396 lines
17 KiB
C#
396 lines
17 KiB
C#
|
/// ---------------------------------------------
|
|||
|
|
/// Ultimate Character Controller
|
|||
|
|
/// Copyright (c) Opsive. All Rights Reserved.
|
|||
|
|
/// https://www.opsive.com
|
|||
|
|
/// ---------------------------------------------
|
|||
|
|
|
|||
|
|
namespace Opsive.UltimateCharacterController.Objects.ItemAssist
|
|||
|
|
{
|
|||
|
|
using Opsive.Shared.Game;
|
|||
|
|
using System.Collections.Generic;
|
|||
|
|
using UnityEngine;
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Builds a mesh which can show a trail following a melee weapon. This is typically used when the melee weapon is slashed.
|
|||
|
|
/// </summary>
|
|||
|
|
public class Trail : MonoBehaviour
|
|||
|
|
{
|
|||
|
|
[Tooltip("The minimum distance between the position of the last slice and the current position.")]
|
|||
|
|
[SerializeField] protected float m_MinDistance = 0.01f;
|
|||
|
|
[Tooltip("The vertical length of the trail.")]
|
|||
|
|
[SerializeField] protected float m_Length = 1f;
|
|||
|
|
[Tooltip("The maximum number of slices within the trail. A larger value will cause the trail to be longer.")]
|
|||
|
|
[SerializeField] protected int m_MaxSliceCount = 50;
|
|||
|
|
[Tooltip("The smoothing value of the curve. A larger value will have a smoother curve compared to a smaller value.")]
|
|||
|
|
[SerializeField] protected int m_CurveSmoothness = 10;
|
|||
|
|
[Tooltip("The steepness of the curve. A value closer to 1 will increase the steepness.")]
|
|||
|
|
[Range(0, 1)] [SerializeField] protected float m_CurveSteepness = 0.5f;
|
|||
|
|
[Tooltip("The start color of the trail, near the melee weapon object.")]
|
|||
|
|
[SerializeField] protected Color m_StartColor = Color.white;
|
|||
|
|
[Tooltip("The end color of the trail.")]
|
|||
|
|
[SerializeField] protected Color m_EndColor = Color.white;
|
|||
|
|
[Tooltip("The amount of time the slice should be visible.")]
|
|||
|
|
[SerializeField] protected float m_VisibilityTime = 1;
|
|||
|
|
|
|||
|
|
private GameObject m_GameObject;
|
|||
|
|
private Transform m_Transform;
|
|||
|
|
private Mesh m_Mesh;
|
|||
|
|
|
|||
|
|
private float m_MinDistanceSquared;
|
|||
|
|
private TrailSlice[] m_TrailSlices = new TrailSlice[4];
|
|||
|
|
private int m_TrailSlicesIndex = -1;
|
|||
|
|
private int m_TrailSlicesCount;
|
|||
|
|
|
|||
|
|
private TrailSlice[] m_SmoothedTrailSlices;
|
|||
|
|
private int m_SmoothedTrailSlicesIndex = -1;
|
|||
|
|
private int m_SmoothedTrailSlicesCount;
|
|||
|
|
|
|||
|
|
private int m_SmoothedTrailSlicesPrevCount;
|
|||
|
|
private int m_SmoothedTrailSlicesPrevIndex;
|
|||
|
|
|
|||
|
|
private List<Vector3> m_Vertices;
|
|||
|
|
private List<Vector2> m_UVs;
|
|||
|
|
private List<Color> m_Colors;
|
|||
|
|
private List<int> m_Triangles;
|
|||
|
|
|
|||
|
|
private bool m_GenerateSlices;
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// A small container class for each object that represents a slice from the melee trail.
|
|||
|
|
/// </summary>
|
|||
|
|
private struct TrailSlice
|
|||
|
|
{
|
|||
|
|
private Vector3 m_Point;
|
|||
|
|
private Vector3 m_Up;
|
|||
|
|
private float m_Time;
|
|||
|
|
|
|||
|
|
public Vector3 Point { get { return m_Point; } }
|
|||
|
|
public Vector3 Up { get { return m_Up; } }
|
|||
|
|
public float Time { get { return m_Time; } }
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Initializes the slice.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="point">The position of the slice.</param>
|
|||
|
|
/// <param name="up">The up direction of the slice.</param>
|
|||
|
|
public void Initialize(Vector3 point, Vector3 up)
|
|||
|
|
{
|
|||
|
|
m_Point = point;
|
|||
|
|
m_Up = up;
|
|||
|
|
m_Time = UnityEngine.Time.time;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Initializes the trail.
