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  3D Camera math is off  (Read 3307 times)
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Offline opiop65

JGO Kernel


Medals: 156
Projects: 7
Exp: 3 years


JumpButton Studios


« Posted 2013-10-12 12:56:03 »

I've been trying to get back into 3D for a few days now, and I decided to make the camera. The problem is that when I rotate around the z axis, the rotation is actually applied to my movement in such a way that the y position of the camera rises a little if the z rotation is not 0. I'll show you my code:
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if (Keyboard.isKeyDown(Keyboard.KEY_A)) {
         float yrotrad;
         yrotrad = (yrot / 180 * 3.141592654f);
         xpos -= (float) (Math.cos(yrotrad)) * strafeSpeed;
         zpos -= (float) (Math.sin(yrotrad)) * strafeSpeed;
      }

      if (Keyboard.isKeyDown(Keyboard.KEY_D)) {
         float yrotrad;
         yrotrad = (yrot / 180 * 3.141592654f);
         xpos += (float) (Math.cos(yrotrad)) * strafeSpeed;
         zpos += (float) (Math.sin(yrotrad)) * strafeSpeed;
      }

      if (Keyboard.isKeyDown(Keyboard.KEY_W)) {
         float xrotrad, yrotrad;
         yrotrad = (yrot / 180 * 3.141592654f);
         xrotrad = (xrot / 180 * 3.141592654f);
         xpos += (float) (Math.sin(yrotrad) / walkSpeed);
         zpos -= ((float) (Math.cos(yrotrad)) / walkSpeed);
         ypos -= ((float) (Math.sin(xrotrad)) / walkSpeed);
      }

      if (Keyboard.isKeyDown(Keyboard.KEY_S)) {
         float xrotrad, yrotrad;
         yrotrad = (yrot / 180 * 3.141592654f);
         xrotrad = (xrot / 180 * 3.141592654f);
         xpos -= (float) (Math.sin(yrotrad) / walkSpeed);
         zpos += ((float) (Math.cos(yrotrad)) / walkSpeed);
         ypos += ((float) (Math.sin(xrotrad)) / walkSpeed);
      }

And my mouse code:
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public void updateMouse() {
      mouseX = Mouse.getX();
      mouseY = 720 - Mouse.getY();

      mouseDX = Mouse.getDX();
      mouseDY = -Mouse.getDY();
     
      Mouse.setGrabbed(true);
     
      xrot += (((float) mouseDY) * .090);
      yrot += (((float) mouseDX) * .090);
     
      if(xrot > 90){
         xrot = 90;
      }
     
      if(xrot < -90){
         xrot = -90;
      }
   }

Obviously this is a trig question, but I'm not the best at trig (taking it next semester), so I don't know how to fix it!

Offline opiop65

JGO Kernel


Medals: 156
Projects: 7
Exp: 3 years


JumpButton Studios


« Reply #1 - Posted 2013-10-12 13:03:15 »

Nevermind, I'm an idiot I fixed it!

Offline ra4king

JGO Kernel


Medals: 352
Projects: 3
Exp: 5 years


I'm the King!


« Reply #2 - Posted 2013-10-12 19:15:39 »

What exactly was the problem? Best to post the solution for anyone in the future Smiley

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Offline opiop65

JGO Kernel


Medals: 156
Projects: 7
Exp: 3 years


JumpButton Studios


« Reply #3 - Posted 2013-10-13 00:23:28 »

Ah yes, I was inverting my z a i rotation so that when I aimed the camera down and pressed the forward key, I would actually move upwards.

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