jmonkeyengine/jme3-jbullet/src/main/java/com/jme3/bullet/objects/PhysicsRigidBody.java

/*
 * Copyright (c) 2009-2012 jMonkeyEngine
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'jMonkeyEngine' 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 COPYRIGHT OWNER OR
 * 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
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.jme3.bullet.objects;

import com.bulletphysics.collision.dispatch.CollisionFlags;
import com.bulletphysics.dynamics.RigidBody;
import com.bulletphysics.dynamics.RigidBodyConstructionInfo;
import com.bulletphysics.linearmath.Transform;
import com.jme3.bullet.PhysicsSpace;
import com.jme3.bullet.collision.PhysicsCollisionObject;
import com.jme3.bullet.collision.shapes.CollisionShape;
import com.jme3.bullet.collision.shapes.MeshCollisionShape;
import com.jme3.bullet.joints.PhysicsJoint;
import com.jme3.bullet.objects.infos.RigidBodyMotionState;
import com.jme3.bullet.util.Converter;
import com.jme3.export.InputCapsule;
import com.jme3.export.JmeExporter;
import com.jme3.export.JmeImporter;
import com.jme3.export.OutputCapsule;
import com.jme3.math.Matrix3f;
import com.jme3.math.Quaternion;
import com.jme3.math.Vector3f;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * <p>PhysicsRigidBody - Basic physics object</p>
 * @author normenhansen
 */
public class PhysicsRigidBody extends PhysicsCollisionObject {

    protected RigidBodyConstructionInfo constructionInfo;
    protected RigidBody rBody;
    protected RigidBodyMotionState motionState = new RigidBodyMotionState();
    protected float mass = 1.0f;
    protected boolean kinematic = false;
    protected javax.vecmath.Vector3f tempVec = new javax.vecmath.Vector3f();
    protected javax.vecmath.Vector3f tempVec2 = new javax.vecmath.Vector3f();
    protected Transform tempTrans = new Transform(new javax.vecmath.Matrix3f());
    protected javax.vecmath.Matrix3f tempMatrix = new javax.vecmath.Matrix3f();
    //TEMP VARIABLES
    protected javax.vecmath.Vector3f localInertia = new javax.vecmath.Vector3f();
    protected ArrayList<PhysicsJoint> joints = new ArrayList<PhysicsJoint>();

    public PhysicsRigidBody() {
    }

    /**
     * Creates a new PhysicsRigidBody with the supplied collision shape
     * @param shape
     */
    public PhysicsRigidBody(CollisionShape shape) {
        collisionShape = shape;
        rebuildRigidBody();
    }

    public PhysicsRigidBody(CollisionShape shape, float mass) {
        collisionShape = shape;
        this.mass = mass;
        rebuildRigidBody();
    }

    /**
     * Builds/rebuilds the phyiscs body when parameters have changed
     */
    protected void rebuildRigidBody() {
        boolean removed = false;
        if(collisionShape instanceof MeshCollisionShape && mass != 0){
            throw new IllegalStateException("Dynamic rigidbody can not have mesh collision shape!");
        }
        if (rBody != null) {
            if (rBody.isInWorld()) {
                PhysicsSpace.getPhysicsSpace().remove(this);
                removed = true;
            }
            rBody.destroy();
        }
        preRebuild();
        rBody = new RigidBody(constructionInfo);
        postRebuild();
        if (removed) {
            PhysicsSpace.getPhysicsSpace().add(this);
        }
    }

    protected void preRebuild() {
        collisionShape.calculateLocalInertia(mass, localInertia);
        if (constructionInfo == null) {
            constructionInfo = new RigidBodyConstructionInfo(mass, motionState, collisionShape.getCShape(), localInertia);
        } else {
            constructionInfo.mass = mass;
            constructionInfo.collisionShape = collisionShape.getCShape();
            constructionInfo.motionState = motionState;
        }
    }

    protected void postRebuild() {
        rBody.setUserPointer(this);
        if (mass == 0.0f) {
            rBody.setCollisionFlags(rBody.getCollisionFlags() | CollisionFlags.STATIC_OBJECT);
        } else {
            rBody.setCollisionFlags(rBody.getCollisionFlags() & ~CollisionFlags.STATIC_OBJECT);
        }
    }

    /**
     * @return the motionState
     */
    public RigidBodyMotionState getMotionState() {
        return motionState;
    }

