> This model was exported from ac3d trial version ... as per one of the
> sslt caveats, the portions that I used sslt on (plastic hoses) I changed
> those unions to merge to bundle all the smooth triangles together

When you have an union of triangles, you only need to change "union" to 
"mesh" and you get a nice mesh. It should be faster than the union 
version, and especialy your merge.
If the triangles are correctly built, there should be no intrusion and 
thus, no need for a merge.
Some modelers, and ac3d seems to be one of them, export their working 
meshes as unions while they should export as mesh.

The difference between an union and a merge is that the merge suppress 
the internal surfaces. It's also slower in many cases as the individual 
parts are no longer individualy bounded. Each ray that encounter the 
merge's bounding box need to be tested against all the components.

The goal of the union is to bundle many components into a single, easy 
to manipulate, unit.


Nice modeling.



Alain

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