ID 217532 - Scanline render doesn't cull faces behind the camera when the projection is non-linear​

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Problem summary
Scanline render doesn't cull faces behind the camera when the projection is non-linear​. 

Steps to reproduce

1) Open the attached Nuke script.

2) Press Tab on the Viewer to see the 3D scene, the card with the Checkboard in is behind the camera, yet still being rendered, as shown by the ScanlineRender's 2D output.

Reproduced by support
I have reproduced this on all tested versions including:

Nuke 10.0v2 - Windows 10 - CentOS 6.7 - Mac OSX 10.11
Nuke 9.0v8 - Windows 10 - CentOS 6.7 - Mac OSX 10.11​
Nuke 9.0v1 - Windows 10 - CentOS 6.7 - Mac OSX 10.11​​
Nuke 8.0v6 - Windows 10 - CentOS 6.7 - Mac OSX 10.11​

Expected behaviour
When a card is behind the camera, it isn't rendered as if it is in front of it.

Actual behaviour
When a card is behind the camera, it is rendered as if it is in front of it.

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