103 lines
3.3 KiB
C#
103 lines
3.3 KiB
C#
// --------------------------------------------------------------------------------------------------------------------
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// <copyright file="UxrLinearPath.cs" company="VRMADA">
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// Copyright (c) VRMADA, All rights reserved.
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// </copyright>
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// --------------------------------------------------------------------------------------------------------------------
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using System.Collections.Generic;
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using UnityEngine;
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namespace UltimateXR.Animation.Splines
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{
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/// <summary>
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/// Linear interpolation point sequence. It is used to interpolate linearly between a set of points.
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/// </summary>
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public class UxrLinearPath : UxrSpline
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{
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#region Public Overrides UxrSpline
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/// <summary>
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/// Does the object contain valid data in order to evaluate the path?
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/// </summary>
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public override bool HasValidData => _points != null && _points.Count > 1;
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/// <summary>
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/// Evaluates the path.
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/// </summary>
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/// <param name="t">Interpolation parameter [0.0f, 1.0f]</param>
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/// <param name="position">Interpolated point</param>
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/// <returns>Success or failure</returns>
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public override bool Evaluate(float t, out Vector3 position)
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{
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return Evaluate(t, out position, out float _);
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}
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#endregion
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#region Public Methods
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/// <summary>
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/// Creates a path. If <see cref="UxrSpline.UsePrecomputedSampleCount" /> > 0 it will also precompute samples in order
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/// to evaluate the path using arc-length parameter.
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/// </summary>
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/// <param name="points">Set of points defining the curve</param>
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/// <returns>Success or failure</returns>
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public bool Create(params Vector3[] points)
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{
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_points = new List<Vector3>(points);
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if (points.Length < 2)
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{
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return false;
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}
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ComputeArcLengthSamples();
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return true;
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}
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#endregion
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#region Private Methods
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/// <summary>
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/// Interpolates the path using linear interpolation.
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/// </summary>
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/// <param name="t">Interpolation parameter [0.0f, 1.0f]</param>
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/// <param name="position">Interpolated position</param>
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/// <param name="segmentLength">Length of the segment that this point belongs to</param>
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/// <returns>Success or failure</returns>
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private bool Evaluate(float t, out Vector3 position, out float segmentLength)
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{
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position = Vector3.zero;
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segmentLength = 0.0f;
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t = Mathf.Clamp01(t);
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// Compute the index of p1
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int indexA = Mathf.FloorToInt(t * (_points.Count - 1));
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float segmentT = t * (_points.Count - 1) - indexA;
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if (indexA >= _points.Count - 1)
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{
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indexA = _points.Count - 2;
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segmentT = 1.0f;
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}
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Vector3 p1 = _points[indexA];
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Vector3 p2 = _points[indexA + 1];
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segmentLength = Vector3.Distance(p1, p2);
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// Interpolate
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position = Vector3.Lerp(p1, p2, segmentT);
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return true;
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}
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#endregion
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#region Private Types & Data
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private List<Vector3> _points;
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#endregion
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}
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} |