how detect if a collider, that stay fixed, is touch by a moving object

Questions & Answers
1

I’m tring to make a fire object that burn wood object .

When the fire move and hit the wood, the wood catch fire, but if the fire stay in a place and is the wood that move in to fire, collision don’t happen.

This is the script in fire object:

 void OnTriggerEnter(Collider other) 
{
Debug.Log ("fire have hit " + other.name);

if (other.name == "wood")     
      do stuff...
}

fire is rigidbody and kinematic,
wood is trigger

2

The Wood also needs a rigidbody. Anything that moves needs a rigidbody to wake up other sleeping rigidbodies (like your fire).