Re: [Super-tux-devel] Gameloop Rewrite Status

[Tobias <tob...@gm...>]

Am Fr, den 02.01.2004 schrieb Bill Kendrick um 16:04:
> On Fri, Jan 02, 2004 at 06:04:51PM -0500, Tobias Gläßer wrote:
> > 
> > One possibility is to check if the "rectangle" of an object hits the
> > "rectangle" of another object, like we currently do, but I don't like
> > this method, because it isn't very precise. On the other hand it's
> > relativly fast.
> 
> I almost always stick to 'bounding box' (what you described above)
> because it's fast, simple to program, and for most fast action games
> it's "close enough."
> 
> The trick is to give the player a slight advantage.  (e.g., their
> bullet can hit just outside the enemy's x,y/w,h range, but the
> enemy's bullet actually has to be a little INSIDE the player's rectangle,
> otherwise it's ignored)
> 
> Super Tux is a fast action game, but can go slowly (e.g., the player
> can walk around a little to try to make a precise hit, or just be
> standing there when a bad guy aimlessly bumps into Tux), so it MIGHT
> be worth doing more precise collision detection.
> 
> I think, though, that so far the bounding box method has done well
> in Super Tux, so I would much rather we worry about adding gameplay
> elements (more enemies, more kinds of objects to deal with, and
> more levels and level art).  If we REALLY need to fix the mechanics,
> we can do it later. :^)
> 
> The biggest complaint in the 3 years since I first released Super Tux
> was that there was only one level and few enemies. :^)  Not that
> Tux didn't collide with laptops 'precisely' ;^)
> 
> 
> 
> -bill!
> 
> PS - FYI, I recently had to do line-intersection for collision detection for
>      a vector-drawn game I'm prototyping for my new job... :^)
>      I first do bounding-box to decide whether I need to BOTHER with the
>      slow line-related math, of course.  Keep this trick in mind!!

I'm trying my luck with bitmask-collisions, but first doing bounding-box
tests is obviously.

My aim with this rewrite is to make it very is easy to add funky new
enemies and items. I'm sure that's a better way of doing something in
the long run, than to add more code to already bloated code.

Greetz...

Tobias Gläßer