How to export vertices' locations in a .dat file?

Question

Is there anyone know,

(a) how to do an ico sphere of radius=0.5;

(b) how to set the verticles' number and faces' number in an ico sphere;

(c) how to export all vertices' locations in the following format to a .dat file?

! each row has all three vertices' location for a face. x1 y1 z1 x2 y2 z2 x3 y3 z3

....

Answer 1

For questions a and b, you can find those options in the left-side menu immediately after adding in the icosphere primitive.

For outputing the vertices of each face into a .dat file, I recommend using this script:

import bpy

obj = bpy.context.scene.objects.active
data = obj.data

output_data = []

for face in data.polygons:
    loc_list = []
    precision = 3
    for index in face.vertices:
        vert = data.vertices[index]
        loc_list.append(" ".join([
            str(round(vert.co.x, precision)),
            str(round(vert.co.y, precision)),
            str(round(vert.co.z, precision))
            ])
        )

    output_data.append(" ".join(loc_list))

filepath = "/home/doakey/Desktop/output.dat"
with open(filepath, 'w') as f:
    f.write("\n".join(output_data))

Just copy the python script into Blender's text editor, select the icosphere, and run the script. Be sure to change the output path of your .dat file in the script.

Answer 2

Animation Nodes

You can use Animation Nodes to get such information and write it to a file. First, loop over the polygon indices and get the vertices locations at those indices, then get the individual numbers of the vectors, convert them to text and join them using as space as a separator:

Then join the output using a linear break as a separator:

Then you can write the text to a text block using the Text Block Writer Node:

Save the text and you are done.

Python

This script will write the data to the text block test.dat:

import bpy

mesh = bpy.data.objects['Icosphere'].data
data = ""

for poly in mesh.polygons:
    for vert in poly.vertices:
        for c in mesh.vertices[vert].co:
            data += str(c) + " "
    data += "\n"
    
if not "test.dat" in bpy.data.texts:
    bpy.data.texts.new("test.dat")

bpy.data.texts['test.dat'].write(data)