Support collidable moving parts

[Luomu]

About damn time, if I may say so.

From a modeller's point of view, you just name a piece of animated geometry "collision_d_whatever" (d for dynamic) and it'll be added as collidable instead of visible geometry. I recommend sticking to simple cubes, and only when they are really necessary, like space station doors.

Now, the implementation is a bit hairy... we need to to tie CollisionGeometry nodes (which may have a complex chain of transforms) into the collision system's Geom objects. To achieve this:

• CollisionVisitor links a GeomTree with a CollisionGeometry node (GeomTrees are libColliders triangle data, and shared)
• when ModelBody creates Geoms, it matches them with CollisionGeometries using the CollisionGeometry-GeomTree link (Geoms are per-body objects, and have a transform)
• before moving Geoms, ModelBody needs to accumulate the animated transform for each CollisionGeometry (implemented as DynCollUpdateVisitor)

Limitations: the way collisions work in Pioneer, moving geoms won't push the linked geoms around. That'd be... physics. Like, if a ship extends an animated landing gear into a surface, it'll just go through, and only collide when the ship moves.

The dynamic collmeshes aren't visible in the modelviewer yet because that's tricky :(

[Luomu]

For a test case, I've got this...thing. http://paahdin.com/projects/pioneer/multicoll.7z
Replace Wave model with it, toggle landing gear and go fly at some buildings.

[fluffyfreak]

It looks good, a lot cleaner too. Seems like you did a lot of tidying up in implementing it all :)
Didn't get chance to test that's just from reading through the code but I didn't spot anything bad.

Plus you got rid of a filthy global ;)

[Luomu]

You could test it by adding collision to hoop_stations, all it takes is one box moving in sync with the doors. I can't import the .daes properly into Blender.

[fluffyfreak]

Hopefully this isn't waiting on me having time to test it by learning how to animate a spacestation door? :/

It looks good to go in and then someone will eventually be able to make use of it, and the new idle animations, in their new models or updating existing ones.

[robn]

Nah, I've just been short on time and brain for it. I'm going to read over it and probably merge it tomorrow.

[robn]

This is great!

It occurs to me that its not a big step from here to being able to damage parts of the ship independently. We just need a separate hit counter per collision geom, right? :)