I've been discussing the development of a decal platform for another game, called continuum. Some programmers who help support this game (nobody actually works for any company, its 100% community driven) have said they are against it because the only way to do something like this is to edit the actual game client or to create a packet intercepter or a program like Cheat Engine. Is this true?

You can read their responses here: http://forums.ssgn.net/topic/25858-continuum-decal-platform/page__pid__275699

 

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It intercepts packets and reads memory directly from the client.