opensim-development – Rev 1
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/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
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* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyrightD
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the OpenSimulator Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using OpenSim.Region.Physics.Manager;
using OMV = OpenMetaverse;
namespace OpenSim.Region.Physics.BulletSPlugin
{
public class BSActorHover : BSActor
{
private BSFMotor m_hoverMotor;
public BSActorHover(BSScene physicsScene, BSPhysObject pObj, string actorName)
: base(physicsScene, pObj, actorName)
{
m_hoverMotor = null;
m_physicsScene.DetailLog("{0},BSActorHover,constructor", m_controllingPrim.LocalID);
}
// BSActor.isActive
public override bool isActive
{
get { return Enabled; }
}
// Release any connections and resources used by the actor.
// BSActor.Dispose()
public override void Dispose()
{
Enabled = false;
}
// Called when physical parameters (properties set in Bullet) need to be re-applied.
// Called at taint-time.
// BSActor.Refresh()
public override void Refresh()
{
m_physicsScene.DetailLog("{0},BSActorHover,refresh", m_controllingPrim.LocalID);
// If not active any more, turn me off
if (!m_controllingPrim.HoverActive)
{
SetEnabled(false);
}
// If the object is physically active, add the hoverer prestep action
if (isActive)
{
ActivateHover();
}
else
{
DeactivateHover();
}
}
// The object's physical representation is being rebuilt so pick up any physical dependencies (constraints, ...).
// Register a prestep action to restore physical requirements before the next simulation step.
// Called at taint-time.
// BSActor.RemoveDependencies()
public override void RemoveDependencies()
{
// Nothing to do for the hoverer since it is all software at pre-step action time.
}
// If a hover motor has not been created, create one and start the hovering.
private void ActivateHover()
{
if (m_hoverMotor == null)
{
// Turning the target on
m_hoverMotor = new BSFMotor("BSActorHover",
m_controllingPrim.HoverTau, // timeScale
BSMotor.Infinite, // decay time scale
1f // efficiency
);
m_hoverMotor.SetTarget(ComputeCurrentHoverHeight());
m_hoverMotor.SetCurrent(m_controllingPrim.RawPosition.Z);
m_hoverMotor.PhysicsScene = m_physicsScene; // DEBUG DEBUG so motor will output detail log messages.
m_physicsScene.BeforeStep += Hoverer;
}
}
private void DeactivateHover()
{
if (m_hoverMotor != null)
{
m_physicsScene.BeforeStep -= Hoverer;
m_hoverMotor = null;
}
}
// Called just before the simulation step. Update the vertical position for hoverness.
private void Hoverer(float timeStep)
{
// Don't do hovering while the object is selected.
if (!isActive)
return;
m_hoverMotor.SetCurrent(m_controllingPrim.RawPosition.Z);
m_hoverMotor.SetTarget(ComputeCurrentHoverHeight());
float targetHeight = m_hoverMotor.Step(timeStep);
// 'targetHeight' is where we'd like the Z of the prim to be at this moment.
// Compute the amount of force to push us there.
float moveForce = (targetHeight - m_controllingPrim.RawPosition.Z) * m_controllingPrim.RawMass;
// Undo anything the object thinks it's doing at the moment
moveForce = -m_controllingPrim.RawVelocity.Z * m_controllingPrim.Mass;
m_physicsScene.PE.ApplyCentralImpulse(m_controllingPrim.PhysBody, new OMV.Vector3(0f, 0f, moveForce));
m_physicsScene.DetailLog("{0},BSPrim.Hover,move,targHt={1},moveForce={2},mass={3}",
m_controllingPrim.LocalID, targetHeight, moveForce, m_controllingPrim.RawMass);
}
// Based on current position, determine what we should be hovering at now.
// Must recompute often. What if we walked offa cliff>
private float ComputeCurrentHoverHeight()
{
float ret = m_controllingPrim.HoverHeight;
float groundHeight = m_physicsScene.TerrainManager.GetTerrainHeightAtXYZ(m_controllingPrim.RawPosition);
switch (m_controllingPrim.HoverType)
{
case PIDHoverType.Ground:
ret = groundHeight + m_controllingPrim.HoverHeight;
break;
case PIDHoverType.GroundAndWater:
float waterHeight = m_physicsScene.TerrainManager.GetWaterLevelAtXYZ(m_controllingPrim.RawPosition);
if (groundHeight > waterHeight)
{
ret = groundHeight + m_controllingPrim.HoverHeight;
}
else
{
ret = waterHeight + m_controllingPrim.HoverHeight;
}
break;
}
return ret;
}
}
}