Re: [stella] collision detection

Subject: Re: [stella] collision detection
From: "C. Bond" <cbond@xxxxxxxxxxxxx>
Date: Mon, 08 Sep 2003 16:43:43 -0700
Eckhard Stolberg wrote:

> > After an attempt at 'optimizing'  the collision detection in a port of
> > Stella, I found that Freeway no longer detected collisions, but the
> > other programs I tested were OK. Is there some strange trick used in
> > Freeway to catch collisions between the chickens and cars?
> In Freeway all the cars are drawn with the same player. Also both
> chicken are drawn with two copies of the same player. In order to
> detect independent collisions for both chickens Freeway resets
> the collision detection registers twice per scanline just before
> the chicken is about to be displayed.
> Ciao, Eckhard Stolberg

Thanks! That helped me track down and eliminate the problem.


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