Converts a Vector3 to a Vector4.

Vector3s can be implicitly converted to Vector4 (w is set to zero in the result).

	function Start () {
		// Shader vectors are always Vector4s.
		// The value here is converted to a Vector4 from a Vector3.
		var value : Vector3 = Vector3.one;
		renderer.material.SetVector("_SomeVariable", value);
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Start() {
        Vector3 value = Vector3.one;
        renderer.material.SetVector("_SomeVariable", value);
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Start() as void:
		value as Vector3 = Vector3.one
		renderer.material.SetVector('_SomeVariable', value)