polytronicgr / jitterphysics Goto Github PK

- What steps will reproduce the problem?

1. Just create a single body constraint,
2. call world.AddConstraint(..),
3. and get an instant NullReferenceException.

- What version of the product are you using?

The latest from the repository.

- Please provide any additional information below.

NullReferenceException: Object reference not set to an instance of an object
Jitter.Collision.IslandManager.AddConnection (IslandManager.cs:169)
Jitter.Collision.IslandManager.ConstraintCreated (IslandManager.cs:61)
Jitter.World.AddConstraint (World.cs:499)

IslandManager.AddConnection(RigidBody body1, RigidBody body2) doesn't expect 
body2 to be null.

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Could you translate this physics engine Unity3d compatible??

Because of my upstream game engine only supports .net 2.0, is there any plan to 
provide support for it?, as in jitter i can see it heavily using lingq.

What steps will reproduce the problem?
1. Place cubes on top of each other (tightly) lying directly on the floor.
2. Run simulation

What is the expected output? What do you see instead?
Structure should be stable, but instead it "jiggles" and collapses.
https://youtu.be/Lw0G0a7tphk

What version of the product are you using? On what operating system?
Latest version from svn with OpenTK on Win7

Please provide any additional information below.
Step is done like this:
   world.Step((float)milliseconds / 1000, _worldSimulationMultiThread, 1f / 60f, 2);

All other properties of RigidBody and Material are default.

I think the sample in XNA provided current is a little complex.
Can provide some simple sample just to show how to move and rotate control 
according to mouse event in the world and detect collision?
In Winform or WPF will also be OK.
Thanks.

Comments said:
/// <summary>
/// Raycasts a single body. NOTE: For performance reasons terrain and 
trianglemeshshape aren't checked
/// against rays (rays are of infinite length). They are checked against 
segments
/// which start at rayOrigin and end in rayOrigin + rayDirection.
/// </summary>


But really, for CompoundShape it works similar.

/// <param name="rayOrigin"></param>
/// <param name="rayEnd"></param>
/// <returns></returns>
public override int Prepare(ref JVector rayOrigin, ref JVector rayEnd)
{
    JBBox box = JBBox.SmallBox;

    box.AddPoint(ref rayOrigin);
    box.AddPoint(ref rayEnd);

    return this.Prepare(ref box);
}

Workaround - make long rays.
Something like raydir*100.

Please add Nuget package.

        /// <summary>
        /// Transforms a vector by the transposed of the given Matrix.
        /// </summary>
        /// <param name="position">The vector to transform.</param>
        /// <param name="matrix">The transform matrix.</param>
        /// <param name="result">The transformed vector.</param>
        public static void TransposedTransform(ref JVector position, ref JMatrix matrix, out JVector result)
        {
            float num0 = ((position.X * matrix.M11) + (position.Y * matrix.M12)) + (position.Z * matrix.M31);
            float num1 = ((position.X * matrix.M21) + (position.Y * matrix.M22)) + (position.Z * matrix.M23);
            float num2 = ((position.X * matrix.M31) + (position.Y * matrix.M32)) + (position.Z * matrix.M33);

            result.X = num0;
            result.Y = num1;
            result.Z = num2;
        }


Bug at first line.
Must be:
... + (position.Z * matrix.M13);

Hi,

Just wondering if this physics engine is deterministic, at least on same 
platform???


Thanks!