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170 lines
2.8 KiB
170 lines
2.8 KiB
import { Vector3 } from '../../../../build/three.module.js';
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import { Vector3Node } from '../inputs/Vector3Node.js';
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class VelocityNode extends Vector3Node {
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constructor( target, params ) {
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super();
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this.params = {};
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this.velocity = new Vector3();
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this.setTarget( target );
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this.setParams( params );
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}
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getReadonly( /*builder*/ ) {
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return false;
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}
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setParams( params ) {
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switch ( this.params.type ) {
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case 'elastic':
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delete this.moment;
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delete this.speed;
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delete this.springVelocity;
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delete this.lastVelocity;
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break;
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}
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this.params = params || {};
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switch ( this.params.type ) {
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case 'elastic':
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this.moment = new Vector3();
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this.speed = new Vector3();
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this.springVelocity = new Vector3();
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this.lastVelocity = new Vector3();
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break;
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}
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}
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setTarget( target ) {
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if ( this.target ) {
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delete this.position;
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delete this.oldPosition;
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}
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this.target = target;
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if ( target ) {
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this.position = target.getWorldPosition( this.position || new Vector3() );
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this.oldPosition = this.position.clone();
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}
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}
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updateFrameVelocity( /*frame*/ ) {
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if ( this.target ) {
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this.position = this.target.getWorldPosition( this.position || new Vector3() );
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this.velocity.subVectors( this.position, this.oldPosition );
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this.oldPosition.copy( this.position );
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}
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}
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updateFrame( frame ) {
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this.updateFrameVelocity( frame );
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switch ( this.params.type ) {
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case 'elastic':
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// convert to real scale: 0 at 1 values
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const deltaFps = frame.delta * ( this.params.fps || 60 );
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const spring = Math.pow( this.params.spring, deltaFps ),
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damping = Math.pow( this.params.damping, deltaFps );
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// fix relative frame-rate
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this.velocity.multiplyScalar( Math.exp( - this.params.damping * deltaFps ) );
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// elastic
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this.velocity.add( this.springVelocity );
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this.velocity.add( this.speed.multiplyScalar( damping ).multiplyScalar( 1 - spring ) );
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// speed
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this.speed.subVectors( this.velocity, this.lastVelocity );
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// spring velocity
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this.springVelocity.add( this.speed );
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this.springVelocity.multiplyScalar( spring );
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// moment
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this.moment.add( this.springVelocity );
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// damping
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this.moment.multiplyScalar( damping );
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this.lastVelocity.copy( this.velocity );
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this.value.copy( this.moment );
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break;
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default:
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this.value.copy( this.velocity );
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}
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}
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copy( source ) {
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super.copy( source );
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if ( source.target ) this.setTarget( source.target );
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this.setParams( source.params );
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return this;
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}
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toJSON( meta ) {
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const data = super.toJSON( meta );
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if ( this.target ) data.target = this.target.uuid;
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// clone params
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data.params = JSON.parse( JSON.stringify( this.params ) );
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return data;
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}
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}
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VelocityNode.prototype.nodeType = 'Velocity';
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export { VelocityNode };
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