virtual chalkboard in processing
Posted by Nikolaus Gradwohl
today i coded a little processing sketch that allows to make chalk like drawings
click here to give it a try
How To Make a 3D-Paper Model from a Heightfield in Processing
Posted by Nikolaus Gradwohl
I just wrote a little processing sketch that takes a height field like this
calculates a pdf containing something like this
which can be cut out and sticked together to a 3d model like this
awsome model of the solar system from 1756
Posted by Nikolaus Gradwohl
on my last trip to the Natural History Museum Vienna i found a totaly awsome model of the solar system from 1756
Car Part Monster
Posted by Nikolaus Gradwohl
a friend of mine found another monster in his garage while he was working on his car
New Toy - aeh i mean Tool - i got an osciloscope
Posted by Nikolaus Gradwohl
This weekend i finished soldering my Digital Oscilloscope Kit from jyetech.com
reallly, really cool new toy - aeh tool :-)
New pencil drawings
Posted by Nikolaus Gradwohl
i just added 5 new pencil drawings to my drawings gallery
Robo-Necklace
Posted by Nikolaus Gradwohl
I designed and printed a robo necklace
if you want to print one yourself, download the stl file or fetch the openscad and the dxf file. then stick on some moving eyes
it's licenced under a creative commons share alike licence
calling webservices from mootools, jquery or dojo
Posted by Nikolaus Gradwohl
I wrote a small webservie using java6 and jax-ws. Then i wrote clients for the webservice using some some popular javascript frameworks. I used mootools, jquery and dojo for writing the clients.
I tried to use the same simple form for all the three clients to make them comparable. I also used no libraries besides the core framework classes.
click here to download the sourcecode of the clients and the java-service
Read more...line detection with hough-transform
Posted by Nikolaus Gradwohl
I wrote a small processing sketch to work out how linedetection using hough-transform works.
click here to see it in action and get the sourcecode. the code is not optimised for speed but for my understanding :-) so don't complain if it doesn't work on live-video.
the algorithm takes a image that has run through an edge detection algorithm and turned into a black/white image and find where things like edges or circles are by converting the pixels from imagespace to a parameterspace where such detection is much easyer.
for each pixel that is set in the source image a set of parameters that satisfy the formular r = x * cos(roh) + y * sin(roh) is calculated and r and roh are plotted as the parameterspace image
every line in the input image results in a bunch of lines in the parameterspace that have a common intersection point.
in my example i use a input image like this
calculate how it looks in parameter space
and then reconstruct where the lines are
Printed Processing sketch
Posted by Nikolaus Gradwohl
I just printed the first stl file that i generated using a processing sketch.
I used the unlekkerlib to export a stl file from a sketch that generates simple 3d spiral, used blender to add a socket and printed it on my makerbot. Skeinforge complained about some invalid triangles, but beside that it worked surprisingly well.
This is what it looks like in blender
and this is what the makerbot made of it
and this is the processing-sketch i used to generated the spiral
import unlekker.data.*;
void setup() {
size(300,300,P3D);
noLoop();
}
void draw() {
translate(width/2,height/2);
background(0);
fill(255);
lights();
noStroke();
//stroke(255);
beginRaw("unlekker.data.STL","guru.stl");
beginShape(QUAD_STRIP);
for( int i =0; i < 100; i++ ) {
for(int a=0; a < 36; a++) {
float r = 10 - map(i,0,100,0,10);
vertex( r * sin( radians( a * 10 )) + sin(radians(i*10)) * 10,
-i*1,
r * cos(radians(a*10)) + cos(radians(i*10)) * 10);
int j = i+1;
vertex( r * sin( radians( a * 10 )) + sin(radians(j*10)) * 10,
-j*1,
r * cos(radians(a*10)) + cos(radians(j*10)) * 10);
}
}
endShape();
endRaw();
}
