<![CDATA[How would I go about making objects bounce off the window's edges or another object? (Pure Data GEM))]]>I am essentially imagining something akin to the DVD screensaver, where it bounces off the edges continuously forever. Is this possible in GEM, and if so, how could I go about doing this?

]]>http://forum.pdpatchrepo.info/topic/15939/how-would-i-go-about-making-objects-bounce-off-the-window-s-edges-or-another-object-pure-data-gemRSS for NodeMon, 05 Oct 2026 17:16:15 GMTSun, 04 Oct 2026 03:37:42 GMT60<![CDATA[Reply to How would I go about making objects bounce off the window's edges or another object? (Pure Data GEM)) on Sun, 04 Oct 2026 03:39:38 GMT]]>I am essentially imagining something akin to the DVD screensaver, where it bounces off the edges continuously forever. Is this possible in GEM, and if so, how could I go about doing this?

]]>http://forum.pdpatchrepo.info/topic/15939/how-would-i-go-about-making-objects-bounce-off-the-window-s-edges-or-another-object-pure-data-gemhttp://forum.pdpatchrepo.info/topic/15939/how-would-i-go-about-making-objects-bounce-off-the-window-s-edges-or-another-object-pure-data-gemSun, 04 Oct 2026 03:39:38 GMT<![CDATA[Reply to How would I go about making objects bounce off the window's edges or another object? (Pure Data GEM)) on Sun, 04 Oct 2026 14:01:20 GMT]]>@fussicks have a look at page 138 of this very useful document...... https://forum.pdpatchrepo.info/topic/12033/multimedia-programming-with-pure-data ... which will show how to do that.
(You might have already downloaded it 5 months ago to solve your previous problem.)

If you then want to go further then see the pmpd library if it is available for your OS or download Pd Extended if not.
David.

]]>http://forum.pdpatchrepo.info/topic/15939/how-would-i-go-about-making-objects-bounce-off-the-window-s-edges-or-another-object-pure-data-gem/2http://forum.pdpatchrepo.info/topic/15939/how-would-i-go-about-making-objects-bounce-off-the-window-s-edges-or-another-object-pure-data-gem/2Sun, 04 Oct 2026 14:01:20 GMT<![CDATA[Reply to How would I go about making objects bounce off the window's edges or another object? (Pure Data GEM)) on Sun, 04 Oct 2026 20:43:02 GMT]]>I have a lot of this type of stuff on patchstorage with gem files. for basic constant speed vector you make a stair-case type movement up a number in y, and over a number in x. repeatedly and it looks like its travelling diagonally etc.

https://patchstorage.com/explore/?search_query=&tax_platform[]=pd-vanilla&tax_post_tag=&orderby=modified&wpas_id=search_form&wpas_submit=1

this one is sort of low-fi but has the vector stair-case type system.
https://patchstorage.com/pd-gem-foos-ball-like-videogame-for-hid-controller/

this one is pmpd easy vector mass
https://patchstorage.com/hidi-midi-joystick-cannon-game-pd-vanilla-gem-pmpd-hid/

this is a boucing circle
https://patchstorage.com/pmpd-xy-min-max-drawing-system-pd-vaniila-gem-pmpd/

]]>http://forum.pdpatchrepo.info/topic/15939/how-would-i-go-about-making-objects-bounce-off-the-window-s-edges-or-another-object-pure-data-gem/3http://forum.pdpatchrepo.info/topic/15939/how-would-i-go-about-making-objects-bounce-off-the-window-s-edges-or-another-object-pure-data-gem/3Sun, 04 Oct 2026 20:43:02 GMT<![CDATA[Reply to How would I go about making objects bounce off the window's edges or another object? (Pure Data GEM)) on Mon, 05 Oct 2026 09:10:09 GMT]]>@fussicks this sounds like something I attempted about nine years ago, It may help, but it wasn't very accurate with the collisions
https://forum.pdpatchrepo.info/topic/10993/bounce-a-foray-into-gem
image.png

]]>http://forum.pdpatchrepo.info/topic/15939/how-would-i-go-about-making-objects-bounce-off-the-window-s-edges-or-another-object-pure-data-gem/4http://forum.pdpatchrepo.info/topic/15939/how-would-i-go-about-making-objects-bounce-off-the-window-s-edges-or-another-object-pure-data-gem/4Mon, 05 Oct 2026 09:10:09 GMT