Hello, does anyone know how to fill a mesh surface with random curves? something like this…
The Add Curve: Extra Objects addon (included with Blender) has a tool called Bounce Spline (3D view > T-toolshelf > Create tab > Spline panel > Bounce Spline) that will get you pretty close:
In your case, you don’t want to fill the whole inside of the shape, so solidify your mesh first to give it walls. Then select the object to fill and press the button to fill it with a random curve. You can add depth with Properties > Curve > Geometry > Bevel > Depth (you can do it in the operation redo panel as well, but that recalculates the curve each change and is slow).
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Yeah, this technique worked perfectly. Thank you very much 
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This tutorial is handy:
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