|
|||
|
|
/// </summary>
|
|||
|
|
private void Awake()
|
|||
|
|
{
|
|||
|
|
m_GameObject = gameObject;
|
|||
|
|
m_Transform = transform;
|
|||
|
|
|
|||
|
|
var meshFilter = GetComponent<MeshFilter>();
|
|||
|
|
if (meshFilter == null) {
|
|||
|
|
Debug.LogError("Error: Unable to find the MeshFilter component. Enssure the Trail object has been created through the Object Manager.");
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
m_Mesh = meshFilter.mesh;
|
|||
|
|
|
|||
|
|
m_MinDistanceSquared = m_MinDistance * m_MinDistance;
|
|||
|
|
var count = m_MaxSliceCount * m_CurveSmoothness;
|
|||
|
|
m_SmoothedTrailSlices = new TrailSlice[count];
|
|||
|
|
|
|||
|
|
m_Vertices = new List<Vector3>(count * 2);
|
|||
|
|
m_UVs = new List<Vector2>(count * 2);
|
|||
|
|
m_Colors = new List<Color>(count * 2);
|
|||
|
|
m_Triangles = new List<int>((count - 1) * 6); // 3 indices per triangle, 2 triangles per slice.
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Start to generate the trail slices.
|
|||
|
|
/// </summary>
|
|||
|
|
private void OnEnable()
|
|||
|
|
{
|
|||
|
|
m_GenerateSlices = true;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Samples the position of the melee object.
|
|||
|
|
/// </summary>
|
|||
|
|
private void FixedUpdate()
|
|||
|
|
{
|
|||
|
|
if (m_GenerateSlices) {
|
|||
|
|
SampleTrail();
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Displays the trail.
|
|||
|
|
/// </summary>
|
|||
|
|
private void LateUpdate()
|
|||
|
|
{
|
|||
|
|
RemoveOldSlices();
|
|||
|
|
BuildMesh();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Stores a new sample of the trail slice.
|
|||
|
|
/// </summary>
|
|||
|
|
private void SampleTrail()
|
|||
|
|
{
|
|||
|
|
// Add a new slice if the last sample position is too far away.
|
|||
|
|
if (m_TrailSlicesCount == 0 || (m_TrailSlices[m_TrailSlicesIndex].Point - m_Transform.position).sqrMagnitude > m_MinDistanceSquared) {
|
|||
|
|
// Revert the trail slice index and smoothed index/count values so the extra slice can be removed. A more accurate slice value will replace the prediction.
|
|||
|
|
if (m_TrailSlicesCount > 3) {
|
|||
|
|
m_TrailSlicesIndex = m_TrailSlicesIndex - 1;
|
|||
|
|
if (m_TrailSlicesIndex < 0) {
|
|||
|
|
m_TrailSlicesIndex += m_TrailSlicesCount;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
m_SmoothedTrailSlicesIndex = m_SmoothedTrailSlicesPrevIndex;
|
|||
|
|
m_SmoothedTrailSlicesCount = m_SmoothedTrailSlicesPrevCount;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Add the new slice at the current position.
|
|||
|
|
AddTrailSlice(m_Transform.position, m_Transform.up);
|
|||
|
|
|
|||
|
|
// A catmull-rom curve smooths the middle two verticies rather then all four vertices. Add one more slice near the beginning of the trail so the start of the
|
|||
|
|
// curve will intersect with the melee object.
|
|||
|
|
if (m_TrailSlicesCount > 3) {
|
|||
|
|
var prevIndex = m_TrailSlicesIndex - 1;
|
|||
|
|
if (prevIndex < 0) {
|
|||
|
|
prevIndex = m_TrailSlicesCount - 1;
|
|||
|
|
}
|
|||
|
|
var prevTrailSlice = m_TrailSlices[prevIndex];
|
|||
|
|
var trailSlice = m_TrailSlices[m_TrailSlicesIndex];
|
|||
|
|
|
|||
|
|
// Remember the previous smoothed values so the extra slice can be removed.
|
|||
|
|
m_SmoothedTrailSlicesPrevIndex = m_SmoothedTrailSlicesIndex;
|
|||
|
|
m_SmoothedTrailSlicesPrevCount = m_SmoothedTrailSlicesCount;
|
|||
|
|
// The new slice should be in the previous to the current slice position. This value probably won't be correct the next frame unless
|
|||
|
|
// the object is moving in a linear path but it is a good prediction.
|
|||
|
|
AddTrailSlice(trailSlice.Point + (trailSlice.Point - prevTrailSlice.Point).normalized, (trailSlice.Up + prevTrailSlice.Up) / 2);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Adds the point and up vertex to the trail slices array. The values will also be smoothed.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="point">The point of the slice.</param>
|
|||
|
|
/// <param name="up">The up direction of the slice.</param>
|
|||
|
|
private void AddTrailSlice(Vector3 point, Vector3 up)
|
|||
|
|
{
|
|||
|
|
// Catmull-rom curves do not like repeated points.
|
|||
|
|
if (m_TrailSlicesCount > 0 && m_TrailSlices[m_TrailSlicesIndex].Point == point) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
m_TrailSlicesIndex = (m_TrailSlicesIndex + 1) % m_TrailSlices.Length;
|
|||
|
|
m_TrailSlices[m_TrailSlicesIndex].Initialize(point, up);
|
|||
|
|
if (m_TrailSlicesIndex + 1 > m_TrailSlicesCount) {
|
|||
|
|
m_TrailSlicesCount++;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
SmoothTrailSlice();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Smooths the trail slices with a catmull-rom curve.
|
|||
|
|
/// </summary>
|
|||
|
|
private void SmoothTrailSlice()
|
|||
|
|
{
|
|||
|
|
// A catmull-rom curve requires at least four points.
|
|||
|
|
if (m_TrailSlicesCount < 4) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// A fixed size array is used to store the vertex values. The starting index may not be at the beginning of the array.
|
|||
|
|
var startIndex = m_TrailSlicesIndex - m_TrailSlicesCount + 1;
|
|||
|
|
if (startIndex < 0) {
|
|||
|
|
startIndex = m_TrailSlices.Length + startIndex;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Determine a smoothed value for both the point and up vertex.
|
|||
|
|
var p0 = m_TrailSlices[startIndex].Point;
|
|||
|
|
var p1 = m_TrailSlices[(startIndex + 1) % 4].Point;
|
|||
|
|
var p2 = m_TrailSlices[(startIndex + 2) % 4].Point;
|
|||
|
|
var p3 = m_TrailSlices[(startIndex + 3) % 4].Point;
|
|||
|
|
|
|||
|
|
var u0 = m_TrailSlices[startIndex].Up;
|
|||
|
|
var u1 = m_TrailSlices[(startIndex + 1) % 4].Up;
|
|||
|
|
var u2 = m_TrailSlices[(startIndex + 2) % 4].Up;
|
|||
|
|
var u3 = m_TrailSlices[(startIndex + 3) % 4].Up;
|
|||
|
|
|
|||
|
|
var t1 = CentripetralCatmullRomTime(0, p0, p1);
|
|||
|
|
var t2 = CentripetralCatmullRomTime(t1, p1, p2);
|
|||
|
|
var t3 = CentripetralCatmullRomTime(t2, p2, p3);
|
|||
|
|
|
|||
|
|
// Iterate based on the number of sample values.
|
|||
|
|
var iterAmount = ((t2 - t1) / m_CurveSmoothness);
|
|||
|
|
for (float t = t1; t < t2; t += iterAmount) {
|
|||
|
|
var point = CentripetralCatmullRomValue(p0, p1, p2, p3, 0, t1, t2, t3, t);
|
|||
|
|
var up = CentripetralCatmullRomValue(u0, u1, u2, u3, 0, t1, t2, t3, t);
|
|||
|
|
|
|||
|
|
// The value has been determined. Add it to the smoothed array.
