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

[Ricardo C. <ri...@ae...>]

 Another way to go for 2d collisions is to make use of geometry shapes...
 For instace, those normal enemies in Mario (that had the teeth shown), cou=
ld=20
be assumed as a circle. Tux is like a ellipse. There are some fast algorith=
ms=20
to calculate circles/ellipses curve.
 For a game of mine, I was implementing a collision system where we had the=
=20
information about the lines that limitate the surface and then we would jus=
t=20
check them with each other...

 But maybe the best approach would be to use the current collision system a=
nd,=20
for special tiles, like terrains with a triangular shape, we would consider=
=20
them to be triangles.

Hope to be helpfull, :)
 Ricardo Cruz

Em S=C3=A1bado, 3 de Janeiro de 2004 19:00, o Tobias Gl=C3=A4=C3=9Fer escre=
veu:
> Am Sa, den 03.01.2004 schrieb Ingo Ruhnke um 07:50:
> > Ricardo Cruz <ri...@ae...> writes:
> > >  You could also have a look at one of the Ingo's games, like
> > > Windestille or Pingus (they are c++, but may be helpfull).
> >
> > Pingus uses just a single pixel (or sometimes two) for collision
> > detection. Windstille, even so it has some bitmask code, doesn't use
> > it at the moment and instead uses some quick collision-rectangle
> > hacks. So both aren't really good examples.
> >
> > Using multiple bitmaskes (one for the top, another one for the sides)
> > might work, calculating the entry-vector into the enemy might also
> > provide some informations, but I havn't really found out myself on how
> > to solve this problem cleanly.
>
> My aim is to calculate the angle in which object A got hit by object B,
> like described in the tutorial Ricardo showed us.
> And I don't want to use bitmap-collisions for all objects, but for Tux
> in example. :)
> The code handling already calculated collisions will look like this:
>
> void badguy_collision(bad_guy_type* pbad, int c_object, int angle)
> {
> /* Handle collision with Tux, but don't touch tux's internals, only
> touch the badguy's internals */
> if(c_object =3D=3D CO_TUX)
> {
>
> if(angle =3D=3D 0)
> pbad->dying =3D FALLING;
> ...
>
> }
> }
>
>
>
> Greetz...
>
> Tobias Gl=C3=A4=C3=9Fer

=2D-=20
I do not know whether I was then a man dreaming I was a butterfly, or
whether I am now a butterfly dreaming I am a man.
		-- Chuang-tzu