ParticleSystem.LightsModule.ratio

Description

Choose what proportion of particles will receive a dynamic light.

Use a value between 0 and 1, where 0 will apply lights to no particles, and 1 will apply lights to all particles.

no example available in JavaScript

using UnityEngine;
using System.Collections;

// For best results, use Deferred Rendering (see Camera settings)
public class ExampleClass : MonoBehaviour {

	private ParticleSystem ps;
	public Light light;		// Provide a light Prefab in the inspector
	public float hSliderValueRatio = 1.0f;
	public float hSliderValueMax = 1000.0f;
	public bool randomDistribution = true;

	void Start() {
		ps = GetComponent<ParticleSystem>();
		ps.transform.localRotation = Quaternion.Euler(0.0f, 0.0f, 45.0f);

		var shape = ps.shape;
		shape.shapeType = ParticleSystemShapeType.Circle;

		var lights = ps.lights;
		lights.enabled = true;
		lights.light = light;

		// plane to receive lights
		var plane = GameObject.CreatePrimitive(PrimitiveType.Plane);
		plane.transform.parent = ps.transform;
		plane.transform.localPosition = new Vector3(0.0f, 0.0f, 3.0f);
		plane.transform.localScale = new Vector3(20.0f, 20.0f, 20.0f);
		plane.transform.localRotation = Quaternion.Euler(-90.0f, 0.0f, 0.0f);

		var material = new Material(Shader.Find("Standard"));
		material.color = new Color(0.1f, 0.1f, 0.1f, 1.0f);
		plane.GetComponent<MeshRenderer>().material = material;
	}

	void Update() {
		var lights = ps.lights;
		lights.ratio = hSliderValueRatio;
		lights.maxLights = (int)hSliderValueMax;
		lights.useRandomDistribution = randomDistribution;
	}

	void OnGUI() {
		GUI.Label(new Rect(25, 40, 100, 30), "Ratio");
		GUI.Label(new Rect(25, 80, 100, 30), "Max Lights");

		hSliderValueRatio = GUI.HorizontalSlider(new Rect(95, 45, 100, 30), hSliderValueRatio, 0.0f, 1.0f);
		hSliderValueMax = GUI.HorizontalSlider(new Rect(95, 85, 100, 30), hSliderValueMax, 0.0f, 500.0f);

		randomDistribution = GUI.Toggle(new Rect(25, 125, 400, 30), randomDistribution, "Randomly assign Lights to Particles instead of evenly distributing them.");
	}
}