收一份D3DXVec3Project算法

恒浩

要求纯算法不依赖D3DXVec3Project 火山或者易语言的
企鹅977189077 加我时备注g海 天价勿扰


联系我时，请说是在 挂海论坛 上看到的，谢谢！

private

答应我，别当冤种了好吗
https://github.com/wine-mirror/wine/blob/90103fa07e5c23c7500c7d33e538b0610bf3c27d/dlls/d3dx9_36/math.c#L1828

[C++] 纯文本查看 复制代码

#ifdef NONAMELESSUNION
# define D3DX_U(x)  (x).u
#else
# define D3DX_U(x)  (x)
#endif

static inline D3DXMATRIX* D3DXMatrixIdentity(D3DXMATRIX *pout)
{
    if ( !pout ) return NULL;
    D3DX_U(*pout).m[0][1] = 0.0f;
    D3DX_U(*pout).m[0][2] = 0.0f;
    D3DX_U(*pout).m[0][3] = 0.0f;
    D3DX_U(*pout).m[1][0] = 0.0f;
    D3DX_U(*pout).m[1][2] = 0.0f;
    D3DX_U(*pout).m[1][3] = 0.0f;
    D3DX_U(*pout).m[2][0] = 0.0f;
    D3DX_U(*pout).m[2][1] = 0.0f;
    D3DX_U(*pout).m[2][3] = 0.0f;
    D3DX_U(*pout).m[3][0] = 0.0f;
    D3DX_U(*pout).m[3][1] = 0.0f;
    D3DX_U(*pout).m[3][2] = 0.0f;
    D3DX_U(*pout).m[0][0] = 1.0f;
    D3DX_U(*pout).m[1][1] = 1.0f;
    D3DX_U(*pout).m[2][2] = 1.0f;
    D3DX_U(*pout).m[3][3] = 1.0f;
    return pout;
}

D3DXMATRIX* WINAPI D3DXMatrixMultiply(D3DXMATRIX *pout, const D3DXMATRIX *pm1, const D3DXMATRIX *pm2)
{
    D3DXMATRIX out;
    int i,j;

    //TRACE("pout %p, pm1 %p, pm2 %p\n", pout, pm1, pm2);

    for (i=0; i<4; i++)
    {
        for (j=0; j<4; j++)
        {
            out.m[i][j] = pm1->m[i][0] * pm2->m[0][j] + pm1->m[i][1] * pm2->m[1][j] + pm1->m[i][2] * pm2->m[2][j] + pm1->m[i][3] * pm2->m[3][j];
        }
    }

    *pout = out;
    return pout;
}

D3DXVECTOR3* WINAPI D3DXVec3TransformCoord(D3DXVECTOR3 *pout, const D3DXVECTOR3 *pv, const D3DXMATRIX *pm)
{
    D3DXVECTOR3 out;
    FLOAT norm;

    //TRACE("pout %p, pv %p, pm %p\n", pout, pv, pm);

    norm = pm->m[0][3] * pv->x + pm->m[1][3] * pv->y + pm->m[2][3] *pv->z + pm->m[3][3];

    out.x = (pm->m[0][0] * pv->x + pm->m[1][0] * pv->y + pm->m[2][0] * pv->z + pm->m[3][0]) / norm;
    out.y = (pm->m[0][1] * pv->x + pm->m[1][1] * pv->y + pm->m[2][1] * pv->z + pm->m[3][1]) / norm;
    out.z = (pm->m[0][2] * pv->x + pm->m[1][2] * pv->y + pm->m[2][2] * pv->z + pm->m[3][2]) / norm;

    *pout = out;

    return pout;
}

D3DXVECTOR3* WINAPI D3DXVec3Project(D3DXVECTOR3 *pout, const D3DXVECTOR3 *pv, const D3DVIEWPORT9 *pviewport, const D3DXMATRIX *pprojection, const D3DXMATRIX *pview, const D3DXMATRIX *pworld)
{
    D3DXMATRIX m;

    //TRACE("pout %p, pv %p, pviewport %p, pprojection %p, pview %p, pworld %p\n", pout, pv, pviewport, pprojection, pview, pworld);

    D3DXMatrixIdentity(&m);
    if (pworld) D3DXMatrixMultiply(&m, &m, pworld);
    if (pview) D3DXMatrixMultiply(&m, &m, pview);
    if (pprojection) D3DXMatrixMultiply(&m, &m, pprojection);

    D3DXVec3TransformCoord(pout, pv, &m);

    if (pviewport)
    {
        pout->x = pviewport->X +  ( 1.0f + pout->x ) * pviewport->Width / 2.0f;
        pout->y = pviewport->Y +  ( 1.0f - pout->y ) * pviewport->Height / 2.0f;
        pout->z = pviewport->MinZ + pout->z * ( pviewport->MaxZ - pviewport->MinZ );
    }
    return pout;
}

ytf228693995

真的不错呢，很不错的样子

冷雨夜~~

算法很简单这是E的直接套上就能用
.版本 2

视角宽 ＝ 窗口宽 ÷ 2
视角高 ＝ 窗口高 ÷ 2
相机Z ＝ ViewWorld [1] [3] × 敌人X ＋ ViewWorld [2] [3] × 敌人Y ＋ ViewWorld [3] [3] × 敌人Z ＋ ViewWorld [4] [3]
' 输出调试文本 (相机Z)
.如果真 (相机Z ＜ 0)
    返回 ()
.如果真结束
缩放比例 ＝ 1 ÷ 相机Z
相机X ＝ 视角宽 ＋ (ViewWorld [1] [1] × 敌人X ＋ ViewWorld [2] [1] × 敌人Y ＋ ViewWorld [3] [1] × 敌人Z ＋ ViewWorld [4] [1]) × 缩放比例 × 视角宽
相机Y ＝ 视角高 － (ViewWorld [1] [2] × 敌人X ＋ ViewWorld [2] [2] × 敌人Y ＋ ViewWorld [3] [2] × (敌人Z ＋ 26) ＋ ViewWorld [4] [2]) × 缩放比例 × 视角高  ' 头
相机Y2 ＝ 视角高 － (ViewWorld [1] [2] × 敌人X ＋ ViewWorld [2] [2] × 敌人Y ＋ ViewWorld [3] [2] × (敌人Z － 35) ＋ ViewWorld [4] [2]) × 缩放比例 × 视角高  ' 脚
方框宽高 ＝ 相机Y2 － 相机Y