,y:3.478560447692871,z:2.216146230697632},
{x:-0.2751067578792572,y:4.331906318664551,z:2.8761749267578125},
...
# edges    
[46,0], [78,1], [20,0], [2,14], [2,124], [2,56], [3,81], [48,125], [57,3], [126,49], [5,4], [50,61], [84,61], [60,5], [61,49], [67,1], [1,85], [51,15], [86,51], [51,85], [7,6], [9,8], [88,8], [87,8], [9,7], [1,10], [10,90], [91,90], [10,91]
...

Putting it all together.

Note that fake meshspin shading wont work,
since this object is not concave enough.

blender