OpenSimMirror/OpenSim/Region/Physics/BulletSPlugin/BSPrimDisplaced.cs

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using System;
using System.Collections.Generic;
using System.Reflection;
using System.Runtime.InteropServices;
using OpenMetaverse;
using OpenSim.Framework;
using OpenSim.Region.Physics.Manager;

using OMV = OpenMetaverse;

namespace OpenSim.Region.Physics.BulletSPlugin
{
public class BSPrimDisplaced : BSPrim
{
    // 'Position' and 'Orientation' is what the simulator thinks the positions of the prim is.
    // Because Bullet needs the zero coordinate to be the center of mass of the linkset,
    //     sometimes it is necessary to displace the position the physics engine thinks
    //     the position is. PositionDisplacement must be added and removed from the
    //     position as the simulator position is stored and fetched from the physics
    //     engine. Similar to OrientationDisplacement.
    public virtual OMV.Vector3 PositionDisplacement { get; set; }
    public virtual OMV.Quaternion OrientationDisplacement { get; set; }
    public virtual OMV.Vector3 CenterOfMassLocation { get; set; }
    public virtual OMV.Vector3 GeometricCenterLocation { get; set; }

    public BSPrimDisplaced(uint localID, String primName, BSScene parent_scene, OMV.Vector3 pos, OMV.Vector3 size,
                       OMV.Quaternion rotation, PrimitiveBaseShape pbs, bool pisPhysical)
        : base(localID, primName, parent_scene, pos, size, rotation, pbs, pisPhysical)
    {
        CenterOfMassLocation = RawPosition;
        GeometricCenterLocation = RawPosition;
    }

    public override Vector3 ForcePosition
    {
        get
        {
            return base.ForcePosition;
        }
        set
        {
            base.ForcePosition = value;
            CenterOfMassLocation = RawPosition;
            GeometricCenterLocation = RawPosition;
        }
    }

    public override Quaternion ForceOrientation
    {
        get
        {
            return base.ForceOrientation;
        }
        set
        {
            base.ForceOrientation = value;
        }
    }

    // Is this used?
    public override OMV.Vector3 CenterOfMass
    {
        get { return CenterOfMassLocation; }
    }

    // Is this used?
    public override OMV.Vector3 GeometricCenter
    {
        get { return GeometricCenterLocation; }
    }


    public override void UpdateProperties(EntityProperties entprop)
    {
        // Undo any center-of-mass displacement that might have been done.
        if (PositionDisplacement != OMV.Vector3.Zero)
        {
            // Correct for any rotation around the center-of-mass
            // TODO!!!
            entprop.Position -= PositionDisplacement;
        }

        base.UpdateProperties(entprop);
    }
}
}