need help trying to make a record come out straight instead of a spiral
in
Contributed Library Questions
•
7 months ago
Hi
i am currently working on a project based on Amanda Ghassaei 3d printed record project.
http://www.instructables.com/id/3D-Printed-Record/
i want to be able to produce a record groove in a straight line instead of a spiral, with the idea being that i can use a 3d modelling tool to bend it in to any shape i want.
however im new to processing and can not work out what makes it spiral :-(
this is the code ( i have altered it so it just makes a groove and not a whole record)
import processing.opengl.*;
import unlekker.util.*;
import unlekker.modelbuilder.*;
import ec.util.*;
String filename = "sample.txt";
UVertexList recordPerimeterUpper,recordPerimeterLower,recordHoleUpper,recordHoleLower;//storage for perimeter and center hole of record
UVertexList lastEdge;//storage for conecting one groove to the next
UGeometry geo;//storage for stl geometry
//parameters
float samplingRate = 44100;//(44.1khz audio initially)
float rpm = 33.3;//rev per min
float secPerMin = 60;//seconds per minute
float rateDivisor = 40;//how much we are downsampling by
float theta;//angle variable
float thetaIter = (samplingRate*secPerMin)/(rateDivisor*rpm);//how many values of theta per cycle
float radius;//variable to calculate radius of grooves
float diameter = 11.8;//diameter of record in inches
float innerHole = 0.286;//diameter of center hole in inches
float innerRad = 2.35;//radius of innermost groove in inches
float outerRad = 5.75;//radius of outermost groove in inches
//record parameters
float recordHeight = 0.04;//height of record in inches
int recordBottom = 0;//height of bottom of record
//variable parameters
float amplitude = 24;//amplitude of signal (in 16 micron steps)
float bevel = 0.5;//bevelled groove edge
float grooveWidth = 2;//in 600dpi pixels
float depth = 6;//measured in 16 microns steps, depth of tops of wave in groove from uppermost surface of record
float incrNum = TWO_PI/thetaIter;//calculcate angular incrementation amount
int grooveNum = 0;//variable for keeping track of how long this will take
int totalSampleNum;
void setup(){
geo = new UGeometry();//place to store geometery of verticies
setUpVariables();//convert units, initialize etc
setUpRecordShape();//draw basic shape of record
drawGrooves(processAudioData());//draw in grooves
//change extension of file name
String name = filename;
int dotPos = filename.lastIndexOf(".");
if (dotPos > 0)
name = filename.substring(0, dotPos);
geo.writeSTL(this, name + ".stl");//write stl file from geomtery
exit();
}
float[] processAudioData(){
//get data out of txt file
String rawData[] = loadStrings(filename);
String rawDataString = rawData[0];
float audioData[] = float(split(rawDataString,','));//separated by commas
//normalize audio data to given bitdepth
//first find max val
float maxval = 0;
for(int i=0;i<audioData.length;i++){
if (abs(audioData[i])>maxval){
maxval = abs(audioData[i]);
}
}
//normalize amplitude to max val
for(int i=0;i<audioData.length;i++){
audioData[i]*=amplitude/maxval;
}
return audioData;
}
void setUpVariables(){
//convert everything to inches
float micronsPerInch = 25400;//scalingfactor
float dpi = 600;//objet printer prints at 600 dpi
byte micronsPerLayer = 16;//microns per vertical print layer
amplitude = amplitude*micronsPerLayer/micronsPerInch;
depth = depth*micronsPerLayer/micronsPerInch;
grooveWidth /= dpi;
}
