For this, you can use the x/y parameter of the command:
; CameraViewport Example ; ---------------------- Graphics3D 640,480 SetBuffer BackBuffer() ; Create first camera cam1=CreateCamera() ; Set the first camera's viewport so that it fills the top half of the camera CameraViewport cam1,GraphicsWidth()/2,0,GraphicsWidth()/2,GraphicsHeight()/2 ; Create second camera cam2=CreateCamera() ; Set the second camera's viewport so that it fills the bottom half of the camera CameraViewport cam2,0,GraphicsHeight()/2,GraphicsWidth(),GraphicsHeight()/2 light=CreateLight() RotateEntity light,90,0,0 plane=CreatePlane() grass_tex=LoadTexture( "media/mossyground.bmp" ) EntityTexture plane,grass_tex PositionEntity plane,0,-1,0 While Not KeyDown( 1 ) If KeyDown( 205 )=True Then TurnEntity cam1,0,-1,0 If KeyDown( 203 )=True Then TurnEntity cam1,0,1,0 If KeyDown( 208 )=True Then MoveEntity cam1,0,0,-0.05 If KeyDown( 200 )=True Then MoveEntity cam1,0,0,0.05 RenderWorld Text 0,0,"Use cursor keys to move the first camera about the infinite plane" Flip Wend End