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John Carmark's ZFail Shaodw Volumes?

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I use ZFail algorithm to instead SDK's ZPass,code as follow: device.SetRenderState( D3DRS_STENCILPASS, D3DSTENCILOP_KEEP); device.SetRenderState( D3DRS_CULLMODE, D3DCULL_CW ); device.SetRenderState( D3DRS_STENCILZFAIL, D3DSTENCILOP_INCR ); shadow.Render( device ); device.SetRenderState( D3DRS_CULLMODE, D3DCULL_CCW ); device.SetRenderState( D3DRS_STENCILZFAIL, D3DSTENCILOP_DECR ); shadow.Render( device ); But got a strange effect,the tail face of the shadow volume displayed as second shadow of the render object,and the shadow which on render object seems fliped...... I changed the ShadowVolume SDK sample to ZFail shadow,got a same result,What is wrong? Thanks! We create world. [edited by - kimryo on May 2, 2003 3:46:06 AM]

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