Problem With Round Tool With Nurbs

[kzax]

Hi,
I'm trying to use the round tool to cut out holes in a plane, which I intersected with cylinders, but I can't have a nice junction between the 3 round surfaces, as you can see on the following image :

I tried to increase the tessellation : smooth edge at 0,999, highest curvature quality, and so on, but I can't reach a nice result.
Regards,
Philippe.

[ronviers-viers]

That is not the way I would go about it. You will have trouble getting tangency continuity all the way around the cylinder using trim. You may have better luck using loft (from a cylinder surface curve) or revolve (with a spline perpendicular to the cylinder edge) depending on what you have going on around at the other edge of the plane.

Ron

[kzax]

thanks for your answer. It solved my "gaps" problem, while now I use loft operation between trim edge on the plane and isoparm on the cylinder, and I move the hulls to obtain the nicer tangency possible. But I've a few questions.
If I want to make few holes like that on a surface which is not plane, I have to manipulate individualy each hull of each hole. So how can I have the same tangency everywhere? (for an industrial design) as I coud do with the round tool by entering the same round value.

[joojaa]

QUOTE(kzax @ 12/04/08, 06:39 PM) [snapback]296384[/snapback]
I tried to increase the tessellation : smooth edge at 0,999, highest curvature quality, and so on, but I can't reach a

One can extend this smooth value well beyond 0.999 by scaling object up freeze and scale object down without freeze. But basically you just wan to enable micropoly teseelation for mentalray edge approximation.

So if you scale up by 1000 freeze scale down to 0.001 its as if you set the value to 0.999999

In the later picture the trim overlaps the actual surface slightly. But just use the approximation editor it fixes this all.

Anyway i prwfeer nowdays to use parabolic rounding instead of rounds since it actualy makes amuch better results in c3 continuity

[kzax]

thanks,
the use of the approximation editor with an approx for trim curves solved the problem show on the last picture.
Scaling object to 1000, or more, improved the quality of the round junction made with round tool, but it's not ok yet... I think I have to follow another way to achive this.
What do you call 'parabolic rounding'?