Help with puting cylinder between two spheres...

Hi guys! I am having trouble understanding why this simple thing isn't working.

I have two speheres, and I have cylinder. I want to position cylinder between two spheres and then rotate cylinder so it connects two spheres (last step would be to scale the stick so it does actually connect the spheres)

puting cylinder between two spheres is easy:

Code (CSharp):

1. var midPoint = Vector3.Lerp(a.position, b.position, 0.5f);
2.         stick.position = midPoint;

i tried to do the rotating like this:

Code (CSharp):

1.  stick.rotation = Quaternion.LookRotation((b.position - a.position).normalized);

and the result is show in the image below

so it does rotate but it seems that orientation of the cylinder is wrong to begin with.
i tried several other options like this:

Code (CSharp):

1. stick.rotation = Quaternion.LookRotation((b.position - a.position).normalized, transform.forward);
2. ...
3. stick.rotation = Quaternion.LookRotation((b.position - a.position).normalized, transform.right);

but nothing worked like it should.

then i made empty game object, put cylinder inside and rotated it for 90 degress on x axis
then running above code it gives me good result like in the image below:


so the result is good but cylinder should be scaled so it connects the spheres...i managed to do that like this:

Code (CSharp):

1. stick.SetScaleZ(distance / 2f);

SetScaleZ is extension method that is just helper.

result is the image below


so my question is how to optimize this, avoid the dummy object and initial rotation for 90 degrees. also is there better way to connect the spheres but just scaling the object?

Thank you!

 

do your rotation like this

Code (csharp):

1.  
2.   transform.rotation = Quaternion.LookRotation((b.position - a.position).normalized) * Quaternion.Euler(Vector3.right * 90f);
3.  

 

Scale is done in terms of Unity unitys, right? Primitives of scale 1 are also 1 unit in height? You could try setting the z scale to half of the distance between the 2 spheres.

 

ya a default cylender is 1 unit long, though you mean the y axis since unity is a y-up engine

 

Yea lol.

 

Code (csharp):

1.  
2.   transform.position = Vector3.Lerp(a.position, b.position, 0.5f);
3.   transform.rotation = Quaternion.LookRotation((b.position - a.position).normalized) * Quaternion.Euler(Vector3.right * 90f);
4.   transform.localScale = new Vector3(transform.localScale.x, Vector3.Distance(a.position, b.position) * 0.5f, transform.localScale.z);
5.