JigLibX

New Post: Beginner JigLibX - Sphere Collision to Mesh Collision in this Case?

Spartan2417 — Sat, 23 Feb 2013 14:07:57 GMT

Ive literally had a week of looking a JigLibx for a game project im doing.
At the moment i want to use the engine for collision between my camera and a custom built Maya .fbx. The maya model is of a Cube (6 sides) and on each middle of a side is a square hole, the idea being to allow the camera to go through those holes, but not inside of the cube.

What is the best way of doing this? Im heading towards having a triangle mesh for the cube and having a primitive for the camera but id like to know if this is the best way or theres a better one?

New Post: Vehicle on Network

stark7 — Tue, 15 Jan 2013 01:40:36 GMT

So this might be a late solution response but here it goes anyway. Create a waypoint controller that reads an array of Vector3 which are the waypoints and then only send those from the server to the client. You will need to do a lot more customization but this is probably a very good start.

New Post: rotating Heightmap

stark7 — Mon, 14 Jan 2013 12:35:51 GMT

Hello,

I am looking at the examples inside JiggleGame and I was wondering, is there any way to apply a yaw pitch roll to the heightmap?

One thing that I tried is associating the collisionskin with the body inside the HeightmapObject and then rotating that body with the MoveTo function but that doesn't work.

body.MoveTo(shift, Matrix.CreateRotationZ(0.2f));

body.Immovable = true;

body.EnableBody();

Is there any other way to do this or are we only supposed to work with this horizontally?

This library is fantastic!

New Post: TimeStep per body and negative TimeSteps

pcaston2 — Thu, 13 Dec 2012 16:47:53 GMT

Well I realized that when TimeSpan is negative, objects maintain the same velocities, I will have to look into "fixing" this. Also the collisions seem to only happen on the inside of objects (as if they were inside out) so this might take some work.

Other then that, it's working pretty well. Simply passing a different change in time to each object worked as intended. There was one special case where two objects collided that had the same velocity (Dot product was zero, therefore collision wasn't handled properly). To solve it, I simply scaled the velocity for the dot product calculation by the dilation, which should resolve all collision issues.

I rained some cubes on a 'slow spot' that dilates time around it with falloff. It can be seen here:

http://www.youtube.com/watch?v=JFd1JTdb1gs

New Post: Time Dilation

pcaston2 — Wed, 12 Dec 2012 16:23:28 GMT

I'm trying to change the engine so that each object can process time at a different speed. So far I've created a TimeBody that inherits body, and has an extra parameter called dilation, initially set to 1.0.

Within the PhysicsSystem I am going through Integrate and going to all the functions which pass dt (difference in time) and altering them so they call the functions, for each body, using dt multiplied by the new dilation variable.

The goal is to be able to change the dilation value dynamically, and have the objects work at different speeds relative to each other.

Do you think this could work, or would it take too much tweaking to do in this engine?

Issues I know that might come up are:

What happens when two objects with the same velocity collide as a result of different dilation? (this might work fine)

What happens when a negative dt is passed (I tried passing a negative in before modifications, it seems funky, I'll have to consider using an absolute value and flipping the velocities in these special cases)

Any advice would be great!

My background:

I've got a fair bit of algebra and calculus know-how, built simple 2D engines, this is the first time with a 3D engine, but I have 3D experience so it all makes pretty good sense to me.

Source code checked in, #94877

Project Collection Service Accounts — Mon, 01 Oct 2012 22:38:35 GMT

Upgrade: New Version of LabDefaultTemplate.xaml. To upgrade your build definitions, please visit the following link: http://go.microsoft.com/fwlink/?LinkId=254563

Source code checked in, #94876

Project Collection Service Accounts — Mon, 01 Oct 2012 22:31:06 GMT

Checked in by server upgrade

Patch Uploaded: #12771

RedToasty — Sun, 26 Aug 2012 23:38:56 GMT

RedToasty has uploaded a patch.

Description:
The below causes issues with springs bottoming out and cars not getting any grip. Fixed in this change.

Patch Uploaded: #12770

RedToasty — Sun, 26 Aug 2012 23:08:08 GMT

RedToasty has uploaded a patch.

Description:
Negative gravity causes cars to crash in a nasty mash of NaNs. Negative gravity lead to negative spring, which was squared rooted to give the damping and we had NaNs. These end up in the Velocities and Positions before it crashes.

New Post: SegmentIntersect collision angle

lordikon — Mon, 13 Feb 2012 14:58:05 GMT

furrie wrote:

Hi,

tanks for the response, but it wasn't needed any more (the thread was created over a year ago)

I figured as much, it was more for anyone else that came across the forums with a similar question.

New Post: SegmentIntersect collision angle

furrie — Mon, 09 Jan 2012 08:40:38 GMT

Hi,

tanks for the response, but it wasn't needed any more (the thread was created over a year ago)

New Post: SegmentIntersect collision angle

lordikon — Mon, 09 Jan 2012 05:29:48 GMT

A segment intersection will return to you a normal vector. Normalize the line segment you used to check for segment intersection, and then do a dot product between your normalized vector and the normal vector you got as a result of the intersection. Then you use acos to change your dotproduct to an angle (in radians).

