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Camera

Started by cone3d Nov 23, 2001 at 2:13 PM 2 replies 900+ views

Original Post

Nov 23, 2001 at 2:13 PM

Hi all, I''ve got a problem: I''m trying to develop a chase camera system (like in Tomb Raider, for example). Everything is fine, but I can''t put the main character into the right place. I''m using the camera code from NeHe''s lesson 10. I''ve got it nicely rotating around a spot a little bit away from the screen, but I can''t place the player on that spot. This is a really dumb problem, but I''m stuck. Please help me. The code for the camera looks like this:

  
  // calculate translations and rotations.

  xtrans = -xpos-(sin(yrot*piover180) * 0.8f);
  ztrans = -zpos-(cos(yrot*piover180) * 0.8f);
  ytrans = -0.4;
  sceneroty = 360.0f - yrot;
    	
  // Rotate and Translate

  glRotatef(lookupdown, 1.0f, 0, 0);
  glRotatef(sceneroty, 0, 1.0f, 0);
  glTranslatef(xtrans, ytrans, ztrans);

  // draw the scene

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cone3d
http://cone3d.gamedev.net
Multitasking - screwing up several things at once.

TipplerP

Nov 23, 2001 at 3:36 PM

http://www.gamedev.net/reference/articles/article1591.asp

I hope I could help!

Thorsten

cone3d

Nov 24, 2001 at 2:25 PM

thanx, that was what I was looking for.

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cone3d
http://cone3d.gamedev.net
Multitasking - screwing up several things at once.

cone3d

Nov 24, 2001 at 4:41 PM

Ok, now I''ve got the camera nicely rotating around my player on the x and z axises, but I can''t get it rotating around the player on the y axis. On the y axis it just rotates around the 0,0,0 spot.

Here''s what my code looks like:

  
  GLfloat xtrans, ztrans, ytrans;
  GLfloat sceneroty;

  float cameradist=0.8;
  xtrans = -(cameradist * sin((yrot) * piover180) + xpos);
  ytrans = -0.4;
  ztrans = -(cameradist * cos((yrot) * piover180) + zpos);
  sceneroty = 360.0f - yrot;
    	
  // Rotate and Translate

  glRotatef(lookupdown, 1.0f, 0, 0);
  glRotatef(sceneroty, 0, 1.0f, 0);
  glTranslatef(xtrans, ytrans, ztrans);

  // draw the scene


  glPushMatrix();
  glTranslatef(xpos, 0.2f, zpos);
  glRotatef(-sceneroty+90, 0, 1.0f, 0);

  // draw the player


  glPopMatrix();

Any help would be highly apreciated.

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cone3d
http://cone3d.gamedev.net
Multitasking - screwing up several things at once.

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