@babylonjs/core
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Getting started? Play directly with the Babylon.js API using our [playground](https://playground.babylonjs.com/). It also contains a lot of samples to learn how to use it.
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JavaScript
import { RegisterClass } from "../../../../Misc/typeStore.js";
import { NodeParticleBlockConnectionPointTypes } from "../../Enums/nodeParticleBlockConnectionPointTypes.js";
import { NodeParticleBlock } from "../../nodeParticleBlock.js";
import { _ConnectAtTheEnd } from "../../../Queue/executionQueue.js";
import { Vector3 } from "../../../../Maths/math.vector.js";
const ToAttractor = Vector3.Zero();
const Force = Vector3.Zero();
const ScaledForce = Vector3.Zero();
/**
* Block used to update particle position based on an attractor
*/
export class UpdateAttractorBlock extends NodeParticleBlock {
/**
* Create a new UpdateAttractorBlock
* @param name defines the block name
*/
constructor(name) {
super(name);
this.registerInput("particle", NodeParticleBlockConnectionPointTypes.Particle);
this.registerInput("attractor", NodeParticleBlockConnectionPointTypes.Vector3, true, Vector3.Zero());
this.registerInput("strength", NodeParticleBlockConnectionPointTypes.Float, true, 1);
this.registerOutput("output", NodeParticleBlockConnectionPointTypes.Particle);
}
/**
* Gets the particle component
*/
get particle() {
return this._inputs[0];
}
/**
* Gets the attractor input component
*/
get attractor() {
return this._inputs[1];
}
/**
* Gets the strength input component
*/
get strength() {
return this._inputs[2];
}
/**
* Gets the output component
*/
get output() {
return this._outputs[0];
}
/**
* Gets the current class name
* @returns the class name
*/
getClassName() {
return "UpdateAttractorBlock";
}
/**
* Builds the block
* @param state defines the current build state
*/
_build(state) {
const system = this.particle.getConnectedValue(state);
const processAttractor = (particle) => {
const attractorPosition = this.attractor.getConnectedValue(state);
const strength = this.strength.getConnectedValue(state);
attractorPosition.subtractToRef(particle.position, ToAttractor);
const distanceSquared = ToAttractor.lengthSquared() + 1; // Avoid going under 1.0
ToAttractor.normalize().scaleToRef(strength / distanceSquared, Force);
Force.scaleToRef(system._tempScaledUpdateSpeed, ScaledForce);
particle.direction.addInPlace(ScaledForce); // Update particle velocity
};
const attractorProcessing = {
process: processAttractor,
previousItem: null,
nextItem: null,
};
if (system._updateQueueStart) {
_ConnectAtTheEnd(attractorProcessing, system._updateQueueStart);
}
else {
system._updateQueueStart = attractorProcessing;
}
this.output._storedValue = system;
}
}
RegisterClass("BABYLON.UpdateAttractorBlock", UpdateAttractorBlock);
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