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//
// Extensions.cs
//
// Author:
// Jean-Philippe Bruyère <jp.bruyere@hotmail.com>
//
// Copyright (c) 2017 jp
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
using System;
using OpenTK;
using Crow;
namespace Crow
{
public static class Extensions {
public static Vector4 ToVector4(this Color c){
float[] f = c.floatArray;
return new Vector4 (f [0], f [1], f [2], f [3]);
}
public static Vector3 Transform(this Vector3 v, Matrix4 m){
return Vector4.Transform(new Vector4(v, 1), m).Xyz;
}
public static bool IsInBetween(this int v, int min, int max){
return v >= min & v <= max;
}
public static Vector4 UnProject(ref Matrix4 projection, ref Matrix4 view, int[] viewport, Vector2 mouse)
{
Vector4 vec;
vec.X = 2.0f * mouse.X / (float)viewport[2] - 1;
vec.Y = -(2.0f * mouse.Y / (float)viewport[3] - 1);
vec.Z = 0f;
vec.W = 1.0f;
Matrix4 viewInv = Matrix4.Invert(view);
Matrix4 projInv = Matrix4.Invert(projection);
Vector4.Transform(ref vec, ref projInv, out vec);
Vector4.Transform(ref vec, ref viewInv, out vec);
if (vec.W > float.Epsilon || vec.W < float.Epsilon)
{
vec.X /= vec.W;
vec.Y /= vec.W;
vec.Z /= vec.W;
}
return vec;
}
}
}
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