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Index › Programming Questions & Help › Programs › 3D Navigation in Game!
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3D Navigation in Game! (Read 634 times)
SuperDuffMan
3D Navigation in Game!
Nov 2nd, 2006, 12:19am  
Hi All,

Im starting a wolf3D type game ;)

BUT im trying to get my guy to move around.

I want to move the guy forward then rotate around his center to face a new direction and then to move forward that way.

please see my code...

//=====================================================-

int boxSize;
float _LR,_FB,_round;

void setup()
{
 size(500, 500, P3D);
 frameRate(30);

 _LR = 0.0;
 _FB = 0.0;
 _round = 0.0;  
 boxSize = 20;
}

void draw()
{background(200);

 camera(280.29, 197.79, 48.80, 256.60, 247.29, 0.0, 0.0, 1.0, 0.0);
 translate(width/2,height/2,0);

 fill(0,125,255);
 box(2,2,2);//Blue
     
 pushMatrix();
                               //rotateY(_round); //Rotate aroune the center of the world But move from the guy
     translate(_LR, 0, _FB);
                                 rotateY(_round); //Rotate aroune the guy But move from the center of the world
     fill(50);
     box(2,2,3);
     pushMatrix();
         translate(0,0,3);
         fill(255);
         box(2,2,3);
    popMatrix();
     
 popMatrix();

 walls();
}

void keyPressed()
{
 if (keyCode == LEFT)
 {  _LR +=0.3;  }
 
 else if (keyCode == RIGHT)
 {  _LR -=0.3;  }
 
 if (keyCode == DOWN)
 {  _FB -=0.3;  }
 
 else if (keyCode == UP)
 {  _FB +=0.3; }
 
 if(key == '1')
 {  _round +=0.1;  }
 
 else if(key == '2')
 {  _round -=0.1;  }
}
void walls()
{
 dispalyWalls();
 pushMatrix();
   translate(boxSize,0,0+boxSize);
   rotateY(-1.6);
   dispalyWalls();
 popMatrix();
}
void dispalyWalls()
{
 pushMatrix();
     fill(255,0,0);
    translate(0,0,-(boxSize/2));
     box(boxSize,boxSize,2);
   popMatrix();
   
   pushMatrix();
     fill(0,255,0);
     translate(-(boxSize/2),0,0);
     rotateY(1.6);
     box(boxSize,boxSize,2);
   popMatrix();
   
    pushMatrix();
     fill(0,0,255);
     translate((boxSize/2),0,0);
     rotateY(1.6);
     box(boxSize,boxSize,2);
   popMatrix();
}

//=================================================-

Thanks for any help.
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movax
Re: 3D Navigation in Game!
Reply #1 - Nov 2nd, 2006, 8:46pm  
Ahh wolfenstein...  The way they made that game was really darn clever.  A technique called Raycasting.  Do a search to see how John Carmack designed it 'back in the day'.  But nowadays we can get the same results easier in 3D.

Since a wolfenstein style game is essentially a 2D
game with a 3D display, you only need to keep track of 3 things:

playerX, playerY, heading

Heading will be an angle measured in radians, where 2*PI radians=360 degrees.  X,Y are your position on the map.

Then when you press the "forward" button:

playerX+=cos(heading)*stepsize;//try various stepsize values
playerY+=sin(heading)*stepsize;

When you press the "back" button:

playerX-=cos(heading)*stepsize;
playerY-=sin(heading)*stepsize;

Rotate left: heading+=.1;
Rotate right: heading-=.1;

Try drawing everything as a 2D top-down (third person) view first.  Draw a little arrow to represent your player.  That will help you get it rolling because you'll be able to see exactly whats happening.

good luck
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ddf
Re: 3D Navigation in Game!
Reply #2 - Nov 3rd, 2006, 12:08am  
You might find it helpful to use the OCD camera library and simply treat the camera you create as the player's eyes. Seems like it'd be a bit less of a headache.
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SuperDuffMan
Re: 3D Navigation in Game!
Reply #3 - Nov 3rd, 2006, 12:27am  
Huge thanks movax & ddf
I had looked into that camera But movax has the right thing i was looking for.

O.. movax, I had to switch around the +/- & cos/sin !

I’m hoping to now mount the cam on the front of the guy/box and do my collision detection on the box, that should keep the cam in the level & all that jazz ^_^

//====================================== New Code + Strafing

int boxSize;
float playerX,playerZ,heading,stepsize;

void setup()
{
 size(500, 500, P3D);
 frameRate(30);

 playerX = 0.0;
 playerZ = 0.0;
 heading = 1.6;  
 boxSize = 20;
 stepsize = 0.2;
}

void draw()
{background(200);

 camera(250.0, 197.79, -23.80, 250.0, 250.0, 0.0, 0.0, 1.0, 0.0);
 translate(width/2,height/2,0);
 fill(0,125,255);
 box(2,2,2);//Blue

 pushMatrix();
    translate(playerX, 0, playerZ);
    rotateY(heading-1.6);
    fill(50);
    box(2,2,3);
  pushMatrix();
    translate(0,0,2);
    fill(255);
    box(1,1,2);
  popMatrix();
popMatrix();

 walls();
}

void keyPressed()
{
 if (LEFT == keyCode || 81 == keyCode) // 81 = 'q';
 {  heading += .1;  }
 
 else if (RIGHT == keyCode || 69 == keyCode) // 69 = 'e';
 {  heading -= .1;   }
 
 if (DOWN == keyCode || 83 == keyCode) // 83 = 'S';
 {
    playerX += cos(heading)*stepsize;
    playerZ -= sin(heading)*stepsize;
 }
 
 else if (UP == keyCode || 87 == keyCode) // 87 = 'w';
 {
    playerX -= cos(heading)*stepsize;
    playerZ += sin(heading)*stepsize;
 }
 
 //sidestepping ~ Strafing
 if(65 == keyCode) // 65 = 'a';
 {
    playerZ += cos(heading)*stepsize;
    playerX += sin(heading)*stepsize;
 }
 else if(68 == keyCode) // 68 = 'd';
 {
    playerZ -= cos(heading)*stepsize;
    playerX -= sin(heading)*stepsize;
 }
 keyCode = '?'; //Reset the keyCode

}
void walls()
{
  //...ADD CODE FROM ABOVE
}
void dispalyWalls()
{
  //...ADD CODE FROM ABOVE
}
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