Rotating camera on X axis

[n00bc0de]

After rotating the camera on the X axis by more than 90 degrees, the camera seems to change orientation so its not upside down. Is there a way to disable this.

Here is the code (I just added this to example 18 to test camera rotation:

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irr::core::vector3df pt = Camera[0]->getAbsolutePosition();
pt += irr::core::vector3df(0,0,1);
Camera[0]->setTarget(pt);

irr::core::vector3df ct = Camera[0]->getTarget();
ct.rotateYZBy(cr, Camera[0]->getAbsolutePosition());

Camera[0]->setTarget(ct);
cr++;

if(cr >= 360)
   cr = 0;

[Noiecity]

I remember using fmod to work out the camera rotations based on angles in irrlicht

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fmod(+5.1, +3.0) = 2.1
fmod(-5.1, +3.0) = -2.1
fmod(+5.1, -3.0) = 2.1
fmod(-5.1, -3.0) = -2.1

https://en.cppreference.com/w/cpp/numeric/math/fmod

I also used core::clamp to limit the degrees, making it 360 degrees.
https://irrlicht.sourceforge.io/docu/na ... 81d3316969
Something like that, although I don't remember well:

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core::clamp(fmod(RotationAppliedVariable, totalDegrees), minLimit, maxLimit);

I also remember that it worked better using core::abs_ instead of fmod

https://irrlicht.sourceforge.io/docu/na ... 1ea7551c91

Edit: This solved it as the rotation could go from 400 degrees to 1 degree, instead of 400 to 401, it did not happen in these degrees but that was the problem lmao

[CuteAlien]

It's because the up vector always looks to 0,1,0. Which works in most cases so you don't have to care about it, but not if you try to do this. If you need full 360° rotation you have to know all 3 axes of the camera, like:

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irr::core::vector3df pt = Camera[0]->getAbsolutePosition();
irr::core::vector3df view(0,0,1);
irr::core::vector3df right(1,0,0);
view.rotateYZBy(cr);
pt += view;
Camera[0]->setTarget(pt);
irr::core::vector3df up = view.crossProduct(right);
Camera[0]->setUpVector(up);
cr += 0.1f;

Note that "right" vector is fixed for this case - but for this to work in general you'll have to know the correct one always.
Also I rewrote your rotation a bit, yours likely also works, but it's a bit complicated.

[n00bc0de]

Thanks CuteAlien. That works perfectly.