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Question by marian42 · Aug 26, 2018 at 12:02 PM · physics

How to prevent a rigidbody from colliding with a child rigidbody

I have a car with a rigidbody and colliders and an item with a rigidbody and colliders. The player puts the item into the car and pushes a button. The item becomes a child element of the car and I set its collider to kinematic. Now the car's door closes and the door collider intersects with the item. The item's rigidbody exerts a force on the car and it flies away in an uncontrollable way.

I can't disable the collider or rigidbody.detectCollision because the item should still receive raycasts and collide with things other than the car. I can't remove the rigidbody because as soon as you take out the item, it needs physics again. I can't use layers because there can be unlimited cars and items and I don't want to create a new layer for each car and item. Physics.ignoreCollision would require me to find all colliders in the car and item and then ignore collisions for all combinations.

What is the most elegant solution for this?

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avatar image eses · Aug 26, 2018 at 02:37 PM 0
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@marian42 - All cars can be in one layer, all items can on another layer. Player can interact with both? Why would you need layer for each car, anyway, there is very limited amount of layers, it is not meant to be used for each unique item. Also, screenshot / picture and better explanation would help, but if you don't want to show what you are creating, then draw a simple picture.

avatar image marian42 eses · Aug 26, 2018 at 03:00 PM 0
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If an item is attached on the outside of a car, it still needs to collide with other cars. Therefore, I think two layers are not enough. Can you explain what exacly you want me to draw?

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