Re: [pygame] Physics, collision detection etc?

["Nirav Patel" <olpc@xxxxxxxxxxxxxx>]

Peter,

If the polygons are Surfaces or can be turned into Surfaces, they can
be turned into Masks to do pixel collision.  Though, I may be
misunderstanding what you are trying to do.

Nirav

On Tue, Oct 7, 2008 at 11:21 AM, Peter Gebauer
<peter.gebauer@xxxxxxxxxxxxxxxxxxxxx> wrote:
> Hey Nirav!
>
> Yep, but as I said, I need to find colliding polygons, not pixels.
>
> /Peter
>
> On 2008-10-06 (Mon) 12:05, Nirav Patel wrote:
>> Peter,
>>
>> There are some new functions in SVN in the mask module.  New ones
>> since 1.8.1 that could be useful for collision are:
>>
>> Mask.overlap_mask - Returns a mask of the overlapping pixels
>> Mask.draw - Draws a mask onto another
>> Mask.erase - Erases a mask from another
>> Mask.count - Returns the number of set pixels
>> Mask.centroid - Returns the centroid of the pixels in a Mask
>> Mask.angle - Returns the orientation of the pixels
>> Mask.connected_component - Returns a mask of a connected region of pixels.
>>
>> The mask module does pixel collisions pretty quickly.  I think on
>> modern systems it shouldn't be a significant difference (compared to
>> say, blitting) between using pixel perfect detection and something
>> like the seperating axis theorem.
>>
>> Nirav
>>
>> On Mon, Oct 6, 2008 at 11:27 AM, Peter Gebauer
>> <peter.gebauer@xxxxxxxxxxxxxxxxxxxxx> wrote:
>> > Hey guys!
>> >
>> > I've been looking around for various libraries that handle
>> > intersection/colliding polygons/line segments, I'm just wondering if/when
>> > there will be polygon shapes and additional collision testing functions
>> > that can be used seemlessly with the old rect and mask libraries that
>> > already exist in PyGame?
>> >
>> > /Peter
>> >
>>
>