How to know which CharacterVirtual did collide?

[hugarty]

I'm using this GetTransformedShape().CollideShape() to check if a CharacterVirtual collide with the box.

        CharacterList list = context->getCharacterList(); 
	for (int i = 0; i < list.size(); i++) {
		list[i]->virtual.GetPtr()->GetTransformedShape().CollideShape(
				box_shape,
				inShapeScale, 
				JPH::Mat44::sTranslation(box_shape->GetCenterOfMass()),
				settings, 
				JPH::RVec3::sZero(), 
				collector);
	}

The CharacterVirtual doesn't have a innerBody.

I want to know which one did I collide.
The information inside collector.mHit did not give me some way to find out which are these CharacterVirtual:

I thought in some ways to do that but, I want to know if there is a "Jolt way" or function to do that?

[jrouwe]

If you're not colliding against bodies then the standard collectors cannot give you the context you need, so you'll have to implement your own collector. You can use CollisionCollector::SetUserData with the character as parameter before calling CollideShape so that in the CollisionCollector::AddHit function you know and can store which character the hit is for.

This pattern is used here:

JoltPhysics/Jolt/Physics/Character/CharacterVirtual.cpp

Line 64 in e5272c0

ioCollector.SetUserData(reinterpret_cast<uint64>(c));

JoltPhysics/Jolt/Physics/Character/CharacterVirtual.h

Line 564 in e5272c0

virtual void SetUserData(uint64 inUserData) override { mOtherCharacter = reinterpret_cast<CharacterVirtual *>(inUserData); }

JoltPhysics/Jolt/Physics/Character/CharacterVirtual.cpp

Lines 303 to 313 in e5272c0

	if (inResult.mBodyID2.IsInvalid())
	{
	// Assuming this is a hit against another character
	JPH_ASSERT(mOtherCharacter != nullptr);
	// Create contact with other character
	mContacts.emplace_back();
	Contact &contact = mContacts.back();
	sFillCharacterContactProperties(contact, mOtherCharacter, mBaseOffset, inResult);
	contact.mFraction = 0.0f;
	}