Unity contact points without collider

2
votes

I have a spinning object Which has a box collider on it, as it spins it will be coming in contact with a mesh collider on another object, as it does this the mesh is going to deform dependent on where the box hits. I need to know where it is the box hits to be able to make these deformations, however I also want the box not to feel any forces from the mesh as when I do that my entire parent structure spazzes out and flies off to a far away land.

If any one can help that would be great,

Thanks

EDIT: I don't necessarily need the collision information just every point inside either the box collider the game object it would be associated with when the collision happens, from there I can check the values

2
c#unity3dcollision-detectioncollision
Hello and welcome to SO! Please read the FAQ on how to ask a good question. In the meantime you can provide us with some code showing what you have tried so far. - user1064248
Most of the code I used I don't have any more. I have tried using OnCollisionEnter() which works and does what I want, but it will eventually glitch in some way and send my player flying. I also tried usung OnTrigger enter using the Collider.bounds but that is not accurate enough for something that is rotating. I tried increassing the mass of my rigidbodies to the maximum to see if it would make my player more stable, that didnt seem to help very much. - Oblivion181
You may need to do a raycast to the point so you can get the coordinates of the hit on a cartesian plane. - Apollo SOFTWARE
OnCollisionEnter or OnTriggerEnter (if you set collider as trigger) will be able to look at the individual collisions and then capture the x,y,z. of collision.position (Vector3). - Apollo SOFTWARE

2 Answers

0
votes

You will need to use the OnCollision so you get the Collision info, you cant use OnTrigger since you only get a Collider which lacks the info you requested.

The problem is that when you have a object that reacts to OnCollison you WILL get the physical reaction of the collision no mater what.

What you can do is store the objects velocity and/or angular velocity in every fixed update and then read them back after the collision. Im not sure if you can read back the values in the OnCollisionEnter or if you need to record the collision with a bool and then do it in the next fixed update