kurtz le pirate <kur### [at] gmailcom> wrote:

> But i can't see that the thread is helical.
> How do you see it?

If you look at the bottom of the hole, you'll see where the thread tapers off.
If you want to accentuate that, if you're using a difference {}, then you could
use a slightly different pigment color, or a normal.

You could even just change the lighting and cast a harsher shadow.

- BW

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