void setUpRecordShape(){
//set up storage
recordPerimeterUpper = new UVertexList();
recordPerimeterLower = new UVertexList();
recordHoleUpper = new UVertexList();
recordHoleLower = new UVertexList();
//get verticies
for(theta=0;theta<TWO_PI;theta+=incrNum){
//outer edge of record
float perimeterX = diameter/2+diameter/2*cos(theta);
float perimeterY = diameter/2+diameter/2*sin(theta);
recordPerimeterUpper.add(perimeterX,perimeterY,recordHeight);
recordPerimeterLower.add(perimeterX,perimeterY,recordBottom);
//center hole
float centerHoleX = diameter/2+innerHole/2*cos(theta);
float centerHoleY = diameter/2+innerHole/2*sin(theta);
recordHoleUpper.add(centerHoleX,centerHoleY,recordHeight);
recordHoleLower.add(centerHoleX,centerHoleY,recordBottom);
}
//close vertex lists (closed loops)
recordPerimeterUpper.close();
recordPerimeterLower.close();
recordHoleUpper.close();
recordHoleLower.close();
//connect verticies
geo.quadStrip(recordHoleUpper,recordHoleLower);
geo.quadStrip(recordHoleLower,recordPerimeterLower);
geo.quadStrip(recordPerimeterLower,recordPerimeterUpper);
//to start, outer edge of record is the last egde we need to connect to with the outmost groove
lastEdge = new UVertexList();
lastEdge.add(recordPerimeterUpper);
println("record drawn, starting grooves");
grooveNum = 0;//variable for keeping track of how much longer this will take
}
void drawGrooves(float[] audioData){
UVertexList grooveOuterUpper,grooveOuterLower,grooveInnerUpper,grooveInnerLower;//groove verticies
UVertexList stop1,stop2;//storage for very beginning and end of sprial groove
//set up storage
grooveOuterUpper = new UVertexList();
grooveOuterLower = new UVertexList();
grooveInnerUpper = new UVertexList();
grooveInnerLower = new UVertexList();
stop1 = new UVertexList();
stop2 = new UVertexList();
//DRAW GROOVES
radius = outerRad;//outermost radius (at 5.75") to start
float radIncr = (grooveWidth+2*bevel*amplitude)/thetaIter;//calculate radial incrementation amount
int samplenum = 0;
int totalgroovenum = int(audioData.length/(rateDivisor*thetaIter));
//first draw starting cap
theta = 0;
float sineTheta = sin(theta);
float cosineTheta = cos(theta);
//calculate height of groove
float grooveHeight = recordHeight-depth-amplitude+audioData[int(rateDivisor*samplenum)];
stop1.add((diameter/2+(radius+amplitude*bevel)*cosineTheta),(diameter/2+(radius+amplitude*bevel)*sineTheta),recordHeight);//outerupper
stop2.add((diameter/2+radius*cosineTheta),(diameter/2+radius*sineTheta),grooveHeight);//outerlower
stop2.add((diameter/2+(radius-grooveWidth)*cosineTheta),(diameter/2+(radius-grooveWidth)*sineTheta),grooveHeight);//innerlower
stop1.add((diameter/2+(radius-grooveWidth-amplitude*bevel)*cosineTheta),(diameter/2+(radius-grooveWidth-amplitude*bevel)*sineTheta),recordHeight);//innerupper
//draw triangles
geo.quadStrip(stop1,stop2);
//then spiral groove
while (rateDivisor*samplenum<(audioData.length-rateDivisor*thetaIter+1)){//while we still have audio to write and we have not reached the innermost groove //radius>innerRad &&
//clear lists
grooveOuterUpper.reset();
grooveOuterLower.reset();
grooveInnerUpper.reset();
grooveInnerLower.reset();
for(theta=0;theta<TWO_PI;theta+=incrNum){//for theta between 0 and 2pi
sineTheta = sin(theta);
cosineTheta = cos(theta);
//calculate height of groove
grooveHeight = recordHeight-depth-amplitude+audioData[int(rateDivisor*samplenum)];
samplenum++;//increment sample num
if (grooveNum==0){
