JigLibX

Source code checked in, #18130

noone88 — Fri, 10 Oct 2008 16:59:21 GMT

Small Bugfix in BoxStatic Mesh.

New Post: AddBodyImpulse() for Bullets

AaronD — Thu, 09 Oct 2008 00:58:44 GMT

Hey everyone,

I am trying to shoot some bullets from a tank, and they seem to be flying off in the wrong direction. I'm sure it's a simple math problem that I've overlooked.

Basically it gets the rotation and pitch of the tank turret.

      direction.X += (10.0f * (float)Math.Sin(tank.TurretRotation - (float)Math.PI / 2));
      direction.Z += (10.0f * (float)Math.Cos(tank.TurretRotation - (float)Math.PI / 2));
      direction.Y += (10.0f * (float)Math.Sin(tank.TurretPitch));

which this should give me the direction vector. What I do next is in my bullet controller:

      foreach (Bullet b in bullets)
      {
            if (b.Alive && b.NeedsImpulse)
            {
                  bulletVelocity = Vector3.Normalize(b.Direction);
                  bulletVelocity *= 300.0f;

                  b.Body.ApplyBodyImpulse(bulletVelocity);
                  b.NeedsImpulse = false;
           }
      }

Basically if the bullet hasn't yet had an impulse applied to it, apply the impulse to 'fire' the bullet in the specified direction. The only thing is though that the more I increase the multiplier (300.0f) the more the velocity is wrong. When the turret is at a 90, 18, 270 or 0 degree horizontal angle, the bullet lines up with the crosshair, but anything in between it is off by at most 45 degrees.

Thanks everyone

New Post: question about touching objects

Eth — Tue, 07 Oct 2008 19:52:56 GMT

This issue is not what I would called solved, the one line comment makes it slightly better, but SphereMeshCollision still has many issues. Turn on wireframe and draw some of the normals that are coming out of that method, it's all over the place. I don't mean to be negative, just saying it's not fixed.

New Post: error CS1577: Assembly generation failed

noone88 — Sat, 04 Oct 2008 22:35:58 GMT

strong encrypt it

New Post: More .Nety

noone88 — Sat, 04 Oct 2008 22:34:42 GMT

Iam not working on this at the moment.... but you are free to do this :)

New Post: question about touching objects

noone88 — Mon, 29 Sep 2008 20:25:00 GMT

the issue was already solved - search this forum for more details

New Post: question about touching objects

Eth — Mon, 29 Sep 2008 19:14:55 GMT

From my testing I believe the issue resides in the SphereMeshCollision Method, and the collision normal/collision depth that it returns/calculates. Quite noticable if you test with a bunch of spheres on a triangle mesh (plane/bowl/etc) anything where the spheres are suppose to come to rest after a while, you'll notice the large majority of them never do because they are bouncing off of things that they shouldn't be. Cubes do tend to act better with there mesh interactions, not 100% though.

New Post: How do i get the car to roll completely over?

MadHatter — Sun, 28 Sep 2008 00:53:46 GMT

i have gotten the car to roll over but it just sits on its lid instead of carrying the momentum that it should into completing another roll...

New Post: How do i get the car to roll completely over?

MadHatter — Sat, 27 Sep 2008 22:59:01 GMT

First off i want to inject my own model as the car, i suppose i have to convert it from .max to .fbx and then substitute it in as the car model to make it easy? and i also want it to be able to carry momentum into multiple rolls if applicable, instead of when it rolls onto its side it just slides and then comes to a stop and rolls back onto its wheels... Also i am trying to change the camera view to the follow the car, and use heightmaps that were saved in a different program as a bmp and xml file. Confused as hell, im new to c , but i am a rampant user of vb :(

New Post: question about touching objects

SimReality — Sat, 27 Sep 2008 20:44:22 GMT

Has this issue gotten any more attention? I'm having the exact same issue and have no idea how to resolve it. I've made the effect somewhat less noticeable by tweaking the iterations for collisions and things, but it's still very noticeable.

New Post: error CS1577: Assembly generation failed

mrhadley83 — Tue, 16 Sep 2008 06:11:58 GMT

jiglibX doesnt have a strong encrypted name.

How do i solve this im using visual 2005

-Fredrik

New Post: Strange thing happen when creating boxes

Eth — Mon, 15 Sep 2008 19:37:32 GMT

Ah what I meant with the collision islands is, if you look at the main overall physics function, in PhysicsSystem.Integrate. This is what it goes through to update everything. One of the functions it does is create CollisionIslands which helps in determining what to activate/deactivate. This is generally correct the first time it creates them, but once items fall asleep, wacky things happen because it only creates these islands with the activate bodies, if you draw the islands you can see strange stuff. Especially if you plan on deleting items from the physics system while the it is running you'll probably have to update this method.

New Post: What does physicSystem.CollisionSystem = new CollisionSystemGrid(32, 32, 32, 30, 30, 30); do?

mrhadley83 — Wed, 10 Sep 2008 12:51:57 GMT

Im just wondering becuase when i made it larger i collide with many more objects but i also get a lot of more collisions i guess that becuase
they touch the plane they are standing on.

I dont really understand it even when i go inside the function sure it sets up a grid and also allocates space for a certain amount of boxes but what
exactly does each parameter do?

I also noticed a strange thing when the car accelerates and turns in a larger grids it makes small jumps its almost like it touches invisible boxes or something.

