Hi,

Once a custom skin is created at run-time, there is no way to delete attachments that were added to it. Within the Skin class I can see an internal class named AttachmentMap, which has a "remove()" method, but it doesn't seem to be used anywhere, with no references to it from the Skin class.

I added a new method to the Skin class in my local code, as follows:

void Skin::removeAttachment(size_t slotIndex, const String& name) {
    _attachments.remove(slotIndex, name);
}

Now, this works for me, but is there a reason that this was never provided in the API? Does it have any side effects that you are aware of?

Also, from searching this forum, I read comments regarding calling this method to clear an attachment, but it didn't work:

void Skeleton::setAttachment(const String &slotName, const String &attachmentName)

Calling it like this didn't remove the attachment, even though internally I can see it sets the slot attachment to null on the skeleton:

skeleton->setAttachment("SlotID", "");

Is Skeleton::setAttachment(SlotId, "") supposed to delete the attachment from the currently assigned skin too?

badlogic a écrit

However, the reason we don't have removeAttachment is because Skin::setAttachment(slotIndex, name, NULL) is equivalent to what you are doing in terms of semantics.
I'm curious, how were you able to call Skin::setAttachment() without the third parameter?

I never mentioned anything regarding Skin::setAttachment(), since it doesn't actually exist in the v3.7 C++ runtime, so I'm not sure what you're referring to.

The C++ 3.7 run-time has these:

void Slot::setAttachment(Attachment *inValue);

void Skeleton::setAttachment(const String &slotName, const String &attachmentName);

I'm using the current stable version of Spine (3.7.xx), and the v3.7 run-time to match.

badlogic a écrit

If you want to remove an attachment from a skin, you have to do so on the skin itself. You can get the currently active skin like this:

Skin* skin = skeleton->getSkin();
skin->addAttachment(slotIndex, name, NULL);

That's the first thing I tried, but it doesn't work, because it will assert on a null attachment, as you can see from the implementation:

void Skin::addAttachment(size_t slotIndex, const String &name, Attachment *attachment) {
   assert(attachment);
   _attachments.put(slotIndex, name, attachment);
}

That's the reason for this entire thread, since I literally tried whatever I could see in the API before coming here to ask about it, and nothing worked.

So, any other ideas I could try, or should I just stick with the Skin::removeAttachment() function that I added to my own code (it seems to be working fine so far)?

That is good news, and thank you for the info!