Kinematic object moving by itself when game runs

I am stumped and I don't know what is going on.

I have a gameobject with rigidbody2d attached, it is set to kinematic so it SHOULD NOT move.

X is at 12, and when the game runs, X becomes 12.00005

There is nothing else attached, only the rigid body.

Why is my object moving? Bug?
It appears that the position can not be set too.
If i set it to 13, it becomes 13.0005.
If i set it to 13.55, it becomes 13.54998

Update:
It appears this is caused by "Simulate", not sure what this is as I recently upgraded from 5.3 to 5.6. Why is Simulate altering the position of a kinematic/static object? What is simulate?

 

How are you checking the transform of these objects? Are you using debug.log()? Also, is 12.00005 really not good enough? 12.00005 is essentially 12.

Edit: also are you setting it to isKinematic in script or the inspector?

 

I am inspecting it from editor.

I am using the position to check for some other stuff so it needs to be an exact match. Kinematic is set from editor.

No, 12.00005 is not 12. 12 is 12, 12.00005 is 12.00005.

The fact is that static objects are meant to be static and it should not move. Moving by .00005 is moving, thus not static.

Update:
I tried to disable simulate, position is fixed but trigger no longer works.

 

I'm not sure why its different you may have to post some screenshots.

I asssume you are trying to compare float/double values like this:

Code (CSharp):

1. if(float1==float2)
2. {
3. doSomething();
4. }

If so it is a bad idea since float values will rarely equat on that level of accuracy. You should compare aproximate values instead or whole numbers.

An easy solution would be simply to set the position via script at runtime. Then it will be 12.000000000000000000000000 so that away you can have the accuracy on a subatomic scale.

 

I care about the vector position and that is what I am comparing.

Vector2 a = Vector2(12,5);
Vector2 b = Vector2(12.00005, 5);

is a == b ? false

As i've mentioned previously, setting the position does not set the position I want.
If i set vector x to 13, it becomes 13.0005.
If i set vector x to 13.55, it becomes 13.54998

 

Vectors are just a set of float numbers. As I said before trying to compare two floats as you are doing is a bad idea but it's your project so do what you want.

You never mentioned if you tried setting the position at runtime. Have you tried setting the position at runtime via script not inspector? That's what a meant in my last post. You never mention trying it via script.

 

You'll just need to accept that floating points numbers aren't perfectly accurate. I recommend implementing an IsCloseTo extension method, like this:

Code (CSharp):

1. public static bool IsCloseTo(this Vector3 self, Vector3 other, float epsilon) {
2.     return Mathf.Abs(self.x - other.x) < epsilon && Mathf.Abs(self.y - other.y) < epsilon && Mathf.Abs(self.z - other.z) < epsilon;
3. }

Then, instead of `v1 == v2` in your code, you'd write `v1.IsCloseTo(v2, epsilon)`, where epsilon is some small float value, like 0.0001f. That's the typical way floats are compared.