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In this project, I will show you how to make modify a CNC machine to make the kind of scratches needed to make complex scratch holograms automagically! Even if you aren't interested in making scratch holograms, this project will show you how you can add additional tools onto your CNC machine.
Scratch is a free programming language and online community where you can create your own interactive stories, games, and animations.
Have you ever noticed ghostly blobs floating above your black car hood on a sunny day? These blobs are scratch holograms! They appear when the sun is reflecting off circular scratches from activities like washing, polishing, or drying your car.
- Overview
- Requirements:
- Installation:
- Usage:
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/
python 2.6 or 2.7 with Matplotlib and Numpy Google SketchUp (tested on version 8)
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).
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.
The scratch-hologram technique might be very useful in reducing the amount of data required for computer-generated holography. The size independence characteristic suggests that billboard-sized holograms wouldn't be impossible to build.
Jan 7, 2009 · This video shows how to craft 3 dimensional holograms using scratched arcs on a reflective surface. Using a compass, a picture, and Plexiglas, you can create...
- 4 min
- 150.8K
- Fort Worth Museum of Science and History
People also ask
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What are scratch holograms & why do they float?
How do I make a solid scratch pattern in SketchUp?
Use this app to convert Basic 3D models (with very few faces/triangles) from .STL to .SVG image files that can be used in your CNC/Laser CAM software (e.g. EstlCam, Fusion 360, LightBurn, etc...) to generate .GCODE toolpaths executable by your machine.