Comments on: XNA Collision Detection for 3D models – Part 1

By: Sharky

Sharky — Tue, 27 Jul 2010 09:59:04 +0000

Hi, and thanks. I'm not sure, but I did notice the creators.xna.com site now has a sample on collision that includes an OrientedBoundingBox (i.e. not axis-aligned like the standed BoundingBox). Take a look at it here. It's for XNA 4.0, but if it's XNA 3.1 your after, perhaps the BoundingOrientedBox.cs class could be ported over easily? Otherwise google for terms like non-axis alligned bounding box, oriented bounding box etc...

By: Cupido

Cupido — Tue, 27 Jul 2010 09:22:42 +0000

Hi, Great tutorial here for boundingsphere. Do u have a simple way to create a boundingbox for a model? Any example codes for it? Please help me as I already spent 1 full week on this topic. Thanks.

By: Sharky

Sharky — Wed, 12 May 2010 04:04:42 +0000

Thanks Dave.

By: Dave

Dave — Wed, 12 May 2010 03:37:33 +0000

Great.
This work fine, I’m never using bounding boxes again, until I absolutly need them. Using bounding spheres is far quicker and if used correctly, accurate for collisions between round objects and straight objects.
Keep up the good work!

By: Shtivo

Shtivo — Wed, 14 Jan 2009 10:59:21 +0000

Is this Sharky an architect tutor from Oxford Brookes??????????

By: Sharky

Sharky — Mon, 12 Mar 2007 20:36:49 +0000

No, I’m not outputting any collision from the 3d editor. Do you mean like some kind of low poly collision mesh?

As far as editors go, I built most of my model with Milkshape, but was having problems with that and export formats until I tried 3DStudio Max. That’s what my model was exported with in the end, but I’ve done no more work with 3DStudio Max since. I want to find a tool I can actually afford.

I really want to use the Softimage|XSI Mod Tool. It’s free, powerful and relatively intuitive. Just having some problems with its .x export at the moment.

See this thread…
https://creators.xna.com/forums/thread/1211.aspx

By: Cogs

Cogs — Mon, 12 Mar 2007 20:27:10 +0000

What 3d model editor are you guys using?
Are you outputting a collision from the 3d editor ?

By: Sharky

Sharky — Wed, 21 Feb 2007 19:24:11 +0000

I’m guessing Microsoft are brewing up some goodies for the next release. Here’s hoping there’ll be more support for more serious collision detection. :p

I can appreciate how the technique used in this article would certainly be less effective in FPS style games. The player tends to be a lot more aware of whether a shot should have hit or missed. Sphere’s are a bit two approximate for that – unless your character IS a sphere. (mental note to oneself: game idea #76. “Pacman 2007″)

By: RJ

RJ — Wed, 21 Feb 2007 19:04:58 +0000

I was going to use a model for a level but this means its impossible to implement the collision detection because I can’t get at the verticies. How are you supposed to make a first person shooter in XNA? I guess you can’t. The model which i use as a level is too detailed for me to attempt to add hundreds of boxes and spheres and to try and manage them myself would be a waste of effort.

I know having a model for a level is probably not the pro the way to do it but for a really simple game it would have worked fine because the 360 is quite powerfull. I was amazed at how well it was running actually the framerate is great even with an enormous model as a level. Now I will have to try and build some kind of home brew level editor?

Perhaps I should stick to a 2d game until they finish xna. Or am I missing something big? I’m very disapointed.

By: Sharky

Sharky — Thu, 08 Feb 2007 19:55:10 +0000

nice