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using System.Linq;
using UnityEngine;
namespace Assets.MoveableLineRenderer.Scripts
{
internal sealed class MoveableLineRenderer : MonoBehaviour
{
public GameObject LineRendererPrefab;
public float MinVertexDistance = 1f;
public float LifeTime = 0.3f;
public float Scale = 1.0f;
public float Speed = 1f;
public float Height = 1f;
public float Gravity;
private LineRenderer _lineRenderer;
private Point[] _points;
private int _pointsCount;
private void Start()
{
_lineRenderer = Instantiate(LineRendererPrefab).GetComponent<LineRenderer>();
_lineRenderer.enabled = true;
_lineRenderer.transform.parent = transform;
_points = new Point[100];
}
private void Update()
{
RemoveOutdatedPoints();
if (_pointsCount == 0)
{
_points[_pointsCount++] = new Point(transform.position);
_points[_pointsCount++] = new Point(transform.position);
}
bool needAdd = false;
var sqrDistance = (_points[1].Position - transform.position).sqrMagnitude;
if (sqrDistance > MinVertexDistance * MinVertexDistance)
{
if (sqrDistance > MinVertexDistance * MinVertexDistance)
needAdd = true;
}
if (needAdd)
{
if (_pointsCount == _points.Length)
System.Array.Resize(ref _points, _points.Length + 50);
InsertPoint();
}
ApplyTurbulence();
_lineRenderer.positionCount = _pointsCount;
//todo
_lineRenderer.SetPositions(_points.Where(t => t != null).Select(t => t.Position).ToArray());
}
private void InsertPoint()
{
for (int i = _pointsCount; i > 0; i--)
_points[i] = _points[i - 1];
_points[0] = new Point(transform.position);
_pointsCount++;
}
private void RemoveOutdatedPoints()
{
if (_pointsCount == 0)
return;
for (int i = _pointsCount - 1; i >= 0; i--)
{
var point = _points[i];
if (point == null || point.TimeAlive >= LifeTime)
{
_points[i] = null;
_pointsCount--;
}
}
}
private void ApplyTurbulence()
{
for (int i = _pointsCount - 1; i >= 0; i--)
{
if (_points[i] == null)
continue;
var sTime = Time.timeSinceLevelLoad * Speed;
var pointPosition = _points[i].Position;
float xCoord = pointPosition.x * Scale + sTime;
float yCoord = pointPosition.y * Scale + sTime;
float zCoord = pointPosition.z * Scale + sTime;
_points[i].Position.x += (Mathf.PerlinNoise(yCoord, zCoord) - 0.5f) * Height;
_points[i].Position.y += (Mathf.PerlinNoise(xCoord, zCoord) - 0.5f) * Height - Gravity;
_points[i].Position.z += (Mathf.PerlinNoise(xCoord, yCoord) - 0.5f) * Height;
}
}
}
}
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