ParticleSystemRenderer.cameraVelocityScale

Description

How much are the particles stretched depending on the Camera's speed.

Use this to make particles become large if the viewing camera has a large speed.

no example available in JavaScript

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {

	private ParticleSystem ps;
	private ParticleSystemRenderer psr;
	public ParticleSystemRenderMode renderMode = ParticleSystemRenderMode.Billboard;
	public float cameraScale = 0.0f;
	public float lengthScale = 0.0f;
	public float velocityScale = 1.0f;

	void Start() {

		ps = GetComponent<ParticleSystem>();
		psr = GetComponent<ParticleSystemRenderer>();

		psr.mesh = Resources.GetBuiltinResource<Mesh>("Capsule.fbx");

		var main = ps.main;
		main.startSpeed = new ParticleSystem.MinMaxCurve(0.5f, 1.5f);
		main.startSize = new ParticleSystem.MinMaxCurve(0.1f, 0.8f);
	}

	void Update() {
		psr.renderMode = renderMode;
		psr.cameraVelocityScale = cameraScale;
		psr.lengthScale = lengthScale;
		psr.velocityScale = velocityScale;

		if (renderMode == ParticleSystemRenderMode.Stretch)
			Camera.main.transform.position = new Vector3(Mathf.Sin(Time.time) * 4.0f, 0.0f, -10.0f);	// move the camera so we can see the effect on stretch camera velocity
	}

	void OnGUI() {
		renderMode = (ParticleSystemRenderMode)GUI.SelectionGrid(new Rect(25, 25, 900, 30), (int)renderMode, new GUIContent[] { new GUIContent("Billboard"), new GUIContent("Stretch"), new GUIContent("HorizontalBillboard"), new GUIContent("VerticalBillboard"), new GUIContent("Mesh"), new GUIContent("None") }, 6);

		if (renderMode == ParticleSystemRenderMode.Stretch) {

			GUI.Label(new Rect(25, 80, 100, 30), "Camera Scale");
			GUI.Label(new Rect(25, 120, 100, 30), "Length Scale");
			GUI.Label(new Rect(25, 160, 100, 30), "Velocity Scale");

			cameraScale = GUI.HorizontalSlider(new Rect(125, 85, 100, 30), cameraScale, 0.0f, 10.0f);
			lengthScale = GUI.HorizontalSlider(new Rect(125, 125, 100, 30), lengthScale, 0.0f, 10.0f);
			velocityScale = GUI.HorizontalSlider(new Rect(125, 165, 100, 30), velocityScale, 0.0f, 10.0f);
		}
	}
}