|
|||
|
|
m_SmoothedTrailSlicesIndex = (m_SmoothedTrailSlicesIndex + 1) % m_SmoothedTrailSlices.Length;
|
|||
|
|
m_SmoothedTrailSlices[m_SmoothedTrailSlicesIndex].Initialize(point, up);
|
|||
|
|
if (m_SmoothedTrailSlicesIndex + 1 > m_SmoothedTrailSlicesCount) {
|
|||
|
|
m_SmoothedTrailSlicesCount++;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Returns the time of the centripetral catmull-rom curve, defined in https://en.wikipedia.org/wiki/Centripetal_Catmull–Rom_spline.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="t">The sample time.</param>
|
|||
|
|
/// <param name="v0">The first vertex.</param>
|
|||
|
|
/// <param name="v1">The second vertex.</param>
|
|||
|
|
/// <returns>The time of the centripetral catmull-rom curve.</returns>
|
|||
|
|
private float CentripetralCatmullRomTime(float t, Vector3 v0, Vector3 v1)
|
|||
|
|
{
|
|||
|
|
var a = Mathf.Pow((v1.x - v0.x), 2f) + Mathf.Pow((v1.y - v0.y), 2f) + Mathf.Pow((v1.z - v0.z), 2f);
|
|||
|
|
var b = Mathf.Pow(a, 0.5f);
|
|||
|
|
var c = Mathf.Pow(b, m_CurveSteepness);
|
|||
|
|
|
|||
|
|
return c + t;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Returns the vertex of the centripetral catmull-rom curve, defined in https://en.wikipedia.org/wiki/Centripetal_Catmull–Rom_spline.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <returns>The vertex of the centripetral catmull-rom curve.</returns>
|
|||
|
|
private Vector3 CentripetralCatmullRomValue(Vector3 v0, Vector3 v1, Vector3 v2, Vector3 v3, float t0, float t1, float t2, float t3, float t)
|
|||
|
|
{
|
|||
|
|
var a1 = (t1 - t) / (t1 - t0) * v0 + (t - t0) / (t1 - t0) * v1;
|
|||
|
|
var a2 = (t2 - t) / (t2 - t1) * v1 + (t - t1) / (t2 - t1) * v2;
|
|||
|
|
var a3 = (t3 - t) / (t3 - t2) * v2 + (t - t2) / (t3 - t2) * v3;
|
|||
|
|
var b1 = (t2 - t) / (t2 - t0) * a1 + (t - t0) / (t2 - t0) * a2;
|
|||
|
|
var b2 = (t3 - t) / (t3 - t1) * a2 + (t - t1) / (t3 - t1) * a3;
|
|||
|
|
return (t2 - t) / (t2 - t1) * b1 + (t - t1) / (t2 - t1) * b2;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Removes any slices which have existed for more than the visible time.
|
|||
|
|
/// </summary>
|
|||
|
|
private void RemoveOldSlices()
|
|||
|
|
{
|
|||
|
|
if (m_TrailSlicesCount == 0) {
|
|||
|
|
if (!m_GenerateSlices) {
|
|||
|
|
if (ObjectPool.InstantiatedWithPool(m_GameObject)) {
|
|||
|
|
ObjectPool.Destroy(m_GameObject);
|
|||
|
|
} else {
|
|||
|
|
m_GameObject.SetActive(false);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
var startIndex = m_TrailSlicesIndex - m_TrailSlicesCount + 1;
|
|||
|
|
if (startIndex < 0) {
|
|||
|
|
startIndex = m_TrailSlices.Length + startIndex;
|
|||
|
|
}
|
|||
|
|
var count = m_TrailSlicesCount;
|
|||
|
|
for (int i = 0; i < count; ++i) {
|
|||
|
|
var trailSlice = m_TrailSlices[(startIndex + i) % m_TrailSlices.Length];
|
|||
|
|
if (trailSlice.Time + m_VisibilityTime > Time.time) {
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// The slice has existed for more than the visiblity time - remove it by decreasing the count.
|
|||
|
|
m_TrailSlicesCount--;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (m_SmoothedTrailSlicesCount == 0) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
startIndex = m_SmoothedTrailSlicesIndex - m_SmoothedTrailSlicesCount + 1;
|
|||
|
|
if (startIndex < 0) {
|
|||
|
|
startIndex = m_SmoothedTrailSlices.Length + startIndex;
|
|||
|
|
}
|
|||
|
|
count = m_SmoothedTrailSlicesCount;
|
|||
|
|
for (int i = 0; i < count; ++i) {
|
|||
|
|
var trailSlice = m_SmoothedTrailSlices[(startIndex + i) % m_SmoothedTrailSlices.Length];
|
|||
|
|
if (trailSlice.Time + m_VisibilityTime > Time.time) {
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// The slice has existed for more than the visiblity time - remove it by decreasing the count.
