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Warlander
03-23-2013, 06:23 AM
Like in topic. I want to make 3d camera for my tool, but I have problem with camera on y (up-down) axis. x and z axis camera works well, but when I look up and down camera is becoming less and less sensitive while trying to move camera straight up or straight down, up to infinity. I don't have an idea how can I fix this.

Here is my camera class (Java):


import org.lwjgl.input.Mouse;
import org.lwjgl.opengl.Display;
import org.lwjgl.util.glu.GLU;

public class Camera {

private int pastMousex;
private int pastMousey;

private float fraction = 0.1f;
private float rotate = 0.01f;

private float posx=0;
private float posy=0;
private float posz=0;

private float dirx=0;
private float diry=0;
private float dirz=-1;

private float anglex=0;
private float angley=0;

public void setSpeed(float speed, float rotation) {
fraction=speed;
rotate=rotation;
}

public void update(KeyboardInput keyboard, MouseInput mouse) {
if (mouse.pressed.left) {
Mouse.setGrabbed(true);
Mouse.setCursorPosition(Display.getWidth()/2, Display.getHeight()/2);
pastMousex = Display.getWidth()/2;
pastMousey = Display.getHeight()/2;
}
else if (mouse.hold.left) {
float diffx = mouse.x - pastMousex;
float diffy = mouse.y - pastMousey;

angley += diffx*rotate;
dirx = (float)Math.sin(angley);
dirz = (float)-Math.cos(angley);

anglex += diffy*rotate;
diry = anglex;

if (angley>Math.PI*2) {
angley-=Math.PI*2;
}
else if (angley<0) {
angley+=Math.PI*2;
}

Mouse.setCursorPosition(Display.getWidth()/2, Display.getHeight()/2);
pastMousex = Display.getWidth()/2;
pastMousey = Display.getHeight()/2;
}
else if (mouse.released.left) {
mouse.setMouseGrabbed(false);
}
if (keyboard.hold.d) {
posx += (float)Math.sin(angley+Math.PI/2)*fraction;
posz += (float)-Math.cos(angley+Math.PI/2)*fraction;
}
if (keyboard.hold.a) {
posx += (float)Math.sin(angley-Math.PI/2)*fraction;
posz += (float)-Math.cos(angley-Math.PI/2)*fraction;
}
if (keyboard.hold.w) {
posx += dirx * fraction;
posz += dirz * fraction;
posy += diry * fraction;
}
if (keyboard.hold.s) {
posx -= dirx * fraction;
posz -= dirz * fraction;
posy -= diry * fraction;
}
}

public void set() {
GLU.gluLookAt(posx, posy, posz, posx+dirx, posy+diry, posz+dirz, 0, 1, 0);
}

}

Aleksandar
03-23-2013, 07:37 AM
On the first glance the behavior is quite legitimate, since you are not changing "Up" vector.
Take a look at gluLookAt() function spec. and the meaning of the last three parameters.