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Weird purplish layer on the drawing

[6 Replies]
- 30-Oct-2010 11:29 AM
- Forum: Programming Questions
hello helpers!

I need to fill the mesh faces according to their height and their angle. But there is a strange purple color instead that affects the color mode... (not a problem with the camera position) Any idea ? I think it might be the definition of the 90 degree angle

Here is the code :

import anar.*;

import processing.opengl.*;

PVector[] faceNorm;

PVector[] baseVec;

String[] txtNdx;

String[] txtVtx;

Pt[] meshVtx;

Pt[] nPt;

Pt[] basePt;

float[] ang;

Face testFace = new Face();

Face[] meshFaces;

void setup() {

  size (600,600,OPENGL);

  Anar.init(this);

  Anar.drawAxis();

colorMode(HSB);

  txtVtx = loadStrings("MeshVertexP2.txt");

  txtNdx = loadStrings("MeshIndexP2.txt");

  meshVtx = new Pt[txtVtx.length];



  meshFaces=new Face[txtNdx.length];

ReadTxtData_INDEXEDMESH(txtVtx, txtNdx, meshVtx, meshFaces);

  faceNorm = new PVector[txtNdx.length];

   baseVec = new PVector[txtNdx.length];

   nPt = new Pt[txtNdx.length];

   basePt = new Pt[txtNdx.length];

   ang = new float[txtNdx.length];



   for(int i=0; i<txtNdx.length; i++) {

   nPt[i] = meshFaces[i].normal();

   faceNorm[i] = new PVector( nPt[i].x()-meshFaces[i].center().x(), nPt[i].y()-meshFaces[i].center().y(), nPt[i].z()-meshFaces[i].center().z() );

   baseVec[i] = new PVector( faceNorm[i].x, faceNorm[i].y,0) ;



  }

}

void draw() {

  background(255);

camera(2000.0,2000.0,4000.0,2000.0,2000.0,0.0,0.0,1.0,0.0) ;

  for(int i=0; i<meshFaces.length; i++) {



   float ang;

   if (baseVec[i].x==0 && baseVec[i].y ==0){



   ang=radians(90);

   } else {

   float dotprod = faceNorm[i].dot(baseVec[i]);

   ang = acos(dotprod/(baseVec[i].mag()*faceNorm[i].mag())) ;

   }

   if ((meshFaces[i].center().z()> 20) && (meshFaces[i].center().z()<= 30)) {

   color fColor = color(240,((90-degrees(ang))*20), 360);

   meshFaces[i].fill(red(fColor), green(fColor), blue(fColor));

   }



   if ((meshFaces[i].center().z()> 30) && (meshFaces[i].center().z()<= 40)) {

   color fColor = color(210,((90-degrees(ang))*20), 360);

   meshFaces[i].fill(red(fColor), green(fColor), blue(fColor));

   }



   if ((meshFaces[i].center().z()> 40) && (meshFaces[i].center().z()<= 50)) {

   color fColor = color(180,((90-degrees(ang))*20), 360);

   meshFaces[i].fill(red(fColor), green(fColor), blue(fColor));

   }



   if ((meshFaces[i].center().z()> 50) && (meshFaces[i].center().z()<= 60)) {

   color fColor = color(150,((90-degrees(ang))*20), 360);

   meshFaces[i].fill(red(fColor), green(fColor), blue(fColor));

   }



   if ((meshFaces[i].center().z()> 60) && (meshFaces[i].center().z()<= 70)) {

   color fColor = color(120,((90-degrees(ang))*20), 360);

   meshFaces[i].fill(red(fColor), green(fColor), blue(fColor));

   }



   if ((meshFaces[i].center().z()> 70) && (meshFaces[i].center().z()<= 80)) {

   color fColor = color(90,((90-degrees(ang))*20), 360);

   meshFaces[i].fill(red(fColor), green(fColor), blue(fColor));

   }



   if ((meshFaces[i].center().z()> 80) && (meshFaces[i].center().z()<= 100)) {

   color fColor = color(60,((90-degrees(ang))*20), 360);

   meshFaces[i].fill(red(fColor), green(fColor), blue(fColor));

   }



   meshFaces[i].draw();

   noStroke();

  }

}

void keyPressed() {

  if (key =='s') {

   saveFrame("image"+".jpg");

  }

}

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