After some trial and error I think I have cracked how to cleanly separate the two pieces of my current composition so that I can render out the blood cells moving while also putting the background on a separate layer so I can give off the illusion the cells are passing behind something not there.
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| First test purely using a basic "use background" shader, didn't go so well. |
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| Tweaking the render settings so that it would be visible and traced but not produce shadows. |
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| A combined image that includes the picture above and a shot of the tunnel. |
Seeing how the tunnel turned out I do think I need ot tweak the lighting a little to add a hint of colour and vibrance.
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