cameraviewport()

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ok heres the deal.

im trying to render a 1280x480 screen which is split into 2 640x480 halves. i have set up two cameras in order to render (pretty much) the same thing to each half. heres my code:


Const scrw = 1280
Const scrh = 480
; constants for screen resolution

Graphics3D scrw,scrh,16,2

Global maincamLEFT = CreateCamera(mainpivot)
; makes the camera for the user's point of view and attaches it to the pivot

CameraRange maincamLEFT,0.1,1000
; set vision range for camera

Global maincamRIGHT = CreateCamera(mainpivot)
; makes the camera for the user's point of view and attaches it to the pivot

CameraRange maincamRIGHT,0.1,1000
; set vision range for camera

CameraViewport maincamLEFT,0,0,600,480
CameraViewport maincamRIGHT,640,0,640,480



when i run it i get a memory access violation. whats going on?

cheers,
neil