66 lines
3.3 KiB
JavaScript
66 lines
3.3 KiB
JavaScript
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CelestialBody.prototype.updateOrbitAndRotation = function (time) {
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// Calculate the orbit
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// The reference frame (X, Y, Z) is the center coordinate of
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// the object's parent body.
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var referenceFrameX = 0;
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var referenceFrameY = 0;
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var referenceFrameZ = 0;
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if (this.parent != null) {
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referenceFrameX = this.parent.getX();
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referenceFrameY = this.parent.getY();
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referenceFrameZ = this.parent.getZ();
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// Now this is only a naive way of calculating the orbit
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// Note that zOx is the orbit plane
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// x -> z y -> z z -> x
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//1.11version
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//r=a*(1-e^2)/(1+ecoswt)
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//x=rcoswt+c
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//y=rsinwt
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var r = this.orbit.semiMajorAxis * (1 - this.orbit.eccentricity * this.orbit.eccentricity) / (1 + this.orbit.eccentricity * Math.cos(10.0 * -time / this.orbit.period));
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var x = referenceFrameX + (r * Math.cos(10.0 * -time / this.orbit.period)) * Math.cos(this.orbit.inclination / 180.0 * Math.PI);
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var y = referenceFrameY + (r * Math.cos(10.0 * -time / this.orbit.period)) * Math.sin(this.orbit.inclination / 180.0 * Math.PI);
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var z = referenceFrameZ + r * Math.sin(10.0 * -time / this.orbit.period);
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if (this.isComet) {
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this.cometPivot.position.set(x, y, z);
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if (cometSet) {
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this.objectGroup.position.set(x, y, z);
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lastCometX = x;
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lastCometY = y;
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lastCometZ = z;
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cometSet = false;
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}
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var delta = clock.getDelta() * spawnerOptions.timeScale;
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tick += delta;
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if (tick < 0) tick = 0;
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if (delta > 0) {
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var distance = Math.sqrt(this.getX() * this.getX() + this.getY() * this.getY() + this.getZ() * this.getZ());
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var tailLength = cometParams["Length"] / distance;
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options.size = cometParams["Size"] / distance;
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this.particleSystem.color = new THREE.Color();
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options.position.x -= tailLength * x / Math.sqrt(x * x + y * y + z * z);
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options.position.y -= tailLength * y / Math.sqrt(x * x + y * y + z * z);
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options.position.z -= tailLength * z / Math.sqrt(x * x + y * y + z * z);
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// options.sizeRandomness = 2;
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for (var i = 0; i < spawnerOptions.spawnRate * delta; i++) {
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this.particleSystem.spawnParticle(options);
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}
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this.objectGroup.position.x += ( tailLength * x / Math.sqrt(x * x + y * y + z * z) );
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this.objectGroup.position.y += ( tailLength * y / Math.sqrt(x * x + y * y + z * z) );
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this.objectGroup.position.z += ( tailLength * z / Math.sqrt(x * x + y * y + z * z) );
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this.objectGroup.position.x += (x - lastCometX);
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this.objectGroup.position.y += (y - lastCometY);
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this.objectGroup.position.z += (z - lastCometZ);
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}
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this.particleSystem.update(tick);
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lastCometX = x;
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lastCometY = y;
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lastCometZ = z;
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} else {
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this.objectGroup.position.set(x, y, z);
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// self-rotation
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this.objectGroup.rotateOnAxis(new THREE.Vector3(0, 1, 0), 0.1 / this.rotation.period);
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}
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}
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};
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