Zooming in on a sphere

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Kieran

So I have this code snippet, use the up arrow to zoom in, down arrow to zoom out. But when I zoom in on the spere, there comes a point where from the inside out it starts to disapear, how can I make the camera zoom right in on the spere, so it takes the whole screen without disapearing. Also Obviously for a space game, is using the camera as the space ship, and moving it around like this the way it's done?

Snippet:
Graphics3D 800,600,0,2

SetBuffer BackBuffer()

camera = CreateCamera()
CameraViewport camera,0,0,800,600

light = CreateLight()

cube = CreateSphere(16)
PositionEntity cube,0,0,5

While Not KeyHit(1)

If KeyDown(200) = True Then
MoveEntity camera,0,0,0.01
ElseIf KeyDown(208) = True Then
MoveEntity camera,0,0,-0.01
EndIf

UpdateWorld
RenderWorld

Flip

Wend
End