moonODE (Open Dynamics Engine (ODE)) bindings

[pgimeno]

I believe he meant:

Code: Select all

  for k,v in pairs(t) do

can be replaced with:

Code: Select all

  for k,v in next,t do

You can replace them all at once, by overriding the default pairs() function with this one:

Code: Select all

function pairs(t)
  return next, t, nil
end

[zorg]

As for when the next version releases (probably both 11.5 and 12.0), soon(tm) maybe, but it's just a mildly informed and moreso assumed hunch

[kikonen]

LÖVEly, learned importanat didbit on how Lua and "pairs" actually works in iteration

[kikonen]

Compiled LÖVE 11.5 from the HEAD of main, doing trials to see if it fixes oddities I've encountered.

[pgimeno]

I said:

You can replace them all at once, by overriding the default pairs() function with this one:

Code: Select all

function pairs(t)
  return next, t, nil
end

Alas, that won't work. You need a different name, otherwise it compiles to the same thing.

Code: Select all

function xpairs(t)
  return next, t, nil
end

[kikonen]

ok, I've had my app running for 20+min now in bacjground, and it's still working fine. With LÖVE 11.4, couldn't run it this long without hitting strange issues (like all objects disappering, random "table" becomes nil/number and such).

Thus with pretty good confidence I state that LÖVE 11.5 is fixing those rather major bugs I encountered

EDIIT: Just to be double sure, compiled love 11.5 also in my VMWare linux guest, and similarly there it seemed to work much more robustly.

[kikonen]

Just for the sake of reference and completeness, issue what I created in 3DreamEngine for this topic https://github.com/3dreamengine/3DreamEngine/issues/67 (in case anyone else tumbles over this same topic).

[josip]

Interesting work, I never heard of moonODE.

I worked on lovr's physics, so to elaborate some points: at this moment lovr also uses ODE library as external dependency. Unlike moonODE, lovr's bindings are opinionated to make physics usage simpler and straightforward. Many ODE features are omitted on purpose, and supported ones are made to be very nice to use from Lua. For example, you can build and render newton's cradle in ~10 lines of code.

Most lovr users are actually quite frustrated with the ODE's simulation. Some colliders have very jerky and unreliable collision responses (cylinders in particular are awful) and other features don't work well. Notably the mesh collider is treated as triangle soup, so it won't detect collisions if body is completely inside the mesh. Also ray casting against terrain is broken in latest version. The community around ODE is getting thin and engine is not actively developed. For all these reasons and some more we are currently moving towards Jolt, the most modern and actively supported open source physics engine.

BTW the desktop (non-VR) support in lovr has improved a LOT over past year. It no longer requires rendering workarounds and there's now built-in support for keyboard and mouse (and lib for game controllers). But it won't work on some old GPUs if their driver doesn't support for Vulkan.