Sorry but that was meant to be a surprise for the community. We did not mean to exclude anyone. And even though to be honest we literally finalize the API a few days before the release:)
Havok remains a Microsoft asset and its code source is not oss. We are talking about the AAA physics engine used in a crazy ton of large games. It is still free with MIT licensing for Babylon users:) so a big gift if you ask me.
I let @cedric answer all the technical questions as the physics API v2 is his baby
On the heap size, we build with emscripten and use it’s defaults (16MiB, if I recall correctly) but because we can’t predict how much memory any application will use, we compile with “-sALLOW_MEMORY_GROWTH=1”
If there’s any extra information you feel is lacking from the docs, please let us know!