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using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
[Serializable]
public class Flare
{
public string Comment = "";
public bool IsActive = true;
public FlareAtlas Atlas; // flare atlas
public int Index; // flare texture
[MinMaxSlider(0.0f, 15f)]
public Vector2 ScaleRange;
public Color Color; // 颜色
[Range(0, 360)]
public float Rotation; // 初始的旋转值，即正对着阳光时的姿势
public bool RotateWith; // 随着视角变化，是否跟随转动
public bool OverridePixelPerUnit; //
public float PixelPerUnit;
[Range(-5, 10)]
public float Distance = 0; // 一个相对于光源的偏移距离
[HideInInspector]
public const float DistanceAmount = 10;
public float DistanceAspect
{
get
{
return Distance / DistanceAmount;
}
}
public FlareTexture Texture
{
get
{
if (Index < Atlas.SubTextures.Count)
return Atlas.SubTextures[Index];
return null;
}
}
}
// 光源
public class FlareSource : MonoBehaviour
{
[SerializeField] private Camera m_GameCamera;
[SerializeField] private Camera m_FlareCamera;
public float PixelPerUnit = 100; // 用来控制缩放，在flare space生成网格的大小依据
public AnimationCurve FadeCurve; // 淡入淡出的曲线
public float FadeDuration;// 淡入淡出的时间间隔
public AnimationCurve ScaleCurve;
public AnimationCurve AlphaCurve;
[Range(0.1f, 5)]
public float SpreadAmount = 5; // 总长度/光源到光晕中心的长度，用来求得总长度
public float SpreadMaximum = 5; // 最大扩散长度，单位Unit
public Vector2 Center;
[TextArea(1, 10)]
public string Comment;
public List<Flare> Flares;
private Vector3 m_ViewportPosition;
public Vector3 ViewportPosition
{
get
{
return m_ViewportPosition;
}
}
private float m_AlphaBase = 0f;
public float AlphaBase
{
get
{
return m_AlphaBase;
}
}
private float m_FadeTime = 0;
public bool IsVisible
{
get;private set;
}
private bool IsHitLast = true;
// Start is called before the first frame update
void Start()
{
IsHitLast = true;
IsVisible = false;
if (m_GameCamera == null)
m_GameCamera = Camera.main;
}
// Update is called once per frame
void Update()
{
Vector3 position = transform.position;
m_ViewportPosition = m_GameCamera.WorldToViewportPoint(position);
Ray ray = new Ray(m_GameCamera.transform.position, position - m_GameCamera.transform.position);
RaycastHit hit;
if(Physics.Raycast(ray, out hit))
{
if (IsVisible)
{
if (!IsHitLast)
m_FadeTime = (1 - m_AlphaBase) * FadeDuration;
m_FadeTime += Time.deltaTime;
float fac = GetFadeCurveValue(m_FadeTime / FadeDuration);
m_AlphaBase = Mathf.Lerp(1, 0, fac);
if (m_AlphaBase <= 0)
{
IsVisible = false;
m_FadeTime = 0;
m_AlphaBase = 0;
}
}
IsHitLast = true;
}
else
{
if(IsHitLast)
m_FadeTime = m_AlphaBase * FadeDuration;
if(m_AlphaBase < 1)
{
m_FadeTime += Time.deltaTime;
float fac = GetFadeCurveValue(m_FadeTime / FadeDuration);
m_AlphaBase = Mathf.Lerp(0, 1, fac);
if (m_AlphaBase >= 1)
{
m_FadeTime = 0;
m_AlphaBase = 1;
}
}
IsVisible = true;
IsHitLast = false;
}
Debug.DrawLine(transform.position, m_GameCamera.transform.position, IsHitLast ? Color.red : Color.white);
}
// 获取flare space下的初始大小，用来构建mesh
public Vector2 GetFlareSize(Flare flare)
{
Vector2 size = flare.Texture.PixelSize;
if(flare.OverridePixelPerUnit && flare.PixelPerUnit > 0)
{
size /= flare.PixelPerUnit;
}
else
{
size /= PixelPerUnit;
}
return size;
}
public float GetScaleCurveValue(float fac)
{
return ScaleCurve.Evaluate(fac);
}
public float GetAlphaCurveValue(float fac)
{
return AlphaCurve.Evaluate(fac);
}
public float GetFadeCurveValue(float fac)
{
return FadeCurve.Evaluate(fac);
}
}
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