Bool Tools2 Trim

bool tools2 trim.skp (184.1 KB)
I’m trying to get an understanding of the use of Bool Tools2 trim command.
I have a skp file showing two cubes penetrated by two cylinders.

In the cube nearest the origin, I selected the cube first and the cylinder second.
In the cube furthest from origin, I selected the cylinder first and the cube second.

I expected both results to be the same but as can be seen in my skp, they are different.

Can anyone explain this difference to me?

With Bool Tools 2 the object to be trimmed is selected first. Then the object that does the trimming gets selected.

Moving the cylinders back you can see that exactly what;'s happened.

The cube nearest the origin has a hole trimmed out by the cylinder. In the second cube, the cube has trimmed the middle out of the cylinder.

The order is obviously important because the tool would have no idea which thing is the trimmer and which is the trimmed without that order.

I see the effect of trimming in the furthest cube, but I don’t see any trimming in the nearest cube.

See my edit. Move the cylinders back and you can more easily see the hole. You can actually see the z-fighting due to faces in the same place when the cylinder is still in the hole.

If you don’t want to keep the trimmer component, you could use Difference instead of Trim. It’ll delete the trimmer after it has been used.

Aaah. By separating the two parts I can see and appreciate the differences. Now to go through a similar exercise for the other Bool Tools2 commands And then maybe for the Flip Along commands also.

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