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March 10, 2020 03:38
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| using System.Collections; | |
| using System.Collections.Generic; | |
| using UnityEngine; | |
| [RequireComponent(typeof(LineRenderer))] | |
| public class Verlet : MonoBehaviour | |
| { | |
| class Point | |
| { | |
| public Point(Vector3 pos, Vector3 oldPos) | |
| { | |
| this.pos = pos; | |
| this.oldPos = oldPos; | |
| isFixed = false; | |
| } | |
| public bool isFixed; | |
| public Vector3 pos; | |
| public Vector3 oldPos; | |
| } | |
| class Stick | |
| { | |
| public Stick(Point p1, Point p2) | |
| { | |
| this.p1 = p1; | |
| this.p2 = p2; | |
| length = getDistance(); | |
| } | |
| public float getDistance() | |
| { | |
| return Vector3.Distance(p1.pos, p2.pos); | |
| } | |
| public float length; | |
| public Point p1; | |
| public Point p2; | |
| } | |
| [Header("Verlet Settings")] | |
| public int count = 10; | |
| public float stickLength = 0.05f; | |
| List<Point> points = new List<Point>(); | |
| List<Stick> sticks = new List<Stick>(); | |
| [Header("Physics")] | |
| public float noiseForce = 0.2f; | |
| public float friction = 0.99f; | |
| public bool isNoiseForce = true; | |
| public float gravityForce = -0.02f; | |
| Vector3 gravity; | |
| float seed = 0; | |
| [Header("Line")] | |
| public float lineWidth = 0.2f; | |
| LineRenderer line; | |
| void Start() | |
| { | |
| seed = Random.Range(0f, 1200f); | |
| line = GetComponent<LineRenderer>(); | |
| // same | |
| // S1 point S2 ... | |
| // Sticks +------+ | +------+ ... | |
| // Points p1 p2------p1 p2 ... | |
| for (int i = 0; i < count; i++) | |
| { | |
| if (i == 0) // first point | |
| { | |
| Point p = new Point(new Vector3(0, 0, 0), new Vector3(0, 0, 0)); | |
| p.isFixed = true; | |
| points.Add(p); | |
| } | |
| else | |
| { | |
| float pos = -i * 0.2f; | |
| Point p = new Point(new Vector3(0, pos + stickLength, 0), new Vector3(0, pos, 0)); | |
| points.Add(p); | |
| sticks.Add(new Stick(points[i - 1], points[i])); | |
| } | |
| } | |
| line.positionCount = count; | |
| line.startWidth = lineWidth; | |
| line.endWidth = 0; | |
| } | |
| void Update() | |
| { | |
| points[0].pos = transform.position; // link first point to obj pos | |
| UpdateForces(); | |
| UpdatePoints(); | |
| UpdateSticks(); | |
| } | |
| void UpdateForces() | |
| { | |
| if (isNoiseForce) | |
| { | |
| float x = Mathf.PerlinNoise(Time.time + seed, 0f) - 0.5f; | |
| float z = Mathf.PerlinNoise(Time.time + seed + 120f, 0f) - 0.5f; | |
| gravity = new Vector3(0, gravityForce, 0)*0.01f + new Vector3(x * noiseForce, 0, z * noiseForce)*0.01f; | |
| } | |
| } | |
| void UpdatePoints() | |
| { | |
| int i = 0; | |
| foreach (Point p in points) | |
| { | |
| if (!p.isFixed) | |
| { | |
| Vector3 vel = (p.pos - p.oldPos) * friction; | |
| p.oldPos = p.pos; | |
| p.pos += vel; | |
| p.pos += gravity; | |
| } | |
| line.SetPosition(i++, p.pos); | |
| } | |
| } | |
| void UpdateSticks() | |
| { | |
| foreach (Stick s in sticks) | |
| { | |
| Vector3 p1 = s.p2.pos - s.p1.pos; | |
| float dist = s.getDistance(); | |
| float diff = s.length - dist; | |
| float pct = diff / dist / 2.0f; | |
| Vector3 offset = p1 * pct; | |
| s.p1.pos -= offset; | |
| s.p2.pos += offset; | |
| } | |
| } | |
| } |
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