File size: 2,402 Bytes
40c0886 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | using UnityEngine;
namespace UnityAgent
{
/// <summary>
/// Rotates a directional light around the world to simulate a day/night
/// cycle. Also lerps between day and night sky/ambient colors and turns
/// street lights on after sunset.
/// </summary>
public class DayNightCycle : MonoBehaviour
{
[Header("Sun")]
public Light sun;
public float dayLengthSeconds = 120f;
[Header("Colors")]
public Color daySky = new Color(0.5f, 0.7f, 1.0f);
public Color nightSky = new Color(0.03f, 0.04f, 0.08f);
public Color dayAmbient = new Color(0.6f, 0.6f, 0.6f);
public Color nightAmbient = new Color(0.12f, 0.13f, 0.18f);
[Header("Lights")]
public Light[] streetLights;
public float streetLightThreshold = 0.2f;
private float _timeOfDay; // 0..1
private void Start()
{
if (sun == null) sun = GetComponent<Light>();
RenderSettings.ambientMode = UnityEngine.Rendering.AmbientMode.Flat;
}
private void Update()
{
_timeOfDay = (_timeOfDay + Time.deltaTime / dayLengthSeconds) % 1f;
// Sun angle: at timeOfDay=0.25 sun is at noon.
float sunAngle = (_timeOfDay - 0.25f) * 360f;
if (sun != null)
{
sun.transform.rotation = Quaternion.Euler(sunAngle, -30f, 0f);
float dayFactor = Mathf.Clamp01(Mathf.Cos((_timeOfDay - 0.25f) * Mathf.PI * 2f) * 0.5f + 0.5f);
sun.intensity = dayFactor * 1.2f;
}
float t = Mathf.Clamp01(Mathf.Cos((_timeOfDay - 0.25f) * Mathf.PI * 2f) * 0.5f + 0.5f);
RenderSettings.ambientLight = Color.Lerp(nightAmbient, dayAmbient, t);
Camera mainCam = Camera.main;
if (mainCam != null)
{
mainCam.backgroundColor = Color.Lerp(nightSky, daySky, t);
}
UpdateStreetLights(t);
}
private void UpdateStreetLights(float dayFactor)
{
if (streetLights == null) return;
bool on = dayFactor < streetLightThreshold;
foreach (var l in streetLights)
if (l != null) l.enabled = on;
}
/// <summary>Current time of day in 0..1 range (0=midnight).</summary>
public float TimeOfDay => _timeOfDay;
}
}
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