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C-/C++-Quelltext

void MeshModel::Pick()
{
    // get the current transform matrices
    D3DXMATRIX p_matProjection, p_matView, p_matWorld, p_matInverse;
    g_pd3dDevice->GetTransform(D3DTS_PROJECTION, &p_matProjection);
    g_pd3dDevice->GetTransform(D3DTS_VIEW, &p_matView);
    g_pd3dDevice->GetTransform(D3DTS_WORLD, &p_matWorld);

    // use the mouse coordinates to get the mouse angle
    POINT MousePos;
    GetCursorPos(&MousePos);
    float xAngle = (((2.0f * MousePos.x) / EngineManager::width) - 1.0f) / p_matProjection(0, 0);
    float yAngle = (((-2.0f * MousePos.y) / EngineManager::height) + 1.0f) / p_matProjection(1, 1);

    D3DXVECTOR3 origin, direction;
    origin = D3DXVECTOR3(0.0f, 0.0f, 0.0f);
    direction = D3DXVECTOR3(xAngle, yAngle, 1.0f);

    // find the inverse matrix
    D3DXMatrixInverse(&p_matInverse, NULL, &(p_matWorld * p_matView));

    // convert origin and direction into model space
    D3DXVec3TransformCoord(&origin, &origin, &p_matInverse);
    D3DXVec3TransformNormal(&direction, &direction, &p_matInverse);
    D3DXVec3Normalize(&direction, &direction);

    // detect picking
    BOOL hit;
    float dist = 0;
    D3DXIntersect(mesh, &origin, &direction, &hit, NULL, NULL, NULL, &dist, NULL, NULL);
    
    if(hit && dist < EngineManager::marked && dist < 10)
    {
        g_pd3dDevice->SetRenderState( D3DRS_FILLMODE, D3DFILL_WIREFRAME );
        EngineManager::marked=dist;
    }
    
    else
    {
        g_pd3dDevice->SetRenderState( D3DRS_FILLMODE, D3DFILL_SOLID );
        EngineManager::marked=1000;
    }
    
}