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Add target object to orbital camera. #75

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Merged
NSTCG merged 1 commit into from
Jul 11, 2025
Merged

Add target object to orbital camera. #75

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26 changes: 22 additions & 4 deletions orbital-camera.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import {Component} from '@wonderlandengine/api';
import {Component, Object3D} from '@wonderlandengine/api';
import {property} from '@wonderlandengine/api/decorators.js';
import {deg2rad, rad2deg} from './utils/utils.js';
import {quat, vec3} from 'gl-matrix';
Expand Down Expand Up @@ -52,8 +52,12 @@ export class OrbitalCamera extends Component {
@property.float(0.9)
damping = 0.9;

@property.object()
target: Object3D | null = null;

private _mouseDown: boolean = false;
private _origin = [0, 0, 0];
private _origin = vec3.create();
private _originCache = vec3.create();
private _azimuth = 0;
private _polar = 45;

Expand All @@ -65,7 +69,11 @@ export class OrbitalCamera extends Component {
private _polarSpeed: number = 0;

init() {
this.object.getPositionWorld(this._origin);
if (this.target) {
this.target.getPositionWorld(this._origin);
} else {
this.object.getPositionWorld(this._origin);
}
}

start(): void {
Expand Down Expand Up @@ -113,6 +121,11 @@ export class OrbitalCamera extends Component {
}

update(): void {
// Update the orbit center to the target's position if one is assigned.
if (this.target) {
this.target.getPositionWorld(this._origin);
}

/* Always apply damping, because there's no event for stop moving */
this._azimuthSpeed *= this.damping;
this._polarSpeed *= this.damping;
Expand All @@ -129,8 +142,13 @@ export class OrbitalCamera extends Component {
this._polar = Math.min(this.maxElevation, Math.max(this.minElevation, this._polar));

/* Update the camera if there's any speed */
if (this._azimuthSpeed !== 0 || this._polarSpeed !== 0) {
if (
this._azimuthSpeed !== 0 ||
this._polarSpeed !== 0 ||
vec3.equals(this._origin, this._originCache) === false
) {
this._updateCamera();
vec3.copy(this._originCache, this._origin);
}
}

Expand Down