@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 { RandomRange } from "../../../../Maths/math.scalar.functions.js";
import { RegisterClass } from "../../../../Misc/typeStore.js";
import { NodeParticleBlockConnectionPointTypes } from "../../Enums/nodeParticleBlockConnectionPointTypes.js";
import { NodeParticleBlock } from "../../nodeParticleBlock.js";
import { Vector3 } from "../../../../Maths/math.vector.js";
import { _CreateLocalPositionData } from "./emitters.functions.js";
/**
* Block used to provide a flow of particles emitted from a cylinder shape.
* DirectionRandomizer will be used for the particles initial direction unless both direction1 and direction2 are connected.
*/
export class CylinderShapeBlock extends NodeParticleBlock {
/**
* Create a new CylinderShapeBlock
* @param name defines the block name
*/
constructor(name) {
super(name);
this._tempVector = Vector3.Zero();
this.registerInput("particle", NodeParticleBlockConnectionPointTypes.Particle);
this.registerInput("radius", NodeParticleBlockConnectionPointTypes.Float, true, 1);
this.registerInput("height", NodeParticleBlockConnectionPointTypes.Float, true, 1, 0);
this.registerInput("radiusRange", NodeParticleBlockConnectionPointTypes.Float, true, 1, 0, 1);
this.registerInput("directionRandomizer", NodeParticleBlockConnectionPointTypes.Float, true, 0, 0, 1);
this.registerInput("direction1", NodeParticleBlockConnectionPointTypes.Vector3, true);
this.registerInput("direction2", NodeParticleBlockConnectionPointTypes.Vector3, true);
this.registerOutput("output", NodeParticleBlockConnectionPointTypes.Particle);
}
/**
* Gets the current class name
* @returns the class name
*/
getClassName() {
return "CylinderShapeBlock";
}
/**
* Gets the particle component
*/
get particle() {
return this._inputs[0];
}
/**
* Gets the radius input component
*/
get radius() {
return this._inputs[1];
}
/**
* Gets the height input component
*/
get height() {
return this._inputs[2];
}
/**
* Gets the radiusRange input component
*/
get radiusRange() {
return this._inputs[3];
}
/**
* Gets the directionRandomizer input component
*/
get directionRandomizer() {
return this._inputs[4];
}
/**
* Gets the direction1 input component
*/
get direction1() {
return this._inputs[5];
}
/**
* Gets the direction2 input component
*/
get direction2() {
return this._inputs[6];
}
/**
* Gets the output component
*/
get output() {
return this._outputs[0];
}
/**
* Builds the block
* @param state defines the build state
*/
_build(state) {
const system = this.particle.getConnectedValue(state);
system._directionCreation.process = (particle) => {
state.particleContext = particle;
state.systemContext = system;
// We always use directionRandomizer unless both directions are connected
if (this.direction1.isConnected === false || this.direction2.isConnected === false) {
const directionRandomizer = this.directionRandomizer.getConnectedValue(state);
particle.position.subtractToRef(state.emitterPosition, this._tempVector);
this._tempVector.normalize();
if (state.emitterInverseWorldMatrix) {
Vector3.TransformNormalToRef(this._tempVector, state.emitterInverseWorldMatrix, this._tempVector);
}
const randY = RandomRange(-directionRandomizer / 2, directionRandomizer / 2);
let angle = Math.atan2(this._tempVector.x, this._tempVector.z);
angle += RandomRange(-Math.PI / 2, Math.PI / 2) * directionRandomizer;
this._tempVector.y = randY; // set direction y to rand y to mirror normal of cylinder surface
this._tempVector.x = Math.sin(angle);
this._tempVector.z = Math.cos(angle);
this._tempVector.normalize();
if (system.isLocal) {
particle.direction.copyFrom(this._tempVector);
}
else {
Vector3.TransformNormalFromFloatsToRef(this._tempVector.x, this._tempVector.y, this._tempVector.z, state.emitterWorldMatrix, particle.direction);
}
}
else {
const direction1 = this.direction1.getConnectedValue(state);
const direction2 = this.direction2.getConnectedValue(state);
const randX = RandomRange(direction1.x, direction2.x);
const randY = RandomRange(direction1.y, direction2.y);
const randZ = RandomRange(direction1.z, direction2.z);
if (system.isLocal) {
particle.direction.copyFromFloats(randX, randY, randZ);
}
else {
Vector3.TransformNormalFromFloatsToRef(randX, randY, randZ, state.emitterWorldMatrix, particle.direction);
}
}
particle._properties.initialDirection = particle.direction.clone();
};
system._positionCreation.process = (particle) => {
state.particleContext = particle;
state.systemContext = system;
const height = this.height.getConnectedValue(state);
const radiusRange = this.radiusRange.getConnectedValue(state);
const radius = this.radius.getConnectedValue(state);
const yPos = RandomRange(-height / 2, height / 2);
const angle = RandomRange(0, 2 * Math.PI);
// Pick a properly distributed point within the circle https://programming.guide/random-point-within-circle.html
const radiusDistribution = RandomRange((1 - radiusRange) * (1 - radiusRange), 1);
const positionRadius = Math.sqrt(radiusDistribution) * radius;
const xPos = positionRadius * Math.cos(angle);
const zPos = positionRadius * Math.sin(angle);
if (system.isLocal) {
particle.position.copyFromFloats(xPos, yPos, zPos);
}
else {
Vector3.TransformCoordinatesFromFloatsToRef(xPos, yPos, zPos, state.emitterWorldMatrix, particle.position);
}
_CreateLocalPositionData(particle);
};
this.output._storedValue = system;
}
}
RegisterClass("BABYLON.CylinderShapeBlock", CylinderShapeBlock);
//# sourceMappingURL=cylinderShapeBlock.js.map