float yaw = 0;
void DrawScene()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);// Clear The Screen And The Depth Buffer
glLoadIdentity();// load Identity Matrix
yaw+=0.01;
//set camera looking down the -z axis, 6 units away from the center
gluLookAt(WWA[0], WWA[1], WWA[2], sin((float)yaw), WWLA[1], -cos((float)yaw), 0, 1, 0); //Where we are, What we look at, and which way is up
<Lighting and drawing>
Rotating the Camera about itself
Author
Hi I feel bad making a post about camera rotation, but this confuses me and the other thread hasn't helped.
I am trying to make a camera rotate about itself. that is, it is the equivelant of standing in teh middle of the room and spinning on the spot.
I have tried modifying the glLookAt function like so:
I don't know what WWLA is, but I'm assuming WWA is the camera position. If so, you might try this:
gluLookAt( WWA[0], WWA[1], WWA[2], WWA[0] + sin((float)yaw), WWA[1], WWA[2] - cos((float)yaw), 0, 1, 0);
Simple solution - use glRotate*() to rotate the camera.
so:
float yaw = 0;
void DrawScene()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);// Clear The Screen And The Depth Buffer
glLoadIdentity();// load Identity Matrix
yaw+=0.01;
//set camera looking down the -z axis, 6 units away from the center
glRotatef(yaw, 0.0f, 1.0f, 0.0f); //apply yaw rotation.
so:
float yaw = 0;
void DrawScene()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);// Clear The Screen And The Depth Buffer
glLoadIdentity();// load Identity Matrix
yaw+=0.01;
//set camera looking down the -z axis, 6 units away from the center
glRotatef(yaw, 0.0f, 1.0f, 0.0f); //apply yaw rotation.
Quote:Original post by DegraThe above example has a couple of problems, such as that it doesn't take position into account. Here's a modified version:
Simple solution - use glRotate*() to rotate the camera.
so:
float yaw = 0;
void DrawScene()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);// Clear The Screen And The Depth Buffer
glLoadIdentity();// load Identity Matrix
yaw+=0.01;
//set camera looking down the -z axis, 6 units away from the center
glRotatef(yaw, 0.0f, 1.0f, 0.0f); //apply yaw rotation.
glLoadIdentity();yaw+=0.01;glRotatef(-yaw, 0.0f, 1.0f, 0.0f);glTranslatef(-camx, -camy, -camz);
Author
thanks for the replies guys...i changed the LookAt function to:
gluLookAt(WWA[0], WWA[1], WWA[2], WWA[0] - sin((float)pitch), WWA[1] - sin((float)yaw), WWA[2] - cos((float)yaw), 0, 1, 0); //Where we are, What we look at, and which way is up
WWA is a 3 element array (Where We're At). This code kinda works...though it doesn't rotate properly all the time. I think the problem may be 'Gimbal Lock'? Is there a tutorial/explanation on how to solve the problem (if it is indeed this)?
gluLookAt(WWA[0], WWA[1], WWA[2], WWA[0] - sin((float)pitch), WWA[1] - sin((float)yaw), WWA[2] - cos((float)yaw), 0, 1, 0); //Where we are, What we look at, and which way is up
WWA is a 3 element array (Where We're At). This code kinda works...though it doesn't rotate properly all the time. I think the problem may be 'Gimbal Lock'? Is there a tutorial/explanation on how to solve the problem (if it is indeed this)?
Quote:Original post by WinegumsHehe, I think 'WWA' for 'where we're at' gets the prize for most obscure variable name :-) Anyway, to get the effect I'm guessing you're after, you just need to handle the trig a little differently. I could give you an example, but first I'd need to know which axis is considered to be up in your simulation (it's probably either y or z, but it's not clear from looking at your example).
thanks for the replies guys...i changed the LookAt function to:
gluLookAt(WWA[0], WWA[1], WWA[2], WWA[0] - sin((float)pitch), WWA[1] - sin((float)yaw), WWA[2] - cos((float)yaw), 0, 1, 0); //Where we are, What we look at, and which way is up
WWA is a 3 element array (Where We're At). This code kinda works...though it doesn't rotate properly all the time. I think the problem may be 'Gimbal Lock'? Is there a tutorial/explanation on how to solve the problem (if it is indeed this)?
Author
Y is up...i though the "which way is up" bit showed this?
and yeah i guess WWA is quite obscure...i have a habit of naming things for myself... :/
and yeah i guess WWA is quite obscure...i have a habit of naming things for myself... :/
Quote:Original post by WinegumsIt suggests it, but then other things in your code seem to contradict it.
Y is up...i though the "which way is up" bit showed this?
Anyway, here's something else you can try:
float sy = sin(yaw);float cy = cos(yaw);float sp = sin(pitch);float cp = cos(pitch);gluLookAt( WWA[0], WWA[1], WWA[2], WWA[0] + sy * cp, WWA[1] - sp, WWA[2] + cy * cp, 0, 1, 0);
Author
that doesn't seem to do it either, could it be the code i use to find the pitch and yaw?
compare values subtracts one from the other and returns the answer
EDIT: Swapped pitch and yaw and i think it works. thanks for your help :)
EDIT 2:
Ok new problem...trying to move the camera in the direction its facing. I thought to use the values from the look at coordinates to translate to, but that doesn't work. Is there a set method for this?
[Edited by - Winegums on April 5, 2006 6:02:52 PM]
pitch += (CompareValues(MousePos.oldx, MousePos.x)/100);yaw -= (CompareValues(MousePos.oldy,MousePos.y)/100);compare values subtracts one from the other and returns the answer
EDIT: Swapped pitch and yaw and i think it works. thanks for your help :)
EDIT 2:
Ok new problem...trying to move the camera in the direction its facing. I thought to use the values from the look at coordinates to translate to, but that doesn't work. Is there a set method for this?
[Edited by - Winegums on April 5, 2006 6:02:52 PM]
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