    /**
     * Sets the physics object location
     * @param location the location of the actual physics object
     */
    public void setPhysicsLocation(Vector3f location) {
        rBody.getCenterOfMassTransform(tempTrans);
        Converter.convert(location, tempTrans.origin);
        rBody.setCenterOfMassTransform(tempTrans);
        motionState.setWorldTransform(tempTrans);
    }

    /**
     * Sets the physics object rotation
     * @param rotation the rotation of the actual physics object
     */
    public void setPhysicsRotation(Matrix3f rotation) {
        rBody.getCenterOfMassTransform(tempTrans);
        Converter.convert(rotation, tempTrans.basis);
        rBody.setCenterOfMassTransform(tempTrans);
        motionState.setWorldTransform(tempTrans);
    }

    /**
     * Sets the physics object rotation
     * @param rotation the rotation of the actual physics object
     */
    public void setPhysicsRotation(Quaternion rotation) {
        rBody.getCenterOfMassTransform(tempTrans);
        Converter.convert(rotation, tempTrans.basis);
        rBody.setCenterOfMassTransform(tempTrans);
        motionState.setWorldTransform(tempTrans);
    }

    /**
     * Gets the physics object location, instantiates a new Vector3f object
     */
    public Vector3f getPhysicsLocation() {
        return getPhysicsLocation(null);
    }

    /**
     * Gets the physics object rotation
     */
    public Matrix3f getPhysicsRotationMatrix() {
        return getPhysicsRotationMatrix(null);
    }

    /**
     * Gets the physics object location, no object instantiation
     * @param location the location of the actual physics object is stored in this Vector3f
     */
    public Vector3f getPhysicsLocation(Vector3f location) {
        if (location == null) {
            location = new Vector3f();
        }
        rBody.getCenterOfMassTransform(tempTrans);
        return Converter.convert(tempTrans.origin, location);
    }

    /**
     * Gets the physics object rotation as a matrix, no conversions and no object instantiation
     * @param rotation the rotation of the actual physics object is stored in this Matrix3f
     */
    public Matrix3f getPhysicsRotationMatrix(Matrix3f rotation) {
        if (rotation == null) {
            rotation = new Matrix3f();
        }
        rBody.getCenterOfMassTransform(tempTrans);
        return Converter.convert(tempTrans.basis, rotation);
    }

    /**
     * Gets the physics object rotation as a quaternion, converts the bullet Matrix3f value,
     * instantiates new object
     */
    public Quaternion getPhysicsRotation(){
        return getPhysicsRotation(null);
    }

    /**
     * Gets the physics object rotation as a quaternion, converts the bullet Matrix3f value
     * @param rotation the rotation of the actual physics object is stored in this Quaternion
     */
    public Quaternion getPhysicsRotation(Quaternion rotation){
        if (rotation == null) {
            rotation = new Quaternion();
        }
        rBody.getCenterOfMassTransform(tempTrans);
        return Converter.convert(tempTrans.basis, rotation);
    }

    /**
     * Gets the physics object location
     * @param location the location of the actual physics object is stored in this Vector3f
     */
    public Vector3f getInterpolatedPhysicsLocation(Vector3f location) {
        if (location == null) {
            location = new Vector3f();
        }
        rBody.getInterpolationWorldTransform(tempTrans);
        return Converter.convert(tempTrans.origin, location);
    }

    /**
     * Gets the physics object rotation
     * @param rotation the rotation of the actual physics object is stored in this Matrix3f
     */
    public Matrix3f getInterpolatedPhysicsRotation(Matrix3f rotation) {
        if (rotation == null) {
            rotation = new Matrix3f();
        }
        rBody.getInterpolationWorldTransform(tempTrans);
        return Converter.convert(tempTrans.basis, rotation);
    }

    /**
     * Sets the node to kinematic mode. in this mode the node is not affected by physics
     * but affects other physics objects. Its kinetic force is calculated by the amount
     * of movement it is exposed to and its weight.
     * @param kinematic
     */
    public void setKinematic(boolean kinematic) {
        this.kinematic = kinematic;
        if (kinematic) {
            rBody.setCollisionFlags(rBody.getCollisionFlags() | CollisionFlags.KINEMATIC_OBJECT);
            rBody.setActivationState(com.bulletphysics.collision.dispatch.CollisionObject.DISABLE_DEACTIVATION);
        } else {
            rBody.setCollisionFlags(rBody.getCollisionFlags() & ~CollisionFlags.KINEMATIC_OBJECT);
            rBody.setActivationState(com.bulletphysics.collision.dispatch.CollisionObject.ACTIVE_TAG);
        }
    }

    public boolean isKinematic() {
        return kinematic;
    }

    public void setCcdSweptSphereRadius(float radius) {
        rBody.setCcdSweptSphereRadius(radius);
    }

