Object rotation constraint problems with Mathf.Clamp ()
I am working on a game that rotates an object on the z axis. I need to limit the total rotation to 80 degrees. I tried the following code but it doesn't work. minAngle = -40.0f and maxAngle = 40.0f
Vector3 pos = transform.position;
pos.z = Mathf.Clamp(pos.z, minAngle, maxAngle);
transform.position = pos;
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2 answers
The code you posted clamps the z position. You want to use transform.rotation
void ClampRotation(float minAngle, float maxAngle, float clampAroundAngle = 0)
{
//clampAroundAngle is the angle you want the clamp to originate from
//For example a value of 90, with a min=-45 and max=45, will let the angle go 45 degrees away from 90
//Adjust to make 0 be right side up
clampAroundAngle += 180;
//Get the angle of the z axis and rotate it up side down
float z = transform.rotation.eulerAngles.z - clampAroundAngle;
z = WrapAngle(z);
//Move range to [-180, 180]
z -= 180;
//Clamp to desired range
z = Mathf.Clamp(z, minAngle, maxAngle);
//Move range back to [0, 360]
z += 180;
//Set the angle back to the transform and rotate it back to right side up
transform.rotation = Quaternion.Euler(transform.rotation.eulerAngles.x, transform.rotation.eulerAngles.y, z + clampAroundAngle);
}
//Make sure angle is within 0,360 range
float WrapAngle(float angle)
{
//If its negative rotate until its positive
while (angle < 0)
angle += 360;
//If its to positive rotate until within range
return Mathf.Repeat(angle, 360);
}
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Here's a static version of Imapler's nice solution, which, instead of changing the angle itself, returns a chamfered angle, so it can be used with any axis.
public static float ClampAngle(
float currentValue,
float minAngle,
float maxAngle,
float clampAroundAngle = 0
) {
return Mathf.Clamp(
WrapAngle(currentValue - (clampAroundAngle + 180)) - 180,
minAngle,
maxAngle
) + 360 + clampAroundAngle;
}
public static float WrapAngle(float angle)
{
while (angle < 0) {
angle += 360;
}
return Mathf.Repeat(angle, 360);
}
Or, if you don't expect to use the WrapAngle method, here's the all-in-one version:
public static float ClampAngle(
float currentValue,
float minAngle,
float maxAngle,
float clampAroundAngle = 0
) {
float angle = currentValue - (clampAroundAngle + 180);
while (angle < 0) {
angle += 360;
}
angle = Mathf.Repeat(angle, 360);
return Mathf.Clamp(
angle - 180,
minAngle,
maxAngle
) + 360 + clampAroundAngle;
}
So now you can do:
transform.localEulerAngles.x = YourMathf.ClampAngle( transform.localEulerAngles.x, minX, maxX );
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