How can i implement a collision detection while don't need the collision effect

Questions & Answers
1

I want to implement a function like that: when one spriteA touch other spriteB， spriteB changed its color， and do not need the collision effect, instead, the spriteA should be displayed over spriteB. How can I set parameters for the two sprites? Thanks a lot!

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2

Set your colliders as triggers, and then use OnTriggerEnter, OnTriggerExit etc.:
http://unity3d.com/learn/tutorials/modules/beginner/physics/colliders-as-triggers

3

Add a collider (your choice) and click on the "Is trigger " checkbox. This insures that the collision effect is identified but without the effects of a collision i.e physics. So on your script use the following

function OnTriggerEnter(col : collider){

enter your code here
}

You can also use the

function OnTriggerExit(col : collider){

enter your code here to behave when exiting the collider
}

i hope this helps

4

Yes, That really works. Thanks!