Displace each point of the geometry along its normals. Used in combination with
3D Mask
3D masks enable selecting 3D vertices based on their different attributes such as position, color and texture coordinate.
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:
Here is a little tutorial to show you how to use it. You'll see also a little trick with
Legacy Blur
Blur the image
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to transform a 8bit picture into a 16bit one for smoother displacement: