Glass Tunnel
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Here is how to achieve this effect.
PROTIP – Creating Light Variance in Normal Maps:
First I grabbed my normal map straight out of xNormal, and a normal map of a sphere. With this I start making normal map swatches from opposite sides of the normal map sphere.
This gives us normal map gradients from left to right, up to down etc that can be then overlaid on top of our normal map to fake the concrete chunks being angled slightly. I do this by grabbing chunks of concrete and dragging the gradient across several pieces at once. Like so:
VERTEX