https://github.com/rdeits/scratchholograms

A set of tools to make abrasion (scratch) holography easier to do by hand
https://github.com/rdeits/scratchholograms

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A set of tools to make abrasion (scratch) holography easier to do by hand

• Host: GitHub
• URL: https://github.com/rdeits/scratchholograms
• Owner: rdeits
• License: mit
• Created: 2011-09-29T23:19:03.000Z (about 13 years ago)
• Default Branch: master
• Last Pushed: 2014-11-25T05:18:38.000Z (almost 10 years ago)
• Last Synced: 2023-03-11T19:18:36.632Z (over 1 year ago)
• Language: Ruby
• Homepage:
• Size: 52 MB
• Stars: 19
• Watchers: 3
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: Readme.markdown
  • License: License

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README

        
About:

=============

This is a program designed to make it easier to create scratch holograms (see

http://www.eskimo.com/~billb/amateur/holo1.html). It allows the user to create a

3D model in Google SketchUp, and then convert that model into a pattern to

generate a hologram of the model. I've blogged about it here: 

http://blog.robindeits.com/2011/09/26/scratch-holograms/

http://blog.robindeits.com/2012/02/20/more-scratch-holograms/

Requirements:

=============

python 2.6 or 2.7 with Matplotlib and Numpy

Google SketchUp (tested on version 8)

Installation:

=============

Currently, this is only tested on OS X 10.6 and 10.7. It can probably be made to

work on other systems relatively easily, but I haven't done so yet. 

Install SDXF from http://www.kellbot.com/sdxf-python-library-for-dxf/

Open up solid_pattern.rb: change the value of SCRIPTS_DIR to point to the

directory containing draw_pattern.py, and change PYTHON_PATH to point to your

python executable. Next, copy (or symlink) solid_pattern.rb to your Google

Sketchup Plugins folder (/Library/Application\ Support/Google\ SketchUp\

8/SketchUp/plugins/ on OS X). 

Usage:

======

Create a new model in SketchUp (or open up one of the samples provided with

this distribution), and save it somewhere convenient. Then click Plugins ->

Make Solid Scratch Pattern... and save the *.pattern file in whatever folder

you want the pattern files to appear in. Shortly thereafter, the printable

pattern file (.pdf), the drawing file for CNC milling (.dxf), and simulated

views at three viewing angles (_view_+5.pdf, etc.) will appear in the same

folder. 

A few notes on usage:

The X and Y coordinates of the generated hologram correspond to the Y and Z

axes, respectively, of the SketchUp model, and the depth of the hologram

corresponds to the X axis of the model. A SketchUp model which is entirely in

the X < 0 region will form a hologram below the surface of the material, while a

model in the X > 0 region will form a hologram above the surface.