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Index › Programming Questions & Help › OpenGL and 3D Libraries › Can´t get matrix position
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Can´t get matrix position (Read 2274 times)
ginji
Can´t get matrix position
May 25th, 2010, 4:19am  
Hello!

I modity a original code that I found on openprocessing.org, but now I've some problems. I want to get de x and y position from the matrix to, after that, intersect the spaceship with the cubes. But I can´t get anything.

If anyone understand what is the resolution, i'll be very grateful!

Code:

PMatrix3D matrix;

float p = 10; //"size" SPACESHIP
float zs = 0.1; //accelaration SPACESHIP
float endZS; //accelaration SPACESHIP
float easing = 0.05; //accelaration SPACESHIP
Cubo[] cubos;//CUBES

void setup()
{
  size(800,600,P3D);
  noStroke();
  cursor(CROSS);
  
  //call CUBES
  cubos = new Cubo[1000];
  
  for (int i = 0; i < cubos.length; i++ ) {
    cubos[i] = new Cubo(random(-3000,3000),random(-3000,3000),random(0,50));
  }
  
  matrix = new PMatrix3D();
  // this is a hack for 1.0.9
  ((PGraphics3D)g).cameraNear = -8;
}

void draw()
{
  background(230);
  //LIGHT
  directionalLight(126, 126, 126, 0, 0, -1);
  ambientLight(150, 150, 150);
  
  //accelaration SPACESHIP
  endZS += 0.001;
  zs = zs + (endZS - zs)*easing;

  // scene location -- note the z is the camera offset
  translate(width/2,height*3/5.95,(height/2)/tan(PI/6));

  // move a step (-1 in Z = into the scene)
  matrix.translate(0,0,-zs);
  // rotate according to the current mouse position
  matrix.rotateY( 0.0001 * (width/2-mouseX) );

  PMatrix3D inv = new PMatrix3D(matrix);
  inv.invert();
  applyMatrix(inv);
    
  pushMatrix();
  applyMatrix(matrix);
  
  translate(0, 20, -40);
  spaceship();
  popMatrix();
  
  //CUBES
  translate(0,-50,0);
  for (int i = 0; i < cubos.length; i++ ) {
    cubos[i].display();
  }
}

void keyPressed()
{
  matrix = new PMatrix3D();
  println(matrix.get());
}

void spaceship(){
  beginShape(TRIANGLES);
  fill(92,201,206);
  vertex(-p, 0,0);
  vertex(p, 0, 0);
  vertex(0, 0, p-30);
  fill(92,201,206);
  vertex(0, -p+5, 0);
  vertex(p, 0, 0);
  vertex(0, 0, p-30);
  fill(92,201,206);
  vertex(0, -p+5, 0);
  vertex(-p, 0, 0);
  vertex(0, 0, p-30);
  fill(92,201,206);
  vertex(0, -p+5, 0);
  vertex(-p, 0, 0);
  vertex(p, 0, 0);
  endShape(CLOSE);
}


Code:

class Cubo {
  
  float x,z;
  float s;     //size CUBES
  
  Cubo(float tempX, float tempZ, float tempS) {
    x = tempX;
    z = tempZ;
    s = tempS;
  }
  
  void display() {
    fill(242,118,56);
    
    pushMatrix();
    translate(x,65-(s/2),z);
    box(10+s);
    popMatrix();
  }
}
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ginji
Re: Can´t get matrix position
Reply #1 - May 30th, 2010, 4:21pm  
Finally I find a way to get de position of the matrix with this:

Code:
  PMatrix3D mp = (PMatrix3D)getMatrix();
  mx = mp.m03;
  my = mp.m13;
  mz = mp.m23;


Now I have this:

Code:
PMatrix3D matrix;

float p = 10; //"size" SPACESHIP
float zs = 0.1; //accelaration SPACESHIP
float endZS; //accelaration SPACESHIP
float easing = 0.05; //accelaration SPACESHIP
Cubo[] cubos;//CUBES

float mx;
float my;
float mz;

void setup()
{
  size(800,600,P3D);
  noStroke();
  cursor(CROSS);
  
  //call CUBES
  cubos = new Cubo[1000];
  
  for (int i = 0; i < cubos.length; i++ ) {
    cubos[i] = new Cubo(random(-3000,3000),random(-3000,3000),random(0,50));
  }
  
  matrix = new PMatrix3D();
  // this is a hack for 1.0.9
  ((PGraphics3D)g).cameraNear = -8;
}

void draw()
{
  background(230);
  //LIGHT
  directionalLight(126, 126, 126, 0, 0, -1);
  ambientLight(150, 150, 150);
  
  //accelaration SPACESHIP
  endZS += 0.001;
  zs = zs + (endZS - zs)*easing;

  // scene location -- note the z is the camera offset
  translate(width/2,height*0.7,(height/2)/tan(PI/6));

  // move a step (-1 in Z = into the scene)
  matrix.translate(0,0,-zs);
  // rotate according to the current mouse position
  matrix.rotateY( 0.0001 * (width/2-mouseX) );

  PMatrix3D inv = new PMatrix3D(matrix);
  inv.invert();
  applyMatrix(inv);
    
  pushMatrix();
  applyMatrix(matrix);
  
  translate(0, 20, -260);
  spaceship();
  popMatrix();
  
  //CUBES
  for (int i = 0; i < cubos.length; i++ ) {
    cubos[i].display();
  }
  
  PMatrix3D mp = (PMatrix3D)getMatrix();
  mx = mp.m03;
  my = mp.m13;
  mz = mp.m23;
  
  println("mx: " + mx);
  println("my: " + my);
  println("mz: " + mz);
  
}

void keyPressed()
{
  matrix = new PMatrix3D();
}

void spaceship(){
  beginShape(TRIANGLES);
  fill(92,201,206);
  vertex(-p, 0,0);
  vertex(p, 0, 0);
  vertex(0, 0, p-30);
  fill(92,201,206);
  vertex(0, -p+5, 0);
  vertex(p, 0, 0);
  vertex(0, 0, p-30);
  fill(92,201,206);
  vertex(0, -p+5, 0);
  vertex(-p, 0, 0);
  vertex(0, 0, p-30);
  fill(92,201,206);
  vertex(0, -p+5, 0);
  vertex(-p, 0, 0);
  vertex(p, 0, 0);
  endShape(CLOSE);
}


But now, I can't use this values to intersect the spaceship (matrix) with the cubes.I'm trying with this code in cube's class but the intersection isn't correctly:

Code:

  if (x >= mx-300 && x <= mx+300 && z >= mz-300 && z <= mz+300){
    f = color (24,240,10);
  } else {
    f = color (242,118,56);
  }


Bye!
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