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# Clipping and Setting Up Viewport

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yanuart    162
Can somebody tell me a goodway to set up my viewing fulstrum ?? Especially about how to make a camera object in D3D application and what does it take to make a camera object ?? I want to make a view based on where my camera object is placed, I''ve tried to render my scene, but it seems that anything under 0 on z axis wasn''t rendered. HELPPPP !!!

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S1CA    1418
Set up a perspective projection matrix (what is defined in this matrix is the parameters for the frustum - the near and far planes, the viewing angle [think of it as the angle of a cone] and the aspect ratio):

    D3DXMATRIX matProj;    D3DXMatrixPerspectiveFovLH( &matProj, D3DX_PI/4, 1.0f, 1.0f, 100.0f );    g_pd3dDevice->SetTransform( D3DTS_PROJECTION, &matProj );

Set up a "look at" view matrix (you tell it where the camera is in the world, and what it''s looking at, the "up" vector is to make the maths work, point it roughly in the direction which is "up" in the world):

    D3DXMATRIX matView;    D3DXMatrixLookAtLH( &matView, &D3DXVECTOR3( 0.0f, 3.0f,-5.0f ),                                  &D3DXVECTOR3( 0.0f, 0.0f, 0.0f ),                                  &D3DXVECTOR3( 0.0f, 1.0f, 0.0f ) );    g_pd3dDevice->SetTransform( D3DTS_VIEW, &matView );

Now here''s an interesting fact - the code above is copied directly from one of the D3D SDK tutorials. (The tutorials don''t use the D3D framework if that''s what was putting you off). I suggest you work your way through those official tutorials to the point where you totally understand all that''s going on in them.

--
Simon O''''Connor
Creative Asylum Ltd
www.creative-asylum.com