Some viewer internal questions

[animats]

(Some detailed questions about specific C++ code deep inside the viewer. If there is a better forum for this, please let me know.)

1. Given an LLViewerObject, how do you get its human-readable name? (Needed for debug messages)
2. How does viewer side parenting in llviewerobject.cpp after the comment "fix object parenting" differ from sim side parenting? Nominally SL doesn't have a full hierarchy (children of children) but this code looks like it supports one. Seated avatars seem to be children of the object they're sitting on, and attachments seem to be the children of avatars. That's a 3-level hierarchy.
3. In llviewerobject.cpp, there are several occurrence of

   ((LLVOAvatar*)this)->setFootPlane(collision_plane);

   This is an unchecked downcast of LLViewerObject* to LLVOAvatar*. But LLVOAvatar has multiple inheritance:

   class LLVOAvatar :
       public LLAvatarAppearance,
       public LLViewerObject,
       public boost::signals2::trackable

   Downcasting a LLViewerObject to an LLVOAvatar is not legal C++ in this situation. I think. The LLViewerObject and its containing LLVOAVatar object don't start at the same address. The compiler won't catch that. Am I missing something, or is this storing into the wrong place? I think a dynamic cast, which checks, would be neeeded in this situation.

[animats]

(3) turns out to work OK; I wrote test code. There's a bad cast if the sim sends a message in avatar format to a non-avatar, but that's unlikely. Should use dynamic_cast for safety, but it's not causing actual trouble in operation.

[Whirly Fizzle]

You may be better posting these sorts of questions to the OpenSource-Dev mailing list
http://wiki.secondlife.com/wiki/OpenSource-Dev

[animats]

On 9/15/2018 at 10:34 AM, Whirly Fizzle said:

You may be better posting these sorts of questions to the OpenSource-Dev mailing list
http://wiki.secondlife.com/wiki/OpenSource-Dev

Five years ago, yes. Traffic there is very low now. Zero during September. However, I did post a few things, like how to build successfully on Linux, a question someone asked in August.

I have two replies. One is in German, from an autoresponder at a German magazine. The other is a porno spam.

[Beq Janus]

Yeah, I'm not sure that's actively maintained. I asked to be added (via the subscriber link) but I have never seen any traffic.