When we walk along the beach and see a smooth, polished rock, we may not think about all the centuries that that rock was pounded by the waves to get so polished. What I uploaded is a polished rock.
The actual design took a huge amount of time (several days on this project alone). I'm embarrassed to acknowledge how long it took, mostly because I figured it out through trial and error. After I started making toolpaths, I noticed that each layer cut into the previous layer, so I had to calculate how much offset was needed for a 60 degree vbit to not cut into the previous layer, then offset and trim the vectors accordingly. And since the heart is at the surface, each subsequent layer is deeper relative to the heart, and so had to be offset more from the heart. It took bloody forever to do all the offsetting of all these vectors. I'll upload 3 pictures, the original vectors, a view showing all the offset vectors I drew, and the final, trimmed vectors.
One thing that made it easier is the symmetry. I would only edit on the right side and then create a mirrored copy to create the left side. The keyboard shortcut Ctrl-Shift-H, which does this, made this a lot easier.
I have to admit I'm really happy with how it came out. Not bad for a "Vectric Apprentice."
Gosh, thanks, Ted. I'm flattered.