Comments on: JiglibFlash: Using Constraints

By: KIVagant

KIVagant — Mon, 17 May 2010 14:19:10 +0000

Thank you!!!
Thank you!!!
Thank you!!!
Thank you!!!
=)

By: carlos lunetta

carlos lunetta — Thu, 19 Mar 2009 16:46:19 +0000

Thanks again!

By: richard mattka

richard mattka — Thu, 19 Mar 2009 11:47:55 +0000

@carlos, try setting the allowedDistance and timescale attributes of the JConstraint to as small as possible (you’ll have to experiment a little with it). I will try to work on a demo of this (compound shapes) and if I need to add things to the classes I’ll let you know and post some updates.

@julapy, thanks for stopping by, much appreciated. If you look at the walls in my demos so far, those are all flat planes. In jiglib, we call them JPlanes. If you download the latest rev of the code and the first example here, you will see the basics for creating a JPlane which you then map to your 3d engine’s visual representation of a Plane (Plane3D). I’ll try to post a “Getting Started…” tutorial with the basics laid out. I have been hesitating, because we are working so much on the code but I think it could be handy anyway.

By: julapy

julapy — Thu, 19 Mar 2009 07:00:16 +0000

hi, really like your experiments using jiglib.
trying to figure out if its possible to use flat planes in the same way as boxes in jiglib…?
figured it’d be possible to apply rigid body physics to flat planes as well as cubes and spheres… is that right?

By: carlos lunetta

carlos lunetta — Tue, 17 Mar 2009 02:08:33 +0000

Thanks for the reply! One last question: any hints on removing the elasticity?

By: richard mattka

richard mattka — Tue, 17 Mar 2009 01:36:09 +0000

@carlos, Well its a bit hacky but you can construct your shape from primitives, cubes and spheres or your own if you are inclined. Use Jconstraints to join them and make them non elastic, so completely rigid. Try altering the mass of individual objects as well to create different centers of mass. For example if you wanted to make a hammer, you could try constraining 2 cubes, one long one and one smaller one on the top. You’d have to rotate the top one and then “join” them. When I have time, (which seems to be less and less lately) I’ll work up a demo of that. Also, if you have time look at the source for the car demo(s) that are linked to off the google code site for jiglibflash. Good luck and let me know how you’re making out!

By: carlos lunetta

carlos lunetta — Mon, 16 Mar 2009 22:45:03 +0000

Do you know if there’s a way to constrain 2 rigid bodies in a way to make a rigid joint between them? Like a hack to limit all properties of a constrained body, only using its mass influence.
Thanks!