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using System;
using UnityEngine;
[RequireComponent(typeof(MeshFilter))]
[RequireComponent(typeof(MeshRenderer))]
public class StarGen : MonoBehaviour
{
private const float MaxStarRadius = 0.05f;
public int NumStars = 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 StarGen.Stars[] stars;
[HideInInspector]
private Vector3[] verts;
[HideInInspector]
private Mesh mesh;
[Serializable]
private struct Stars
{
public float Size;
public float Rate;
public float PositionX;
public float PositionY;
}
public void Start()
{
this.stars = new StarGen.Stars[this.NumStars];
this.verts = new Vector3[this.NumStars * 4];
Vector2[] array = new Vector2[this.NumStars * 4];
int[] array2 = new int[this.NumStars * 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);
Vector2 vector2 = default(Vector2);
for (int i = 0; i < this.stars.Length; i++)
{
StarGen.Stars stars = this.stars[i];
float num = FloatRange.Next(-1f, 1f) * this.Length;
float num2 = FloatRange.Next(-1f, 1f) * this.Width;
float num3 = stars.PositionX = num * this.NormDir.x + num2 * this.Tangent.x;
float num4 = stars.PositionY = num * this.NormDir.y + num2 * this.Tangent.y;
float num5 = FloatRange.Next(0.01f, 0.05f);
stars.Size = num5;
stars.Rate = this.Rates.Next();
this.stars[i] = stars;
int num6 = i * 4;
vector.x = num3 - num5;
vector.y = num4 + num5;
this.verts[num6] = vector;
vector.y = num4 - num5;
this.verts[num6 + 1] = vector;
vector.x = num3 + num5;
this.verts[num6 + 2] = vector;
vector.y = num4 + num5;
this.verts[num6 + 3] = vector;
vector2.x = -1f;
vector2.y = 1f;
array[num6] = vector2;
vector2.y = -1f;
array[num6 + 1] = vector2;
vector2.x = 1f;
array[num6 + 2] = vector2;
vector2.y = 1f;
array[num6 + 3] = vector2;
int num7 = i * 6;
array2[num7] = num6;
array2[num7 + 1] = num6 + 1;
array2[num7 + 2] = num6 + 2;
array2[num7 + 3] = num6 + 2;
array2[num7 + 4] = num6;
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;
for (int i = 0; i < this.stars.Length; i++)
{
StarGen.Stars stars = this.stars[i];
float size = stars.Size;
float num2 = stars.PositionX;
float num3 = stars.PositionY;
float num4 = stars.Rate * (size / 0.05f);
num2 += num4 * vector.x;
num3 += num4 * vector.y;
if (this.OrthoDistance(num2, num3) > this.Length)
{
float num5 = FloatRange.Next(-1f, 1f) * this.Width;
num2 = num * this.NormDir.x + num5 * this.Tangent.x;
num3 = num * this.NormDir.y + num5 * this.Tangent.y;
this.stars[i].Rate = this.Rates.Next();
}
stars.PositionX = num2;
stars.PositionY = num3;
this.stars[i] = stars;
int num6 = i * 4;
float x = num2 - size;
float x2 = num2 + size;
float y = num3 + size;
float y2 = num3 - size;
this.verts[num6].x = x;
this.verts[num6].y = y;
this.verts[num6 + 1].x = x;
this.verts[num6 + 1].y = y2;
this.verts[num6 + 2].x = x2;
this.verts[num6 + 2].y = y2;
this.verts[num6 + 3].x = x2;
this.verts[num6 + 3].y = y;
}
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);
}
public void RegenPositions()
{
if (this.stars == null)
{
return;
}
for (int i = 0; i < this.stars.Length; i++)
{
float num = FloatRange.Next(-1f, 1f) * this.Length;
float num2 = FloatRange.Next(-1f, 1f) * this.Width;
this.stars[i].PositionX = num * this.NormDir.x + num2 * this.Tangent.x;
this.stars[i].PositionY = num * this.NormDir.y + num2 * this.Tangent.y;
}
}
private float OrthoDistance(float pointx, float pointy)
{
return (this.Tangent.y * pointx - this.Tangent.x * pointy) / this.tanLen;
}
}
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