CodeWalker/Utils/Matrices.cs

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2017-09-21 18:33:05 +08:00
using SharpDX;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace CodeWalker
{
public static class MatrixExtensions
{
public static Vector3 MultiplyW(this Matrix m, Vector3 v)
{
float x = (((m.M11 * v.X) + (m.M21 * v.Y)) + (m.M31 * v.Z)) + m.M41;
float y = (((m.M12 * v.X) + (m.M22 * v.Y)) + (m.M32 * v.Z)) + m.M42;
float z = (((m.M13 * v.X) + (m.M23 * v.Y)) + (m.M33 * v.Z)) + m.M43;
float w = (((m.M14 * v.X) + (m.M24 * v.Y)) + (m.M34 * v.Z)) + m.M44;
float iw = 1.0f / Math.Abs(w);
return new Vector3(x * iw, y * iw, z * iw);
}
public static Vector3 Multiply(this Matrix m, Vector3 v)
{
float x = (((m.M11 * v.X) + (m.M21 * v.Y)) + (m.M31 * v.Z)) + m.M41;
float y = (((m.M12 * v.X) + (m.M22 * v.Y)) + (m.M32 * v.Z)) + m.M42;
float z = (((m.M13 * v.X) + (m.M23 * v.Y)) + (m.M33 * v.Z)) + m.M43;
return new Vector3(x, y, z);
//this quick mul ignores W...
}
public static Vector4 Multiply(this Matrix m, Vector4 v)
{
float x = (((m.M11 * v.X) + (m.M21 * v.Y)) + (m.M31 * v.Z)) + m.M41;
float y = (((m.M12 * v.X) + (m.M22 * v.Y)) + (m.M32 * v.Z)) + m.M42;
float z = (((m.M13 * v.X) + (m.M23 * v.Y)) + (m.M33 * v.Z)) + m.M43;
float w = (((m.M14 * v.X) + (m.M24 * v.Y)) + (m.M34 * v.Z)) + m.M44;
return new Vector4(x, y, z, w);
}
}
}