3D Scenes - Game Coding Complete - page 548

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behind every other object. Here s the helper class that sets the ID3DDeviceContext

for rendering a skybox:
D3DRendererSkyBoxPass11::D3DRendererSkyBoxPass11()
{

// Depth stencil state
D3D11_DEPTH_STENCIL_DESC DSDesc;
ZeroMemory( &DSDesc, sizeof( D3D11_DEPTH_STENCIL_DESC ) );
DSDesc.DepthEnable = TRUE;
DSDesc.DepthWriteMask = D3D11_DEPTH_WRITE_MASK_ZERO;
DSDesc.DepthFunc = D3D11_COMPARISON_LESS;
DSDesc.StencilEnable = FALSE;
DXUTGetD3D11Device()->CreateDepthStencilState(&DSDesc,
&m_pSkyboxDepthStencilState );

DXUT_SetDebugName( m_pSkyboxDepthStencilState, “ SkyboxDepthStencil ” );

UINT StencilRef;
DXUTGetD3D11DeviceContext()->OMGetDepthStencilState(
&m_pOldDepthStencilState, &StencilRef );
DXUTGetD3D11DeviceContext()->OMSetDepthStencilState(
m_pSkyboxDepthStencilState, 0 );

}

D3DRendererSkyBoxPass11::~D3DRendererSkyBoxPass11()
{

DXUTGetD3D11DeviceContext()->OMSetDepthStencilState(
m_pOldDepthStencilState, 0 );
SAFE_RELEASE(m_pOldDepthStencilState);
SAFE_RELEASE(m_pSkyboxDepthStencilState);

}
The goal for the skybox is to simulate drawing in the far background, without actu-
ally being in the far background. This little trick requires changing the depth stencil
settings to draw the polygons of the sky without affecting the current Z values of the
display buffer. Depth stencil state, just like blending states, has a wide range of cool
effects you can create, this being but one very simple one.

A Simple Camera
You ll need a camera if you want to take pictures, right? The camera in a 3D scene

inherits from SceneNode just like everything else and adds some data members to
keep track of its viewable area, the projection matrix, and perhaps a target scene node
that it will follow around:

'

class CameraNode : public SceneNode
{