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Rotating problem (Read 425 times)
marcpsp
Rotating problem
Jul 23rd, 2008, 11:16am  
Hi,i am doing a FPS game with processing,but i have a problem when i rotate the axis,because i dont rotate like an human.If anybody test my code, he understand this.
Code:
Variables:
float heading;
float jugador_x;
float jugador_z;
//float walk;
float piover180 = 0.0174532925f;
float rotacion_y;
The draw:
void draw() {
 background(0);
 float xtrans = -jugador_x;
 float ztrans = -jugador_z;
 float ytrans = -walkbias-0.25;
 float sceneroty = radians(360 - rotacion_y);


 rotateY(sceneroty);
 
 translate(xtrans,ytrans,ztrans);
}
The movements:
 if (keyCode == UP) {
 
   jugador_x -= (float)sin(heading*piover180)* 5;
   jugador_z -= (float)cos(heading*piover180)* 5;
   
 }
 if (keyCode == DOWN) {

   jugador_x += (float)sin(heading*piover180)* 5;
   jugador_z += (float)cos(heading*piover180)* 5;
   
 }
 if (keyCode == RIGHT) {

   heading -= 1.0;
   rotacion_y = heading;


 }
 if (keyCode == LEFT) {
 
   heading += 1.0;
   rotacion_y = heading;


 }
}
(i dont put the another part of the code because its only drawing a room.)
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JohnG
Re: Rotating problem
Reply #1 - Jul 23rd, 2008, 11:37am  
you need to do your transformations in the following order for it to work as you'd expect:

Code:
translate(...);
rotateY(...);
rotateX(...);


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marcpsp
Re: Rotating problem
Reply #2 - Jul 23rd, 2008, 11:49am  
Quote:
you need to do your transformations in the following order for it to work as you'd expect:

Code:
translate(...);
rotateY(...);
rotateX(...);



Thanks for your answer,but continues doing the same;
this is my code,but simplified:

Code:

import processing.opengl.*;

float heading;
float xpos;
float zpos;
float yrot;
float lookupdown = 0.0f;

void setup() {
  size (800,600, OPENGL);
}

void draw() {
  background(0); ;
  float xtrans = -xpos;
  float ztrans = -zpos;
  float sceneroty = radians(360 - yrot);

 

  translate(xtrans, 0, ztrans);

  rotateY(sceneroty);
     rotateX(lookupdown);
  pushMatrix();
    translate(width/2-200, height/2-200);
    rect(0,0,400,400);
  popMatrix();
}

void keyPressed() {
  if (keyCode == UP) {
    xpos -= (float)sin(radians(heading));
    zpos -= (float)cos(radians(heading));
  }
  if (keyCode == DOWN) {
    xpos += (float)sin(radians(heading));
    zpos += (float)cos(radians(heading));
  }
  if (keyCode == RIGHT) {
    heading -= 1.0f;
    yrot = heading;
  }
  if (keyCode == LEFT) {
    heading += 1.0f;
    yrot = heading;
  }
}
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V
Re: Rotating problem
Reply #3 - Jul 23rd, 2008, 1:44pm  
here's a simple example. im using vector/matrix math

www.pixelnerve.com/downloads/processing/simpleMoveRotateCamera.zip

enjoy
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Victor Martins | www.pixelnerve.com/v
WWW  
marcpsp
Re: Rotating problem
Reply #4 - Jul 23rd, 2008, 6:42pm  
thanks for your sample. I use it for my FPS game.
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