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Face

Description​

This component causes the entity's transform to follow a face tracked in XR. It will show and hide the entity as the face is found or lost.

Properties​

PropertyTypeDefaultDescription
idnumber1The id of the face that is currently being tracked out of the number of faces tracked, specified by the active camera

Functions​

Get​

Returns a read-only reference.

Example

ecs.Face.get(world, component.eid)

Set​

Ensures the component exists on the entity, then assigns the (optional) data to the component.

Example

ecs.Face.set(world, component.eid, {
  id: 1,
  addAttachmentState: false
})

Mutate​

Perform an update to the component within a callback function. Return true to indicate no changes made.

Example

ecs.Face.mutate(world, component.eid, (cursor) => {
  cursor.id = 1;
  cursor.addAttachmentState = true;
  return false;
})

Remove​

Removes the component from the entity.

Example

ecs.Face.remove(world, component.eid)

Has​

Returns true if the component is present on the entity.

Example

ecs.Face.has(world, component.eid)

Reset​

Adds, or resets the component to its default state.

Example

ecs.Face.reset(world, component.eid)

Advanced Functions​

Cursor​

Returns a mutable reference. Cursors are reused so only one cursor for each component can exist at a time.

Example
ecs.Face.cursor(world, component.eid)

Acquire​

Same behavior as cursor, but commit must be called after the cursor is done being used.

Example
ecs.Face.acquire(world, component.eid)

Commit​

Called after acquire. An optional third argument determines whether the cursor was mutated or not.

Example
ecs.Face.commit(world, component.eid)
ecs.Face.commit(world, component.eid, false)

Dirty​

Mark the entity as having been mutated. Only needed in a specific case where systems are mutating data.

Example
ecs.Face.dirty(world, component.eid)