52 lines
1.5 KiB
JavaScript
52 lines
1.5 KiB
JavaScript
import {MathUtils, Object3D, Vector3} from "three";
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export class Marker extends Object3D {
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/**
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* @param markerId {string}
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*/
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constructor(markerId) {
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super();
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Object.defineProperty(this, 'isMarker', {value: true});
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this.markerId = markerId;
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this.markerType = "marker";
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}
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dispose() {};
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/**
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* Updates this marker from the provided data object, usually parsed form json from a markers.json
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* @param markerData {object}
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*/
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updateFromData(markerData) {}
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// -- helper methods --
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static _posRelativeToCamera = new Vector3();
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static _cameraDirection = new Vector3();
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/**
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* @param position {Vector3}
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* @param camera {THREE.Camera}
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* @param fadeDistanceMax {number}
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* @param fadeDistanceMin {number}
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* @returns {number} - opacity between 0 and 1
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*/
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static calculateDistanceOpacity(position, camera, fadeDistanceMin, fadeDistanceMax) {
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//calculate "orthographic distance" to marker
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Marker._posRelativeToCamera.subVectors(position, camera.position);
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camera.getWorldDirection(Marker._cameraDirection);
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let distance = Marker._posRelativeToCamera.dot(Marker._cameraDirection);
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//calculate opacity based on (min/max)distance
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let minDelta = (distance - fadeDistanceMin) / fadeDistanceMin;
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let maxDelta = (distance - fadeDistanceMax) / (fadeDistanceMax * 0.5);
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return Math.min(
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MathUtils.clamp(minDelta, 0, 1),
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1 - MathUtils.clamp(maxDelta + 1, 0, 1)
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);
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}
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} |