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need help trying to make a record come out straight instead of a spiral

[1 Reply]
- 14-Mar-2013 10:48 AM
- Forum: Contributed Library Questions
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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