    /**
     * Sets the amount of motion that has to happen in one physics tick to trigger the continuous motion detection<br/>
     * This avoids the problem of fast objects moving through other objects, set to zero to disable (default)
     * @param threshold
     */
    public void setCcdMotionThreshold(float threshold) {
        rBody.setCcdMotionThreshold(threshold);
    }

    public float getCcdSweptSphereRadius() {
        return rBody.getCcdSweptSphereRadius();
    }

    public float getCcdMotionThreshold() {
        return rBody.getCcdMotionThreshold();
    }

    public float getCcdSquareMotionThreshold() {
        return rBody.getCcdSquareMotionThreshold();
    }

    public float getMass() {
        return mass;
    }

    /**
     * Sets the mass of this PhysicsRigidBody, objects with mass=0 are static.
     * @param mass
     */
    public void setMass(float mass) {
        this.mass = mass;
        if(collisionShape instanceof MeshCollisionShape && mass != 0){
            throw new IllegalStateException("Dynamic rigidbody can not have mesh collision shape!");
        }
        if (collisionShape != null) {
            collisionShape.calculateLocalInertia(mass, localInertia);
        }
        if (rBody != null) {
            rBody.setMassProps(mass, localInertia);
            if (mass == 0.0f) {
                rBody.setCollisionFlags(rBody.getCollisionFlags() | CollisionFlags.STATIC_OBJECT);
            } else {
                rBody.setCollisionFlags(rBody.getCollisionFlags() & ~CollisionFlags.STATIC_OBJECT);
            }
        }
    }

    public Vector3f getGravity() {
        return getGravity(null);
    }

    public Vector3f getGravity(Vector3f gravity) {
        if (gravity == null) {
            gravity = new Vector3f();
        }
        rBody.getGravity(tempVec);
        return Converter.convert(tempVec, gravity);
    }

    /**
     * Set the local gravity of this PhysicsRigidBody<br/>
     * Set this after adding the node to the PhysicsSpace,
     * the PhysicsSpace assigns its current gravity to the physics node when its added.
     * @param gravity the gravity vector to set
     */
    public void setGravity(Vector3f gravity) {
        rBody.setGravity(Converter.convert(gravity, tempVec));
    }

    public float getFriction() {
        return rBody.getFriction();
    }

    /**
     * Sets the friction of this physics object
     * @param friction the friction of this physics object
     */
    public void setFriction(float friction) {
        constructionInfo.friction = friction;
        rBody.setFriction(friction);
    }

    public void setDamping(float linearDamping, float angularDamping) {
        constructionInfo.linearDamping = linearDamping;
        constructionInfo.angularDamping = angularDamping;
        rBody.setDamping(linearDamping, angularDamping);
    }

    public void setLinearDamping(float linearDamping) {
        constructionInfo.linearDamping = linearDamping;
        rBody.setDamping(linearDamping, constructionInfo.angularDamping);
    }

    public void setAngularDamping(float angularDamping) {
        constructionInfo.angularDamping = angularDamping;
        rBody.setDamping(constructionInfo.linearDamping, angularDamping);
    }

    public float getLinearDamping() {
        return constructionInfo.linearDamping;
    }

    public float getAngularDamping() {
        return constructionInfo.angularDamping;
    }

    public float getRestitution() {
        return rBody.getRestitution();
    }

    /**
     * The "bouncyness" of the PhysicsRigidBody, best performance if restitution=0
     * @param restitution
     */
    public void setRestitution(float restitution) {
        constructionInfo.restitution = restitution;
        rBody.setRestitution(restitution);
    }

    /**
     * Get the current angular velocity of this PhysicsRigidBody
     * @return the current linear velocity
     */
    public Vector3f getAngularVelocity() {
        return Converter.convert(rBody.getAngularVelocity(tempVec));
    }

    /**
     * Get the current angular velocity of this PhysicsRigidBody
     * @param vec the vector to store the velocity in
     */
    public void getAngularVelocity(Vector3f vec) {
        Converter.convert(rBody.getAngularVelocity(tempVec), vec);
    }

