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unique  
#1 Posted : Sunday, November 16, 2008 7:28:43 AM(UTC)
unique

Rank: Senior Member

Joined: 6/24/2008(UTC)
Posts: 591

HI,

Would somebody please show me an example(s) of how this function is used, im not making very much progress :p and I have an idea for it.

Many thanks in advance,
bradcan  
#2 Posted : Tuesday, November 18, 2008 11:57:16 AM(UTC)
bradcan

Rank: Member

Joined: 8/3/2008(UTC)
Posts: 55

Hi Unique
What is a variable blend - radius curve?
nick  
#3 Posted : Tuesday, November 18, 2008 3:54:39 PM(UTC)
nick

Rank: Senior Member

Joined: 2/2/2007(UTC)
Posts: 245

Hello Paul

Sorry, I hadn't forgotten just been a little busy with other things the last couple of days. Here's a quick movie which I hope explains Radius Curve Variable Blend.

http://www.cadsoftsolutions.co....e_blend_radius_curve.mov

The distance of the curve in y from the x axis defines the radius. It's a good idea that the curve length is equivalent to the length of the edge to be blended so as to be able to accurately position where each of the different radius values will be applied to the edge. If the edge is shorter then the curve will be compressed to fit and if longer will be stretched.

All the best
Nick
unique  
#4 Posted : Wednesday, November 19, 2008 2:09:30 AM(UTC)
unique

Rank: Senior Member

Joined: 6/24/2008(UTC)
Posts: 591

Thank you Nick !!
bradcan  
#5 Posted : Wednesday, November 19, 2008 9:03:56 AM(UTC)
bradcan

Rank: Member

Joined: 8/3/2008(UTC)
Posts: 55

A very nice tool, with a few caveats:

The position of the curve is real touchy! The curve must be on the XY plane but, not necessarily in the 1st quadrant as the manual says, Y must, of course be positive or zero since the Y value maps to the blend radius.

Worse, all those meaningless ACIS errors occur for no apparent reason! (situation detected too complex for capping, inconsistent face-body relationship, unable to construct acis geometry for blend, etc). These seem to be the result of trying to blend anything other than a single edge of a cube and/or using anything other than a spline as the defining curve. :confused:

Attached is an illustrating example; try to replace the spline with a conic or blend any of the edges of the half cylinder with anything. Also you can't select more than one edge or chain.
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Tim Olson  
#6 Posted : Wednesday, November 19, 2008 11:27:59 AM(UTC)
Tim Olson

Rank: Senior Member

Joined: 2/2/2007(UTC)
Posts: 5,447
United States

Was thanked: 499 time(s) in 353 post(s)
>>The position of the curve is real touchy!

Yes. All y values must represent a radius value that is "doable" for the given blend edge. Radius values are mapped parametrically from the radius curve to the blended edge. Parametric roughly approximates to percent along each curve. Where it radius curve starts or ends along x does not matter since were dealing with parametric locations, but it must be increasing in x.

As you noted, it's limited to single edge blending because of the mapping from one curve to another.

Checking into why it's not letting us use the conic as the radius curve...


Tim
Tim Olson
IMSI Design/Encore
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