|
|||
|
|
m_SmoothedTrailSlicesCount--;
|
|||
|
|
m_SmoothedTrailSlicesPrevCount--;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (m_TrailSlicesCount == 0 && m_SmoothedTrailSlicesCount == 0) {
|
|||
|
|
m_GenerateSlices = false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Creates the mesh from the catmull rom verticies.
|
|||
|
|
/// </summary>
|
|||
|
|
private void BuildMesh()
|
|||
|
|
{
|
|||
|
|
m_Mesh.Clear();
|
|||
|
|
|
|||
|
|
if (m_TrailSlicesCount < 4) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// A fixed size array is used to store the vertex values. The starting index may not be at the beginning of the array.
|
|||
|
|
var startIndex = m_SmoothedTrailSlicesIndex - m_SmoothedTrailSlicesCount + 1;
|
|||
|
|
if (startIndex < 0) {
|
|||
|
|
startIndex = m_SmoothedTrailSlices.Length + startIndex;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
m_Vertices.Clear();
|
|||
|
|
m_UVs.Clear();
|
|||
|
|
m_Colors.Clear();
|
|||
|
|
m_Triangles.Clear();
|
|||
|
|
|
|||
|
|
for (int i = 0; i < m_SmoothedTrailSlicesCount; ++i) {
|
|||
|
|
var trailSlice = m_SmoothedTrailSlices[(startIndex + i) % m_SmoothedTrailSlices.Length];
|
|||
|
|
// The vertex position is the local position of the slice point. This will allow the trail to stay in the same position while the melee object is moving.
|
|||
|
|
m_Vertices.Add(m_Transform.InverseTransformPoint(trailSlice.Point));
|
|||
|
|
m_Vertices.Add(m_Transform.InverseTransformPoint(trailSlice.Point + trailSlice.Up * m_Length));
|
|||
|
|
// Set the UV value so a texture can be applied to the material.
|
|||
|
|
var u = Mathf.Max(i / (float)(m_SmoothedTrailSlicesCount - 1), 0.01f);
|
|||
|
|
m_UVs.Add(new Vector2(u, 0));
|
|||
|
|
m_UVs.Add(new Vector2(u, 1));
|
|||
|
|
// Optionally lerp between the start and end color.
|
|||
|
|
m_Colors.Add(Color.Lerp(m_EndColor, m_StartColor, u));
|
|||
|
|
// A clear color will fade the trail at the bottom.
|
|||
|
|
m_Colors.Add(Color.clear);
|
|||
|
|
|
|||
|
|
// Map the triangle indices to the vertex element.
|
|||
|
|
if (i < m_SmoothedTrailSlicesCount - 1) {
|
|||
|
|
// First triangle.
|
|||
|
|
m_Triangles.Add((i * 2));
|
|||
|
|
m_Triangles.Add((i * 2) + 1);
|
|||
|
|
m_Triangles.Add((i * 2) + 2);
|
|||
|
|
|
|||
|
|
// Second triangle.
|
|||
|
|
m_Triangles.Add((i * 2) + 2);
|
|||
|
|
m_Triangles.Add((i * 2) + 1);
|
|||
|
|
m_Triangles.Add((i * 2) + 3);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Assign the values so the mesh will be displayed on the screen. The list version is used to prevent allocations when the mesh changes size.
|
|||
|
|
m_Mesh.SetVertices(m_Vertices);
|
|||
|
|
m_Mesh.SetUVs(0, m_UVs);
|
|||
|
|
m_Mesh.SetColors(m_Colors);
|
|||
|
|
m_Mesh.SetTriangles(m_Triangles, 0);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Stops generating the trail.
|
|||
|
|
/// </summary>
|
|||
|
|
public void StopGeneration()
|
|||
|
|
{
|
|||
|
|
m_Transform.parent = null;
|
|||
|
|
m_GenerateSlices = false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|