And here is probably the first one that got implemented:
http://news.lugnet.com/cad/?n=9002
That said, since SR3D is clearly the first successful one, I agree that we have at least a de-facto standard to work from...
http://news.lugnet.com/cad/?n=9002
That said, since SR3D is clearly the first successful one, I agree that we have at least a de-facto standard to work from...