    /**
     * Sets the angular velocity of this PhysicsRigidBody
     * @param vec the angular velocity of this PhysicsRigidBody
     */
    public void setAngularVelocity(Vector3f vec) {
        rBody.setAngularVelocity(Converter.convert(vec, tempVec));
        rBody.activate();
    }

    /**
     * Get the current linear velocity of this PhysicsRigidBody
     * @return the current linear velocity
     */
    public Vector3f getLinearVelocity() {
        return Converter.convert(rBody.getLinearVelocity(tempVec));
    }

    /**
     * Get the current linear velocity of this PhysicsRigidBody
     * @param vec the vector to store the velocity in
     */
    public void getLinearVelocity(Vector3f vec) {
        Converter.convert(rBody.getLinearVelocity(tempVec), vec);
    }

    /**
     * Sets the linear velocity of this PhysicsRigidBody
     * @param vec the linear velocity of this PhysicsRigidBody
     */
    public void setLinearVelocity(Vector3f vec) {
        rBody.setLinearVelocity(Converter.convert(vec, tempVec));
        rBody.activate();
    }

    /**
     * Apply a force to the PhysicsRigidBody, only applies force if the next physics update call
     * updates the physics space.<br>
     * To apply an impulse, use applyImpulse, use applyContinuousForce to apply continuous force.
     * @param force the force
     * @param location the location of the force
     */
    public void applyForce(final Vector3f force, final Vector3f location) {
        rBody.applyForce(Converter.convert(force, tempVec), Converter.convert(location, tempVec2));
        rBody.activate();
    }

    /**
     * Apply a force to the PhysicsRigidBody, only applies force if the next physics update call
     * updates the physics space.<br>
     * To apply an impulse, use applyImpulse.
     * 
     * @param force the force
     */
    public void applyCentralForce(final Vector3f force) {
        rBody.applyCentralForce(Converter.convert(force, tempVec));
        rBody.activate();
    }

    /**
     * Apply a force to the PhysicsRigidBody, only applies force if the next physics update call
     * updates the physics space.<br>
     * To apply an impulse, use applyImpulse.
     * 
     * @param torque the torque
     */
    public void applyTorque(final Vector3f torque) {
        rBody.applyTorque(Converter.convert(torque, tempVec));
        rBody.activate();
    }

    /**
     * Apply an impulse to the PhysicsRigidBody in the next physics update.
     * @param impulse applied impulse
     * @param rel_pos location relative to object
     */
    public void applyImpulse(final Vector3f impulse, final Vector3f rel_pos) {
        rBody.applyImpulse(Converter.convert(impulse, tempVec), Converter.convert(rel_pos, tempVec2));
        rBody.activate();
    }

    /**
     * Apply a torque impulse to the PhysicsRigidBody in the next physics update.
     * @param vec
     */
    public void applyTorqueImpulse(final Vector3f vec) {
        rBody.applyTorqueImpulse(Converter.convert(vec, tempVec));
        rBody.activate();
    }

    /**
     * Clear all forces from the PhysicsRigidBody
     * 
     */
    public void clearForces() {
        rBody.clearForces();
    }

    public void setCollisionShape(CollisionShape collisionShape) {
        super.setCollisionShape(collisionShape);
        if(collisionShape instanceof MeshCollisionShape && mass!=0){
            throw new IllegalStateException("Dynamic rigidbody can not have mesh collision shape!");
        }
        if (rBody == null) {
            rebuildRigidBody();
        } else {
            collisionShape.calculateLocalInertia(mass, localInertia);
            constructionInfo.collisionShape = collisionShape.getCShape();
            rBody.setCollisionShape(collisionShape.getCShape());
        }
    }

    /**
     * reactivates this PhysicsRigidBody when it has been deactivated because it was not moving
     */
    public void activate() {
        rBody.activate();
    }

    public boolean isActive() {
        return rBody.isActive();
    }

    /**
     * sets the sleeping thresholds, these define when the object gets deactivated
     * to save ressources. Low values keep the object active when it barely moves
     * @param linear the linear sleeping threshold
     * @param angular the angular sleeping threshold
     */
    public void setSleepingThresholds(float linear, float angular) {
        constructionInfo.linearSleepingThreshold = linear;
        constructionInfo.angularSleepingThreshold = angular;
        rBody.setSleepingThresholds(linear, angular);
    }

