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