Vector3 ray = new Vector3(0f, 0f, 0f);
float dist;
CollisionSkin skin;
Vector3 pos, normal;
 
ImmovableSkinPredicate pred = new ImmovableSkinPredicate();
Segment seg = new Segment(ray, Vector3.Down * 1000.0f)
 
world.CollisionSystem.SegmentIntersect(out dist, out skin, out pos, out normal, seg, pred);

// Get the segment you made as a vector
Vector3 segmentVector = ray + (Vector3.Down * 1000.0f);
segmentVector.Normalize();

float dotProduct = segmentVector.Dot(normal);
float angle = (float)Math.Acos(dotProduct);

New Post: Ray<->Heightfield Collision

lordikon — Sun, 08 Jan 2012 05:59:22 GMT

LordIkon wrote:
Ok, next question. If I create a ray, and pass it to JigLibX, is there a feature where it would return to me each thing that ray hit, in order, and the intersection point of each collision?

Also, do rays collide with the insides of shapes, or only the outsides?

Anyone know if JigLibX supports something like this? I don't want to check a line segment against all physics in my scene, I want to cast a line segment and have it return to me all collisions and details about those collisions.

New Post: JigLibX on Windows Phone 7

Cygon — Mon, 23 May 2011 07:37:55 GMT

For your utmost convenience, here's the link: Port to XNA 4.0 and Windows Phone 7.

There also appears to be an XNA 4.0 port in the repository here on CodePlex, but I don't know if it supports Windows Phone 7.

EDIT: Fixed font size. Copy & paste from other CodePlex page causes huge fonts that don't show as such in the WYSIWYG editor :-S

New Post: JigLibX on Windows Phone 7

SomeCallMeTim14 — Mon, 23 May 2011 03:23:19 GMT

JigLibX runs on WP7. I use it in my app RC-AirSim which is on the phone marketplace right now. Take a look under the Issue Tracker tab for the code I used.

New Post: JigLibX on Windows Phone 7

Gruger — Mon, 23 May 2011 02:11:42 GMT

Cygon,

Were you able to port it to Windows Phone 7?

Could you help me do the same?

Updated Wiki: Home

noone88 — Sat, 23 Apr 2011 16:26:17 GMT

JigLibX Physic Library

JigLibX is a specially for XNA designed C# port of the Physic Engine "JigLib" (Link below)

If you want to support the development of JigLibX, make a small Donation

Magicka

Launch in another window

Break a Leg

Launch in another window

News

There is a collision skin editor available. It's based on JigLibSDX - the SlimDx port of the engine - but it also works for JigLibX.
http://jiglibsdx.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=32044

Experimental: Character controller sample
JigLibX_Character.zip

Links

JigLibX Files to Be Ported
Videos
Screenshots

JigLibX Wiki and Forum
http://jiglibx.wikidot.com/

JigLib Library
http://www.rowlhouse.co.uk/jiglib/index.html

Updated Wiki: Home

noone88 — Sat, 23 Apr 2011 16:25:49 GMT

JigLibX Physic Library

JigLibX is a specially for XNA designed C# port of the Physic Engine "JigLib" (Link below)

If you want to support the development of JigLibX, make a small Donation

Break a Leg

Launch in another window

Magicka

Launch in another window

News

Links

JigLibX Files to Be Ported
Videos
Screenshots

JigLibX Wiki and Forum
http://jiglibx.wikidot.com/

JigLib Library
http://www.rowlhouse.co.uk/jiglib/index.html

Updated Wiki: Home

noone88 — Sat, 23 Apr 2011 16:25:00 GMT

JigLibX Physic Library

JigLibX is a specially for XNA designed C# port of the Physic Engine "JigLib" (Link below)

If you want to support the development of JigLibX, make a small Donation

Break a Leg

Launch in another window

Magicka

Launch in another window

News

Links

JigLibX Files to Be Ported
Videos
Screenshots

JigLibX Wiki and Forum
http://jiglibx.wikidot.com/

JigLib Library
http://www.rowlhouse.co.uk/jiglib/index.html

Commented Issue: Port to XNA 4.0 and Windows Phone 7 [14784]

Cygon — Sat, 19 Feb 2011 10:25:08 GMT

Hi!

I ported the current development trunk to Windows Phone 7 (which doesn't compile out of the box because unsafe code and stackalloc aren't supported).

I "fixed" most problem methods by cloning them into an #if WINDOWS_PHONE .. #endif section. Needless to say that this added to the mess already made by the #if USE_STACKALLOC .. #endif sections in the library, so I'd recommend to only see this port as a stop-gap measure you could point people to until there's an officially WP7 build.

The attached file contains binaries for XNA 4.0 x86, Xbox 360 and Windows Phone 7, source code and a patch (in unified diff format) detailing my changes.
Comments: ** Comment from web user: Cygon **

@Rives: I signed the assembly with my key, but (of course) didn't ship my key with this build. Just pick another key or disable assembly signing ;)