grooveOuterUpper.add((diameter/2+(radius+amplitude*bevel)*cosineTheta),(diameter/2+(radius+amplitude*bevel)*sineTheta),recordHeight);
}
grooveOuterLower.add((diameter/2+radius*cosineTheta),(diameter/2+radius*sineTheta),grooveHeight);
grooveInnerLower.add((diameter/2+(radius-grooveWidth)*cosineTheta),(diameter/2+(radius-grooveWidth)*sineTheta),grooveHeight);
grooveInnerUpper.add((diameter/2+(radius-grooveWidth-amplitude*bevel)*cosineTheta),(diameter/2+(radius-grooveWidth-amplitude*bevel)*sineTheta),recordHeight);
radius -= radIncr;
}
//add last value to grooves to complete one full rev
theta = 0;
sineTheta = sin(theta);
cosineTheta = cos(theta);
//calculate height of groove
grooveHeight = recordHeight-depth-amplitude+audioData[int(rateDivisor*samplenum)];
if (grooveNum==0){
grooveOuterUpper.add(grooveInnerUpper.first());//grooveOuterUpper.add((diameter/2+(radius+amplitude*bevel)*cosineTheta),(diameter/2+(radius+amplitude*bevel)*sineTheta),recordHeight);
}
grooveOuterLower.add((diameter/2+radius*cosineTheta),(diameter/2+radius*sineTheta),grooveHeight);
grooveInnerLower.add((diameter/2+(radius-grooveWidth)*cosineTheta),(diameter/2+(radius-grooveWidth)*sineTheta),grooveHeight);
grooveInnerUpper.add((diameter/2+(radius-grooveWidth-amplitude*bevel)*cosineTheta),(diameter/2+(radius-grooveWidth-amplitude*bevel)*sineTheta),recordHeight);
//connect verticies
if (grooveNum==0){//if joining a roove to the edge of the record
geo.quadStrip(lastEdge,grooveOuterUpper);
geo.quadStrip(grooveOuterUpper,grooveOuterLower);
}
else{//if joining a groove to another groove
geo.quadStrip(lastEdge,grooveOuterLower);
}
geo.quadStrip(grooveOuterLower,grooveInnerLower);
geo.quadStrip(grooveInnerLower,grooveInnerUpper);
//set new last edge
lastEdge.reset();//clear old data
lastEdge.add(grooveInnerUpper);
//complete beginning cap if necessary
if (grooveNum==0){
//clear stop2
stop2.reset();
stop2.add(diameter/2+diameter/2*cosineTheta,diameter/2+diameter/2*sineTheta,recordHeight);//outer perimeter[0]
stop2.add((diameter/2+(radius+amplitude*bevel)*cosineTheta),(diameter/2+(radius+amplitude*bevel)*sineTheta),recordHeight);//outer groove edge [2pi]
//draw triangles
geo.quadStrip(stop1,stop2);
}
//tell me how much longer
grooveNum++;
print(grooveNum);
print(" of ");
print(totalgroovenum);
println(" grooves drawn");
}
//draw end cap of spiral groove
stop1.reset();
stop2.reset();
stop1.add((diameter/2+(radius+amplitude*bevel)*cosineTheta),(diameter/2+(radius+amplitude*bevel)*sineTheta),recordHeight);//outeruppter
stop2.add((diameter/2+radius*cosineTheta),(diameter/2+radius*sineTheta),grooveHeight);//outerlower
stop2.add((diameter/2+(radius-grooveWidth)*cosineTheta),(diameter/2+(radius-grooveWidth)*sineTheta),grooveHeight);//innerlower
stop1.add((diameter/2+(radius-grooveWidth-amplitude*bevel)*cosineTheta),(diameter/2+(radius-grooveWidth-amplitude*bevel)*sineTheta),recordHeight);//innerupper
//draw triangles
geo.quadStrip(stop1,stop2);
stop2.reset();
stop2.add(lastEdge.last());//innerupper[0]
stop2.add(diameter/2+innerHole/2*cosineTheta,diameter/2+innerHole/2*sineTheta,recordHeight);//innerhole[0]
//draw triangles
geo.quadStrip(stop1,stop2);
geo.quadStrip(lastEdge,recordHoleUpper);//close remaining space between last groove and center hole
}
if anyone could tell me how to alter it to make it produce straight grooves or where about it makes the groove spiral it would be greatly appreciated :-)
thanks
charliesomeone
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