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using System;
using UnityEngine;
public class CloudGenerator : MonoBehaviour
{
public Sprite[] CloudImages;
private Vector2[][] UvCache;
private Vector2[] ExtentCache;
public int NumClouds = 500;
public float Length = 25f;
public float Width = 25f;
public Vector2 Direction = new Vector2(1f, 0f);
private Vector2 NormDir = new Vector2(1f, 0f);
private Vector2 Tangent = new Vector2(0f, 1f);
private float tanLen;
public FloatRange Rates = new FloatRange(0.25f, 1f);
[HideInInspector]
private CloudGenerator.Cloud[] stars;
[HideInInspector]
private Vector3[] verts;
[HideInInspector]
private Mesh mesh;
private struct Cloud
{
public int CloudIdx;
public float Rate;
public float PositionX;
public float PositionY;
}
public void Start()
{
this.UvCache = new Vector2[this.CloudImages.Length][];
this.ExtentCache = new Vector2[this.CloudImages.Length];
for (int i = 0; i < this.CloudImages.Length; i++)
{
Sprite sprite = this.CloudImages[i];
this.UvCache[i] = sprite.uv;
this.ExtentCache[i] = sprite.bounds.extents;
}
this.stars = new CloudGenerator.Cloud[this.NumClouds];
this.verts = new Vector3[this.NumClouds * 4];
Vector2[] array = new Vector2[this.NumClouds * 4];
int[] array2 = new int[this.NumClouds * 6];
this.SetDirection(this.Direction);
MeshFilter component = base.GetComponent<MeshFilter>();
this.mesh = new Mesh();
this.mesh.MarkDynamic();
component.mesh = this.mesh;
Vector3 vector = default(Vector3);
for (int j = 0; j < this.stars.Length; j++)
{
CloudGenerator.Cloud cloud = this.stars[j];
int num = cloud.CloudIdx = this.CloudImages.RandomIdx<Sprite>();
Vector2 vector2 = this.ExtentCache[num];
Vector2[] array3 = this.UvCache[num];
float num2 = FloatRange.Next(-1f, 1f) * this.Length;
float num3 = FloatRange.Next(-1f, 1f) * this.Width;
float num4 = cloud.PositionX = num2 * this.NormDir.x + num3 * this.Tangent.x;
float num5 = cloud.PositionY = num2 * this.NormDir.y + num3 * this.Tangent.y;
cloud.Rate = this.Rates.Next();
this.stars[j] = cloud;
int num6 = j * 4;
vector.x = num4 - vector2.x;
vector.y = num5 + vector2.y;
this.verts[num6] = vector;
vector.x = num4 + vector2.x;
this.verts[num6 + 1] = vector;
vector.x = num4 - vector2.x;
vector.y = num5 - vector2.y;
this.verts[num6 + 2] = vector;
vector.x = num4 + vector2.x;
this.verts[num6 + 3] = vector;
array[num6] = array3[0];
array[num6 + 1] = array3[1];
array[num6 + 2] = array3[2];
array[num6 + 3] = array3[3];
int num7 = j * 6;
array2[num7] = num6;
array2[num7 + 1] = num6 + 1;
array2[num7 + 2] = num6 + 2;
array2[num7 + 3] = num6 + 2;
array2[num7 + 4] = num6 + 1;
array2[num7 + 5] = num6 + 3;
}
this.mesh.vertices = this.verts;
this.mesh.uv = array;
this.mesh.SetIndices(array2, MeshTopology.Triangles, 0);
}
private void FixedUpdate()
{
float num = -0.99f * this.Length;
Vector2 vector = this.Direction * Time.fixedDeltaTime;
Vector3 vector2 = default(Vector3);
for (int i = 0; i < this.stars.Length; i++)
{
int num2 = i * 4;
CloudGenerator.Cloud cloud = this.stars[i];
float num3 = cloud.PositionX;
float num4 = cloud.PositionY;
Vector2 vector3 = this.ExtentCache[cloud.CloudIdx];
float rate = cloud.Rate;
num3 += rate * vector.x;
num4 += rate * vector.y;
if (this.OrthoDistance(num3, num4) > this.Length)
{
float num5 = FloatRange.Next(-1f, 1f) * this.Width;
num3 = num * this.NormDir.x + num5 * this.Tangent.x;
num4 = num * this.NormDir.y + num5 * this.Tangent.y;
cloud.Rate = this.Rates.Next();
}
cloud.PositionX = num3;
cloud.PositionY = num4;
this.stars[i] = cloud;
vector2.x = num3 - vector3.x;
vector2.y = num4 + vector3.y;
this.verts[num2] = vector2;
vector2.x = num3 + vector3.x;
this.verts[num2 + 1] = vector2;
vector2.x = num3 - vector3.x;
vector2.y = num4 - vector3.y;
this.verts[num2 + 2] = vector2;
vector2.x = num3 + vector3.x;
this.verts[num2 + 3] = vector2;
}
this.mesh.vertices = this.verts;
}
public void SetDirection(Vector2 dir)
{
this.Direction = dir;
this.NormDir = this.Direction.normalized;
this.Tangent = new Vector2(-this.NormDir.y, this.NormDir.x);
this.tanLen = Mathf.Sqrt(this.Tangent.y * this.Tangent.y + this.Tangent.x * this.Tangent.x);
}
private float OrthoDistance(float pointx, float pointy)
{
return (this.Tangent.y * pointx - this.Tangent.x * pointy) / this.tanLen;
}
}
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