New answers tagged tools
Yes, the standard approach is to have some kind of plugin API. The details of this approach will vary based mainly on the implementation of your overall toolset and the needs of your game and its tools. What you've described here is a reasonable first start at a plugin system for your own tools. It sounds like it works for you, so you should keep exploring ...
V-HACD V2.0 provides better decomposition results than HACD. Check it out! http://kmamou.blogspot.ca/2014/11/v-hacd-v20-is-here.html
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