73 lines
2.5 KiB
C#
73 lines
2.5 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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[System.Serializable]
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class StarBand
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{
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[SerializeField] public float proportion, fromXZ, toXZ, fromY, toY;
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}
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public class ScatterMyStars : MonoBehaviour
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{
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[SerializeField] ParticleSystem starsParticleSystem;
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[SerializeField] int starCount = 1000;
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[SerializeField] StarBand[] spreads;
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private ParticleSystem.Particle[] particles;
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private byte[] alphas;
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private Color32 color32;
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private float radius, spreadSum, spreadChooser, sum, angleXZ, angleY;
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private int chosenSpread;
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private Vector3 position;
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void Start()
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{
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alphas = new byte[starCount];
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particles = new ParticleSystem.Particle[starCount];
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starsParticleSystem.Emit(starCount);
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starsParticleSystem.GetParticles(particles, starCount, 0);
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radius = starsParticleSystem.shape.radius;
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spreadSum = 0f;
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foreach (StarBand spread in spreads)
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{
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spreadSum += spread.proportion;
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}
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for (int i = 0; i < particles.Length; i++)
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{
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alphas[i] = particles[i].startColor.a;
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spreadChooser = Random.Range(0f, spreadSum);
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sum = 0f;
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for (int ii = 0; ii < spreads.Length; ii++)
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{
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sum += spreads[ii].proportion;
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if (spreadChooser < sum)
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{
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chosenSpread = ii;
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ii = spreads.Length;
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}
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}
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angleXZ = Random.Range(Mathf.Deg2Rad * spreads[chosenSpread].fromXZ, Mathf.Deg2Rad * spreads[chosenSpread].toXZ);
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angleY = Random.Range(Mathf.Deg2Rad * spreads[chosenSpread].fromY, Mathf.Deg2Rad * spreads[chosenSpread].toY);
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position.x = radius * Mathf.Cos(angleXZ) * Mathf.Sin(angleY);
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position.z = radius * Mathf.Sin(angleXZ) * Mathf.Sin(angleY);
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position.y = radius * Mathf.Cos(angleY);
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particles[i].position = position;
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}
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starsParticleSystem.SetParticles(particles, starCount);
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}
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void Update()
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{
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for (int i = 0; i < particles.Length; i++)
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{
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color32 = particles[i].startColor;
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color32.a = (byte)Mathf.Clamp(alphas[i] * (starsParticleSystem.transform.TransformPoint(particles[i].position).y - starsParticleSystem.transform.position.y)
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/ radius, 0, alphas[i]);
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particles[i].startColor = color32;
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}
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starsParticleSystem.SetParticles(particles, particles.Length, 0);
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}
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} |