How to use OverlapCollider to check for trigger colliders

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I want the method Collider2D.OverlapCollider to be able to only check for trigger colliders. However, even after reading the scripting reference for the ContactFilter2D, i am still not able to understand how to use it. Does anyone know how to set the contact filter?

This is my current code: (colList is a list created to store a list of colliders)

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ContactFilter2D c = new ContactFilter2D(); c.useTriggers = true; https://docs.unity3d.com/ScriptReference/ContactFilter2D-useTriggers.html

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2 Answers

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I know this is an old question, but I figured it out for anybody else who comes across this. You need to specify your ContactFilter2D has no filters:

        List<Collider2D> colliderList = new List<Collider2D>();
        ContactFilter2D contactFilter = new ContactFilter2D();
        int colliderCount = myCollider2D.OverlapCollider(contactFilter.NoFilter(), colliderList);

If you pass in an empty ContactFilter2D, it will not check for Triggers, however if you specifcy NoFilters(), it will.

Thanks for the answer!! This works!

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I ran into the same issue. By default, ContactFilter2D already filters triggers (which I find very counterintuitive - if I forget to configure a filter, just don't let it filter anything?). An alternative to first calling NoFilter() would be to set useTriggers to true. var filter = new ContactFilter2D(); filter.useTriggers = true; I feel they should have named it filterTriggers instead, in which case it would've been fine set to false by default.

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Making the ContactFilter2D public and configuring it in the inspector is easier / could help learn parameters :0)