68 lines
1.3 KiB
C#
68 lines
1.3 KiB
C#
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using System;
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using UnityEngine;
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[Serializable]
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public struct CubicBezier3
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{
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public Vector3 a;
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public Vector3 b;
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public Vector3 c;
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public Vector3 d;
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public Vector3 p0 => a;
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public Vector3 p1 => d;
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public Vector3 v0 => b - a;
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public Vector3 v1 => c - d;
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public static CubicBezier3 FromVelocities(Vector3 p0, Vector3 v0, Vector3 p1, Vector3 v1)
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{
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CubicBezier3 result = default(CubicBezier3);
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result.a = p0;
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result.b = p0 + v0;
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result.c = p1 + v1;
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result.d = p1;
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return result;
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}
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public Vector3 Evaluate(float t)
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{
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float num = t * t;
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float num2 = num * t;
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return a + 3f * t * (b - a) + 3f * num * (c - 2f * b + a) + num2 * (d - 3f * c + 3f * b - a);
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}
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public void ToVertices(Vector3[] results)
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{
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ToVertices(results, 0, results.Length);
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}
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public void ToVertices(Vector3[] results, int spanStart, int spanLength)
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{
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float num = 1f / (float)(spanLength - 1);
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for (int i = 0; i < spanLength; i++)
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{
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results[spanStart++] = Evaluate((float)i * num);
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}
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}
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public float ApproximateLength(int samples)
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{
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float num = 1f / (float)(samples - 1);
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float num2 = 0f;
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Vector3 vector = p0;
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for (int i = 1; i < samples; i++)
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{
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Vector3 vector2 = Evaluate((float)i * num);
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num2 += Vector3.Distance(vector, vector2);
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vector = vector2;
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}
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return num2;
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}
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}
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