分享一份“D3DXVec3Project”矩阵转换的E源码

EX飞哥

C#源码：参考一：

```csharp
using System.Numerics;


public struct Vector3
{
    public float X, Y, Z;


    public Vector3(float x, float y, float z)
    {
        X = x;
        Y = y;
        Z = z;
    }


    public static Vector3 operator *(Vector3 vector, Matrix4x4 matrix)
    {
        return new Vector3(
            (vector.X * matrix.M11 + vector.Y * matrix.M21 + vector.Z * matrix.M31 + 1 * matrix.M41),
            (vector.X * matrix.M12 + vector.Y * matrix.M22 + vector.Z * matrix.M32 + 1 * matrix.M42),
            (vector.X * matrix.M13 + vector.Y * matrix.M23 + vector.Z * matrix.M33 + 1 * matrix.M43)
        );
    }
}


public struct Matrix4x4
{
    public float M11, M12, M13, M14;
    public float M21, M22, M23, M24;
    public float M31, M32, M33, M34;
    public float M41, M42, M43, M44;
   
    // Constructor and other methods would be defined here...
}


public class MatrixOperations
{
    public static Matrix4x4 Multiply(Matrix4x4 left, Matrix4x4 right)
    {
        return new Matrix4x4()
        {
            M11 = left.M11 * right.M11 + left.M12 * right.M21 + left.M13 * right.M31 + left.M14 * right.M41,
            M12 = left.M11 * right.M12 + left.M12 * right.M22 + left.M13 * right.M32 + left.M14 * right.M42,
            M13 = left.M11 * right.M13 + left.M12 * right.M23 + left.M13 * right.M33 + left.M14 * right.M43,
            M14 = left.M11 * right.M14 + left.M12 * right.M24 + left.M13 * right.M34 + left.M14 * right.M44,


            M21 = left.M21 * right.M11 + left.M22 * right.M21 + left.M23 * right.M31 + left.M24 * right.M41,
            M22 = left.M21 * right.M12 + left.M22 * right.M22 + left.M23 * right.M32 + left.M24 * right.M42,
            M23 = left.M21 * right.M13 + left.M22 * right.M23 + left.M23 * right.M33 + left.M24 * right.M43,
            M24 = left.M21 * right.M14 + left.M22 * right.M24 + left.M23 * right.M34 + left.M24 * right.M44,


            M31 = left.M31 * right.M11 + left.M32 * right.M21 + left.M33 * right.M31 + left.M34 * right.M41,
            M32 = left.M31 * right.M12 + left.M32 * right.M22 + left.M33 * right.M32 + left.M34 * right.M42,
            M33 = left.M31 * right.M13 + left.M32 * right.M23 + left.M33 * right.M33 + left.M34 * right.M43,
            M34 = left.M31 * right.M14 + left.M32 * right.M24 + left.M33 * right.M34 + left.M34 * right.M44,


            M41 = left.M41 * right.M11 + left.M42 * right.M21 + left.M43 * right.M31 + left.M44 * right.M41,
            M42 = left.M41 * right.M12 + left.M42 * right.M22 + left.M43 * right.M32 + left.M44 * right.M42,
            M43 = left.M41 * right.M13 + left.M42 * right.M23 + left.M43 * right.M33 + left.M44 * right.M43,
            M44 = left.M41 * right.M14 + left.M42 * right.M24 + left.M43 * right.M34 + left.M44 * right.M44,
        };
    }
}




    public static Vector3 ProjectPoint(Vector3 point, Matrix world, Matrix view, Matrix projection, int viewportWidth, int viewportHeight)
    {
        Matrix combinedMatrix = world * view * projection;
        Vector3 transformedPoint = point * combinedMatrix;

        // 透视除法
        float oneOverW = 1.0f / transformedPoint.Z;
        Vector3 screenPoint = new Vector3(
            transformedPoint.X * oneOverW,
            transformedPoint.Y * oneOverW,
            transformedPoint.Z * oneOverW
        );

        // 转换到视口坐标
        screenPoint.X = screenPoint.X * (viewportWidth / 2) + viewportWidth / 2;
        screenPoint.Y = -screenPoint.Y * (viewportHeight / 2) + viewportHeight / 2; // 注意Y轴的翻转

        return screenPoint;
    }
}
这里的`Vector3`和`Matrix4x4`结构体以及相关的运算符重载和方法都是简化的版本

E没有相对应的库只能构造一个`Vector3`和`Matrix4x4`类型两份C源码+一份E纯源码都在文件里哦

矩阵相乘  回帖查看密码送精币哦→qun398897142[/hide]




纯源码文件下载→[hide]源码密码： 易语言D3DXVec3Project运算纯源码.rar (21.47 KB, 下载次数: 8)

2024-6-19 22:07 上传

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EX飞哥

zss5312 发表于 2024-7-3 10:35
密码多少哦

qun398897142

zss5312

密码多少哦

xp555

这玩意 。。随便下载个源码，里面就有，，，，

cs潇潇

直接看懵了……