Title: Use Libreoffice Calc to make 3D models
       Author: Solène
       Date: 27 April 2021
       Tags: fun
       Description: 
       
       # Introduction
       
       Today I will share with you a simple python script turning a 2D picture
       defined by numbers and colors in a spreadsheet into a 3D model in
       OpenSCAD.
       
 (HTM) Project webpage
       
       # How to install
       
       Short instructions how to install sheetstruder, I will send some
       documentation upstream. You need git and python and later you will need
       openscad and a spreadsheet tool.
       
       ```shell instructions
       git clone https://git.hackers.town/seachaint/sheetstruder.git
       cd sheetstruder
       python3 -m venv sandbox
       . sandbox/bin/activate
       python3 -m pip install -r requirements.txt
       ```
       
       You will need to be in this shell (you need at least the activate
       command) to make it work.
       
       # How to use
       
       Open a spreadsheet tool that is able to export in format xlsx, type a
       number to create a solid object of this width (1 = 1 pixel, 2 = 3
       pixels because it's mirrored) and put a background color in your cell. 
       Save your file as xlsx.
       
       Run "python3 ./sheetstruder.py yourfile.xlsx > file.scad" and open the
       file in OpenSCAD, enjoy!
       
       # Examples
       
       I made a simple house with grass around, an antenna, cheminey with
       smoke, a door and window in it.
       
 (IMG) House in Libreoffice Calc
 (IMG) House rendered in OpenSCAD from the sheetstruder export
       
       # More resources
       
 (HTM) OpenSCAD website