Reset camera view

Core Library Questions

butterbr0t

in Core Library Questions • 1 year ago

Hey guys,
I have my little openGL sketch where I can rotate around a 3d model. I am not using PeasyCam, cause I think it has some weird movement in it and I also had problems to position it correcty, so I use translate and rotate to move in the 3d scene.
However, I'd like to reset my camera to the intial view when hitting the spacebar. How would I do this (not the keyboard thing, just the camera)?
Cheers

Replies(2)

jbum

Re: Reset camera view

1 year ago

You are probably passing some values to rotate which change the rotation of your camera. Store the initial values in variables (perhaps the initial values are zero?).

Then, when you hit the spacebar, reset the rotation to the original values.

Easier to explain if you post your little OpenGL sketch.

butterbr0t

Re: Reset camera view

1 year ago

Ouch, yea. Dont know why I didnt try that on my own, guess I've been sitting in front of this too long today ^^. Thanks mate, resetting the values worked fine.

For anyone with similar issues: I was using some values

rotx = 0;
roty = 0;
offX = 0;
offY = 0;
theScale = 1;

to move and rotate my 3d scene inside the draw function like this

// offsets
translate(offX, offY);
rotateX(rotx);
rotateY(roty);
scale(theScale);

and I changed them with some mouse events like this

public void mouseWheel(int delta) {
float rate = 0.25f;
if (delta == -1) {
theScale += rate;
} else {
theScale -= rate;
}
}
public void mouseDragged() {
if (mouseButton == LEFT) {
float rate = 0.015f;
rotx += (pmouseY - mouseY) * rate;
roty += (mouseX - pmouseX) * rate;
}
if (mouseButton == RIGHT) {
float rate = 0.015f;
theScale -= (pmouseY - mouseY) * rate;
}
if (mouseButton == CENTER) {
float rate = 1.0f;
offY -= (pmouseY - mouseY) * rate;
offX += (mouseX - pmouseX) * rate;
}
}

So to reset the camera view, I simply set all my values back to zero/one. I guess this is not a very elegant way for 3d navigation, but so far it seems to work ;)
Cheers

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