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/**
* @author sunag / http://www.sunag.com.br/
*/
import { Vector3Node } from '../inputs/Vector3Node.js';
function VelocityNode( target, params ) {
Vector3Node.call( this );
this.params = {};
this.velocity = new THREE.Vector3();
this.setTarget( target );
this.setParams( params );
}
VelocityNode.prototype = Object.create( Vector3Node.prototype );
VelocityNode.prototype.constructor = VelocityNode;
VelocityNode.prototype.nodeType = "Velocity";
VelocityNode.prototype.getReadonly = function ( builder ) {
return false;
};
VelocityNode.prototype.setParams = function ( params ) {
switch ( this.params.type ) {
case "elastic":
delete this.moment;
delete this.speed;
delete this.springVelocity;
delete this.lastVelocity;
break;
}
this.params = params || {};
switch ( this.params.type ) {
case "elastic":
this.moment = new THREE.Vector3();
this.speed = new THREE.Vector3();
this.springVelocity = new THREE.Vector3();
this.lastVelocity = new THREE.Vector3();
break;
}
};
VelocityNode.prototype.setTarget = function ( target ) {
if ( this.target ) {
delete this.position;
delete this.oldPosition;
}
this.target = target;
if ( target ) {
this.position = target.getWorldPosition( this.position || new THREE.Vector3() );
this.oldPosition = this.position.clone();
}
};
VelocityNode.prototype.updateFrameVelocity = function ( frame ) {
if ( this.target ) {
this.position = this.target.getWorldPosition( this.position || new THREE.Vector3() );
this.velocity.subVectors( this.position, this.oldPosition );
this.oldPosition.copy( this.position );
}
};
VelocityNode.prototype.updateFrame = function ( frame ) {
this.updateFrameVelocity( frame );
switch ( this.params.type ) {
case "elastic":
// convert to real scale: 0 at 1 values
var deltaFps = frame.delta * ( this.params.fps || 60 );
var spring = Math.pow( this.params.spring, deltaFps ),
damping = Math.pow( this.params.damping, deltaFps );
// fix relative frame-rate
this.velocity.multiplyScalar( Math.exp( - this.params.damping * deltaFps ) );
// elastic
this.velocity.add( this.springVelocity );
this.velocity.add( this.speed.multiplyScalar( damping ).multiplyScalar( 1 - spring ) );
// speed
this.speed.subVectors( this.velocity, this.lastVelocity );
// spring velocity
this.springVelocity.add( this.speed );
this.springVelocity.multiplyScalar( spring );
// moment
this.moment.add( this.springVelocity );
// damping
this.moment.multiplyScalar( damping );
this.lastVelocity.copy( this.velocity );
this.value.copy( this.moment );
break;
default:
this.value.copy( this.velocity );
}
};
VelocityNode.prototype.copy = function ( source ) {
Vector3Node.prototype.copy.call( this, source );
if ( source.target ) object.setTarget( source.target );
object.setParams( source.params );
};
VelocityNode.prototype.toJSON = function ( meta ) {
var data = this.getJSONNode( meta );
if ( ! data ) {
data = this.createJSONNode( meta );
if ( this.target ) data.target = this.target.uuid;
// clone params
data.params = JSON.parse( JSON.stringify( this.params ) );
}
return data;
};
export { VelocityNode };
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