Question

Setting gluLookAt() from position and pitch, yaw and roll.

Asked by: AntonKarlsson

Hi. I'm writing a View class that stores the floating-point members: xpos, ypos, zpos, pitch, yaw and roll. And the GLdouble members as passed to gluLookAt().

What I don't really know is how to calculate the eye(X/Y/Z),  center(X/Y/Z) and up(X/Y/Z) members from the location members xpos, ypos, zpos, pitch, yaw and roll. But I suppose the position members is just to pass to gluLookAt as; eye(X/Y/Z) = (x/y/z)pos.
So what I seem need to know is how to setup the center(X/Y/Z) and up(X/Y/Z) members from the pitch, yaw and roll members.

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Asked On
2009-08-19 at 08:52:28ID24665254
Tags

OpenGL gluLookAt position pitch yaw roll

Topic

OpenGL Graphics & Game Programming

Participating Experts
1
Points
125
Comments
5

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Answers

 

by: ikeworkPosted on 2009-08-20 at 05:21:15ID: 25141489

Hi AntonKarlsson,

  eye(X/Y/Z) -> "xpos, ypos, zpos"

  center(X/Y/Z) -> Its the point the camera will look at, you have to calculate it from your input data "xpos, ypos, zpos, pitch, yaw and roll"

  up(X/Y/Z) -> It defines how the camera looks at the center point. The Angle around its local z-axis, towards the scene.

The calculation is quite straight forward. Do you now how to apply "pitch, yaw and roll" in general?


ike

 

by: ikeworkPosted on 2009-08-20 at 05:33:56ID: 25141604

You dont even need to use gluLookAt. You can call OpenGL funcs to setup the camera also. Just put this in the beginning of your render func:

glLoadIdentity();
glRotatef(roll, 0.0f, 0.0f, 1.0f);
glRotatef(pitch, 1.0f, 0.0f, 0.0f);
glRotatef(yaw, 0.0f, 1.0f, 0.0f);
glTranslatef(-xpos, -ypos, -zpos);

 

by: AntonKarlssonPosted on 2009-08-21 at 06:39:51ID: 25151667

But it is said that you use gluLookAt() to come over the euler angles and "gimbal lock".

 

by: ikeworkPosted on 2009-08-21 at 07:04:49ID: 25151891

>> But it is said that you use gluLookAt() to come over the euler angles and "gimbal lock".

Where is that said anyway? And what excactly is said there?

The gimbal lock occurs, if you use Euler-Angles in the first place. Even if you use gluLookAt, you stored the orientation in Euler Angles before.

 

by: AntonKarlssonPosted on 2009-08-27 at 09:23:05ID: 31617683

Thanks.

20120131-EE-VQP-002

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