Input.GetTouch(index) is NOT the fingerID

Questions & Answers
1

Hello guys. I have the next issue:

On my game, I check if a touch is inside a zone and if it does, I save its fingerID in a variable, let’s say finger, so that I can get its position on every frame.

The problem is that when I use Input.GetTouch(finger) I realized that the touch index is not always the finger id.

How do I know that? If I touch (finger index 0) and again (finger index 1) and then release the first one (index 0), the finger index 1 now is the 0, but it keeps its fingerID number (1) so it is the touch index 0 and finger id 1.

The question is, is there a way to make reference to the touch by its finger ID instead of its index?

Sorry if my English is not good…

2

No, there is no direct way of doing this.
What you can do is create a wrapper class of Input and have a dictionary of type { int fingerid, Touch t } which is updated by wrapper class for each update and use dictionary[touchid] whenever you need to access the touch.

3

I run a loop in touches array and find the new touch with the same fingerid in every frame. I know it’s not efficient but it’s reliable if you want to track a unique finger.

GetUpdatedTouch(int fingerIdAtStart)
{

foreach(var touch in Input.touches)
{
if(touch fingerid==fingerIdAtStart
return touch;
}
return default;
}