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

> The attached image illustrates the issue well. Both objects are defined
> in the same way, but one is a union{} (magenta) and the other is a
> merge{} (cyan).
>
> It's a very very simple object: two boxes and four cylinders.

And that's the root of the problem:  it's TOO simple.

Remove the overlap of the two boxes by defining one central box, and adding FOUR
"leaves" or "wings" filling in the edges between the cylinder "corners".

Then I think it should work . . .

However, you may need to convert your corners from full cylinders to "pie
slices" by CSG - either home-rolled, or using Lohmueller's macro, which I
believe is in the drop-down insert menu as "segment of a cylinder"

-BE

(Perhaps do some other simple overlap tests to demonstrate what happens.)

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