Character vs character contact

[LeXXik]

Is it possible to get character vs character contact without a listener? I am going through the contact list returned by character.GetActiveContacts(), but the mCharacterIDB that it returns is invalid.

[jrouwe]

Yes, that seems to work for me. If I disable the listener in CharacterVirtualTest then GetActiveContacts still returns the other character when I walk into it.

[LeXXik]

Hmm. Sorry, this was supposed to be a question for JS repository.

I modified the default example, to add an inner body shape, disable the listener and add a new char using the same settings:

settings.mInnerBodyShape = standingShape;
character = new Jolt.CharacterVirtual(settings, Jolt.RVec3.prototype.sZero(), Jolt.Quat.prototype.sIdentity(), physicsSystem);
// character.SetListener(characterContactListener);

const character2 = new Jolt.CharacterVirtual(settings, Jolt.RVec3.prototype.sZero(), Jolt.Quat.prototype.sIdentity(), physicsSystem);

This will add a new character (albeit invisible, as no visual mesh, but you will collide with it at origin). Then, in onExampleUpdate, I am trying to read the contact while standing on top of it:

const charContacts = character.GetActiveContacts();
console.log(charContacts.size())
for (let i = 0, end = charContacts.size(); i < end; i++) {
    const contact = charContacts.at(i);
    console.log(contact, contact.mCharacterIDB.IsInvalid()) // true
}

Am I missing something else?

[jrouwe]

Character vs Character Inner Body contacts will not have a valid mCharacterIDB, this will give you a mBodyB contact (and only if the layers are configured so that the inner body collides with the other character). This way of doing it is not recommended.

In order to collide with other CharacterVirtual's you need to set an interface to make characters aware of each other (Jolt does not track CharacterVirtual objects):

JoltPhysics.js/JoltJS.idl

Line 3299 in 0a5d19c

void SetCharacterVsCharacterCollision(CharacterVsCharacterCollision inCharacterVsCharacterCollision);

You can use this simple implementation:

JoltPhysics.js/JoltJS.idl

Lines 3112 to 3116 in 0a5d19c

	interface CharacterVsCharacterCollisionSimple {
	void CharacterVsCharacterCollisionSimple();
	void Add(CharacterVirtual inCharacter);
	void Remove(CharacterVirtual inCharacter);
	};

to which you Add both characters and which you pass to both characters through SetCharacterVsCharacterCollision. Each character will ignore itself when using this interface.

[LeXXik]

That worked! Thank you!