I would be very glad for a reply thanks for a great engine

New Post: Strange thing happen when creating boxes

mrhadley83 — Wed, 10 Sep 2008 10:12:14 GMT

I found it, my grid wasnt big enough didnt think of that.
physicSystem.CollisionSystem = new CollisionSystemGrid(132, 132, 132, 130, 130, 130);
before i had
physicSystem.CollisionSystem = new CollisionSystemGrid(32, 32, 32, 30, 30, 30);

this shouldnt be static values at all i havent had time to change them thou.
is should really be size of the scene.

thanks for the help Eth.

New Post: Strange thing happen when creating boxes

mrhadley83 — Wed, 10 Sep 2008 06:21:14 GMT

The weird thing is that i alrady update the boxes separately, i have tried to add the lines object.setActive(); when creating the objects. Nothing new happens.

i only have around 50 objects on screen so it shouldnt be to much i think.

Im quite new to jiggleX, when you talk about collision islands what do you mean with islands??

New Post: Strange thing happen when creating boxes

Eth — Tue, 09 Sep 2008 19:12:05 GMT

I believe these errors have to do with the collision islands that have some problems. the ones that aren't collidable i'm assuming are inactive and not getting reactivated correctly. I ended up rewriting the portion a bit and having 2 methods, one for the initial creation of the islands and one for updating pre-existing islands.

New Post: How Rotate the primitive box off center of object

acarvalhocba — Tue, 09 Sep 2008 15:18:40 GMT

Hi folks...

Im trying rotate the primitive box (height: 2, lenght: 50, width: 2), but your center of transform exist in your center of object...

I need center of transform in the corner left...

please, someone know how rotate this object this way???

Im using "object.PhysicsBody.MoveTo(translation,orientation)"...

thanks...

New Post: Strange thing happen when creating boxes

mrhadley83 — Tue, 09 Sep 2008 08:28:03 GMT

BoxObject obj;

int Perimeter = 10;

int iterations = 2;

int StartX = -100;

int StartY = -14;

int StartZ = -10;

int stepsX = 18;

int stepDown = 0;

List<BoxObject> objects = new List<BoxObject>();

// in this first loop i create 20 boxes top and bottom , here 7 boxes that i create isnt collidable
for (int topBottom = 0; topBottom < iterations; ++topBottom)

{

for (int countBoxes = 0; countBoxes < Perimeter; ++countBoxes)

{

obj =

new BoxObject(baseGame, FetchModel(PHYS_MODEL_TYPES.BOX), new Vector3(19.0f, 5.0f, 2.0f), Matrix.Identity, new Vector3(StartX + (stepsX * countBoxes), StartY, StartZ + stepDown));

objects.Add(obj);

}

stepDown += 140;

}

int stepsZ = 15;

int stepLeftRight = 0;

// in this loop i create 20 boxes left and right , the strange thing is that 3 boxes from this list isnt collidable
for (int leftRight = 0; leftRight < iterations; ++leftRight)

{

for (int countBoxes = 0; countBoxes < Perimeter; ++countBoxes)

{

obj =

new BoxObject(baseGame, FetchModel(PHYS_MODEL_TYPES.BOX), new Vector3(2.0f, 5.0f, 16.0f), Matrix.Identity, new Vector3(StartX + stepLeftRight, StartY, (StartZ+5) + (stepsZ * countBoxes)));

objects.Add(obj);

}

stepLeftRight += 150;

}

// here i add the boxes i have created to my physList which updates all of them.
for (int countObjects = 0; countObjects < objects.Count; ++countObjects)

{

objects[countObjects].PhysicsBody.Immovable =

true;

physProperties.Add(

new PhysEntity(objects[countObjects], GetPhysID(), true, PhysicsType.OBJECT, COLLISION_TYPE.PLAYER_COLLISION));

}

objects.Clear();

// The thing i wonder is why isnt all boxes collidable when i create them in a similar way. I set all the boxes to immovable but some of them
// i can still go right through like they arent even there i have tested to add the collision skins manually but that doesnt work either.

Anyone that has any tips.

New Post: Creating a trailer

mrhadley83 — Tue, 02 Sep 2008 12:50:51 GMT

Hi again in my game i have tried to create a trailer that runs after my car.

I added a Hinge joint and set values to it. But i cant get the desired effect, when i connect it to my car it looks a little strange and i want the lenght of the hinge to be longer.
So it looks like an actula trailer. i have used these values for testing i dont know if i figured them out wrong.

            float haldWidth = 0.2f;
            float sidewaysSlack = 0.5f;
            float damping = .52f;

            Vector3 hingeVec = player.GetCar.PhysicsBody.Position - BodyToConnect.Position;

            player.dragHook = new HingeJoint();
            player.dragHook.Initialise(
                 player.GetCar.PhysicsBody,
                 BodyToConnect,
                 hingeVec, // is normalized in this function
                 new Vector3(0.0f, 0.1f, 0.0f),
                 haldWidth,
                 35.0f,
                 35.0f,
                 3.0f * sidewaysSlack,
                 damping);

            player.dragHook.EnableHinge();

// i want the trailer to be able to turn 35 degrees in each direction, and i would like the hingeVec to be larger doesnt look like a hinge currently only looks like a
static trailer with no life at all.

New Post: Separate Collision Responses

mrhadley83 — Tue, 02 Sep 2008 12:38:10 GMT

If at a certain point i would like an object to stop colliding with my character but still collide with my level how do i do that?

I know that i can remove collision skins but if i do that my object falls through the ground, i want it to still have collision but not against my player.