Rotation with a slider

Questions & Answers
1

I am trying to set up a slider (that starts at 0.5) that can be used to rotate around the x axis (-180 to + 180). I am not fully understanding how rotation works, however.

Here is my code

//percent is the value of the slider
float angle = 180;
float rotation = ((angle * 2) * percent) - angle; 

transform.localRotation = Quaternion.Euler(rotation, transform.localEulerAngles.y, transform.localEulerAngles.z);

Since I will be adding sliders for the y and z rotation as well, I don’t want them to be affected by the x slider. The code above doesn’t work. It produces a seemingly random angle while sliding the slider.

EDIT:
Doing this code below seems to output strange results.

Vector3 vec = new Vector3(rotation,0,0);

vec = Vector3.Scale(transform.localEulerAngles, new Vector3(0,1,1)) + vec;

transform.localEulerAngles = vec;

Debug.Log(rotation + " " + transform.localEulerAngles);

The log then outputs (going from -180)

-180 (0, 180, 180)
-168 (348,0,0)
-156 (336,180,180)
-144 (324,0,0)
-132 (312, 180,180)
-120 (300,0,0)
-108 (288,180,180)
-84 (276,0,0)
… (the rest are actually correct)

What is happening? Why is Y and Z rotation getting set to 180? Why is the X inaccurate? It appears anything not in the range of -90 to 90 screws up. Why???

2

set your slider’s min value to -180, max to 180, and just stuff it in, something like this (not tested)

OnGUI()
 rotx = GUI.Slider (xRect, rotx, -180f, 180f);
 var temp = transform.localEulerAngles;
 temp.x = rotx;
 transform.localEulerAngles = temp;
3

Ok, so I think I understand what was going on.

When things are rotated over 90, Unity acts really strange when handling how it displays it. The rotation worked, but it seemed like it was spazzing out because after you assign the Euler angles, they may get changed for whatever reason, but the rotation should still look the same. So simply doing

float angle = 180;

float rotation = ((angle * 2) * percent) - angle;

x = rotation;

transform.localEulerAngles = new Vector3(x,y,z);

Worked. Where x, y, and z are the angles calculated by the slider. Just don’t read the Euler rotations or you would think something is broken. Unity has the most complicated rotation I have ever used in a game engine, and I have used several…