VBGamer

Hi, Just compute the clip planes from your fov & camera pos. There is a ComputeClipPlane in the SDK D3DUTILS.BAs module Then use this code to do the frustum culling : Function CheckSphere(Center As D3DVECTOR, Radius As Single) As Integer Dim TCenter As D3DVECTOR Dim Matrix As D3DMATRIX, i As Long ' On Error Resume Next Device.GetTransform D3DTS_WORLD, Matrix TCenter = TransformCoord(Matrix, Center) For i = 0 To 5 Dist = D3DXPlaneDotCoord(FrustumPlanes(i), TCenter) If Dist < -Radius Then CheckSphere = 0 'not visible Exit Function End If Next i CheckSphere = 1 'visible End Function Just look at the TrueVision source code to find useful stuff ;) (TrueVisionGlobal.bas) hope this helps Sylvain www.Truevision3d.Com