116 lines
4.0 KiB
C#
116 lines
4.0 KiB
C#
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#region License
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/*
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MIT License
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Copyright(c) 2017 Mattias Edlund
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#endregion
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using System;
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using System.Runtime.CompilerServices;
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namespace UnityMeshSimplifier
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{
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/// <summary>
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/// Math helpers.
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/// </summary>
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public static class MathHelper
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{
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#region Consts
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/// <summary>
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/// The Pi constant.
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/// </summary>
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public const float PI = 3.14159274f;
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/// <summary>
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/// The Pi constant.
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/// </summary>
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public const double PId = 3.1415926535897932384626433832795;
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/// <summary>
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/// Degrees to radian constant.
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/// </summary>
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public const float Deg2Rad = PI / 180f;
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/// <summary>
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/// Degrees to radian constant.
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/// </summary>
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public const double Deg2Radd = PId / 180.0;
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/// <summary>
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/// Radians to degrees constant.
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/// </summary>
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public const float Rad2Deg = 180f / PI;
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/// <summary>
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/// Radians to degrees constant.
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/// </summary>
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public const double Rad2Degd = 180.0 / PId;
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#endregion
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#region Min
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/// <summary>
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/// Returns the minimum of three values.
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/// </summary>
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/// <param name="val1">The first value.</param>
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/// <param name="val2">The second value.</param>
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/// <param name="val3">The third value.</param>
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/// <returns>The minimum value.</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static double Min(double val1, double val2, double val3)
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{
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return (val1 < val2 ? (val1 < val3 ? val1 : val3) : (val2 < val3 ? val2 : val3));
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}
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#endregion
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#region Clamping
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/// <summary>
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/// Clamps a value between a minimum and a maximum value.
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/// </summary>
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/// <param name="value">The value to clamp.</param>
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/// <param name="min">The minimum value.</param>
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/// <param name="max">The maximum value.</param>
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/// <returns>The clamped value.</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static double Clamp(double value, double min, double max)
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{
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return (value >= min ? (value <= max ? value : max) : min);
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}
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#endregion
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#region Triangle Area
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/// <summary>
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/// Calculates the area of a triangle.
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/// </summary>
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/// <param name="p0">The first point.</param>
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/// <param name="p1">The second point.</param>
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/// <param name="p2">The third point.</param>
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/// <returns>The triangle area.</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static double TriangleArea(ref Vector3d p0, ref Vector3d p1, ref Vector3d p2)
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{
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var dx = p1 - p0;
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var dy = p2 - p0;
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return dx.Magnitude * (Math.Sin(Vector3d.Angle(ref dx, ref dy) * Deg2Radd) * dy.Magnitude) * 0.5f;
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}
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#endregion
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}
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}
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