Mouse over a part

[KospY]

Ok, I'm stuck on something... I'm using a raycast to get the part under the cursor in flight, and everything is fine.

Unfortunatly, I recently discover that the raycast do not hit some vessel parts (like the small scientific parts).

I think it's because KSP remove colliders of some parts for an unknow reason. What can I do for that ?

Do I need to change the method ? Is there another option to detect part mouse hover/exit ? It really bother me to add a component on every part for adding onmousehover method, as raycasting is far better for what i'm working on.

Edited February 9, 2015 by KospY

[sarbian]

Did you try to change the layerMask used for the raycast ? The part should have a collider but may use a different layer. You could check the part.gameObject.layer of the part and then adjust the layer mask.

[Diazo]

Unfortunately this seems to be an issue where a small part hides inside the collider of a larger object. When I struggled with this (back in KSP 0.24, no guarantees things have not changed) you could zoom in so the small part filled 90% of your screen and you would still select the larger object when you clicked on it.

I spent quite a long time on this before I gave up and simply listened for the right-click part menu on the small parts of this type.

I'd love to know how Squad does it, it is obviously possible because they open the right-click menu correctly for the small part, but I spent hours on this myself and was not able to figure out how.

It is not a layer issue, the raycast I was using had no mask applied and so should have hit every layer.

The one bit of knowledge I have since gained that I did not know at the time I looked at this, is the part physicless/massless? I wonder if that is the key to what is selectable or not.

D.

[KospY]

I finally found a way to do it

I checked and the collider exist on this parts too, so it's not a problem with a missing collider. However, I found that the attached rigidbody is changed to the parent part.

I used "hit.transform.gameObject.GetComponent<Part>();" to get the part component, but I think hit.transform.gameObject return the rigidbody gameobject.

To get the correct part component, you need to go throught all parents of the collider gameobject until you find the part. After making my own custom method, I found that KSP already have something to go throught all parents : "UIPartActionController.GetComponentUpwards". I just used it to find the part from the collider and it seem to work.

So, here is the method for people interested :

        private Part GetPartUnderCursor()
        {
            RaycastHit hit;
            Part part = null;
            if (Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, 1000, 557059))
            {
                part = (Part)UIPartActionController.GetComponentUpwards("Part", hit.collider.gameObject);
            }
            return part;
        }