    public void setLinearSleepingThreshold(float linearSleepingThreshold) {
        constructionInfo.linearSleepingThreshold = linearSleepingThreshold;
        rBody.setSleepingThresholds(linearSleepingThreshold, constructionInfo.angularSleepingThreshold);
    }

    public void setAngularSleepingThreshold(float angularSleepingThreshold) {
        constructionInfo.angularSleepingThreshold = angularSleepingThreshold;
        rBody.setSleepingThresholds(constructionInfo.linearSleepingThreshold, angularSleepingThreshold);
    }

    public float getLinearSleepingThreshold() {
        return constructionInfo.linearSleepingThreshold;
    }

    public float getAngularSleepingThreshold() {
        return constructionInfo.angularSleepingThreshold;
    }

    public float getAngularFactor() {
        return rBody.getAngularFactor();
    }

    public void setAngularFactor(float factor) {
        rBody.setAngularFactor(factor);
    }

    /**
     * do not use manually, joints are added automatically
     */
    public void addJoint(PhysicsJoint joint) {
        if (!joints.contains(joint)) {
            joints.add(joint);
        }
    }

    /**
     * 
     */
    public void removeJoint(PhysicsJoint joint) {
        joints.remove(joint);
    }

    /**
     * Returns a list of connected joints. This list is only filled when
     * the PhysicsRigidBody is actually added to the physics space or loaded from disk.
     * @return list of active joints connected to this PhysicsRigidBody
     */
    public List<PhysicsJoint> getJoints() {
        return joints;
    }

    /**
     * used internally
     */
    public RigidBody getObjectId() {
        return rBody;
    }

    /**
     * destroys this PhysicsRigidBody and removes it from memory
     */
    public void destroy() {
        rBody.destroy();
    }

    @Override
    public void write(JmeExporter e) throws IOException {
        super.write(e);
        OutputCapsule capsule = e.getCapsule(this);

        capsule.write(getMass(), "mass", 1.0f);

        capsule.write(getGravity(), "gravity", Vector3f.ZERO);
        capsule.write(getFriction(), "friction", 0.5f);
        capsule.write(getRestitution(), "restitution", 0);
        capsule.write(getAngularFactor(), "angularFactor", 1);
        capsule.write(kinematic, "kinematic", false);

        capsule.write(constructionInfo.linearDamping, "linearDamping", 0);
        capsule.write(constructionInfo.angularDamping, "angularDamping", 0);
        capsule.write(constructionInfo.linearSleepingThreshold, "linearSleepingThreshold", 0.8f);
        capsule.write(constructionInfo.angularSleepingThreshold, "angularSleepingThreshold", 1.0f);

        capsule.write(getCcdMotionThreshold(), "ccdMotionThreshold", 0);
        capsule.write(getCcdSweptSphereRadius(), "ccdSweptSphereRadius", 0);

        capsule.write(getPhysicsLocation(new Vector3f()), "physicsLocation", new Vector3f());
        capsule.write(getPhysicsRotationMatrix(new Matrix3f()), "physicsRotation", new Matrix3f());

        capsule.writeSavableArrayList(joints, "joints", null);
    }

    @Override
    public void read(JmeImporter e) throws IOException {
        super.read(e);

        InputCapsule capsule = e.getCapsule(this);
        float mass = capsule.readFloat("mass", 1.0f);
        this.mass = mass;
        rebuildRigidBody();
        setGravity((Vector3f) capsule.readSavable("gravity", Vector3f.ZERO.clone()));
        setFriction(capsule.readFloat("friction", 0.5f));
        setKinematic(capsule.readBoolean("kinematic", false));

        setRestitution(capsule.readFloat("restitution", 0));
        setAngularFactor(capsule.readFloat("angularFactor", 1));
        setDamping(capsule.readFloat("linearDamping", 0), capsule.readFloat("angularDamping", 0));
        setSleepingThresholds(capsule.readFloat("linearSleepingThreshold", 0.8f), capsule.readFloat("angularSleepingThreshold", 1.0f));
        setCcdMotionThreshold(capsule.readFloat("ccdMotionThreshold", 0));
        setCcdSweptSphereRadius(capsule.readFloat("ccdSweptSphereRadius", 0));

        setPhysicsLocation((Vector3f) capsule.readSavable("physicsLocation", new Vector3f()));
        setPhysicsRotation((Matrix3f) capsule.readSavable("physicsRotation", new Matrix3f()));

        joints = capsule.readSavableArrayList("joints", null);
    }
}