View Full Version : Beginner trying to use transformations.

01-08-2001, 06:41 PM
I am trying to make a maze that someone can move through. The problem is that when I rotate the 'camera' in the ModelView matrix and then try to move forward the 'player' stills moves straight forward. Meaning that the 'player' continues along the z axis with no respect as to the angle of the view. I decided to use some trigonometry to find the amount of x and z that the 'player' moves each time using sin and cos. But when I put these equations into my program I get unpredictable results. Sometimes I go up, others I go straight along the z axis. It even messes up when I try to go forwards without even turning. It usually goes off to the left. I don't have my code with me but basically I:
- do rotations
- do translations
- draw world

Should I do it in a different order or something? Am I using the wrong trig functions? Thanks for any replies. My friend and I are just starting with OpenGL. When I have me code I will post it. Thanks again.

01-09-2001, 10:13 AM
dir = players direction from 0-360 degrees
pos = players position
x-z is the ground plane , y is up

pos.x += sin( dir* degrees to radians)
pos.z += cos( dir* degrees to radians)

draw player

hopefully that should work

01-09-2001, 09:04 PM
I just worked out a method for moving around quake3/half-life style if you want to look at it its here http://members.home.net/gradyfield/project2.zip (http://members.home.net/gradyfield/) on my slow web space that the @home cheapskates give out to their customers. questions you can email to gradyfield@home.com

[This message has been edited by grady (edited 01-09-2001).]

01-10-2001, 04:36 AM
Thanks for all the replies.