将鼠标坐标变换为三维坐标

我遇到以下问题：我有我的鼠标坐标，我有一个模型（数据点），我想要我的鼠标坐标的三维坐标和我的lookAt这个坐标的矢量，我可以用对象进行光线投射，以便我可以看到数据点的3d值。所以我想用鼠标点击，然后我想看看我点击的数据点的坐标。将鼠标坐标变换为三维坐标

我从教程中获得以下内容，但它不起作用。光线起源和光线方向是不正确的（我画我从射线方向和射线起源射线起源线是不是正确的？谁能帮我这里是代码：

// Move the mouse cursor coordinates into the -1 to +1 range. 
pointX = ((2.0f * (float)mouseX)/(float) screen_width) - 1.0f; 
pointY = (((2.0f * (float)mouseY)/(float) screen_height) - 1.0f) * -1.0f; 


m_D3D->GetProjectionMatrix(projectionMatrix); 

pointX = pointX/projectionMatrix._11; 
pointY = pointY/projectionMatrix._22; 

// Get the inverse of the view matrix. 
m_Camera->GetViewMatrix(viewMatrix); 
D3DXMatrixInverse(&inverseViewMatrix, NULL, &viewMatrix); 

// Calculate the direction of the picking ray in view space. 
direction.x = (pointX * inverseViewMatrix._11) + (pointY * inverseViewMatrix._21)+ 
    inverseViewMatrix._31; 
direction.y = (pointX * inverseViewMatrix._12) + (pointY * inverseViewMatrix._22) 
    + inverseViewMatrix._32; 
direction.z = (pointX * inverseViewMatrix._13) + (pointY * inverseViewMatrix._23) 
    + inverseViewMatrix._33; 

// Get the origin of the picking ray which is the position of the camera. 
origin = m_Camera->GetPosition(); 

// Get the world matrix and translate to the location of the sphere. 
m_Impact->GetWorldMatrix(worldMatrix); 
//D3DXMatrixTranslation(&translateMatrix, -5.0f, 1.0f, 5.0f); 
//D3DXMatrixMultiply(&worldMatrix, &worldMatrix, &translateMatrix); 

// Now get the inverse of the translated world matrix. 
D3DXMatrixInverse(&inverseWorldMatrix, NULL, &worldMatrix); 


D3DXVec3TransformCoord(&rayOrigin, &origin, &inverseWorldMatrix); 
D3DXVec3TransformNormal(&rayDirection, &direction, &inverseWorldMatrix); 

// Normalize the ray direction. 
D3DXVec3Normalize(&rayDirection, &rayDirection); 

//collision_object->setTransform(col_matrix); 
    collision_model->setTransform(col_matrix); 
    float collision_point[3]; 
    //bool collision_result = collision_object ->rayCollision(rayOrigin, 
      rayDirection, true); 
    bool collision_result = collision_model ->rayCollision(rayOrigin, 
      rayDirection, true); 

      if(collision_result == true) 
    { 
     intersect = true; 
     //collision_object->getCollisionPoint(collision_point, true); 
     collision_model->getCollisionPoint(collision_point, false); 
     *coordX = collision_point[0]; 
     *coordY = collision_point[1]; 
     *coordZ = collision_point[2]; 



    }

来源

2013-05-28 CmasterG

一个简单的方式来建立从鼠标线是如下（伪代码）

获取鼠标COORDS -1 - > 1米的范围内（因为你已经这样做）

创建视图投影矩阵（查看*投影）反其道而行。

Creat e 2小鼠载体：

near = Vector3(mousex,mousey,0); 
far = Vector3(mousex,mousey,1); 

rayorigin = transformcoord(near, inverseviewprojection); 
rayend = transformcoord(far, inverseviewprojection); 
raydir = normalize(rayend-rayorigin);

来源

2013-06-08 13:09:24 catflier

将鼠标坐标变换为三维坐标

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