copy along curve with orientation and gradual scale

Forums Houdini Indie and Apprentice copy along curve with orientation and gradual scale

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bartc: Member; 3 posts; Joined: March 2012; Offline

March 19, 2012 10:55 a.m.

Hi,

by using an online tuturial I have been able to copy an object along a nurbs curve with the object following the orientation of the curve
this by using a sweep sop in combination with a point sop adding normals

but how can I change the scale along the curve flow … I mean scaling the object with every copy along the curve by a certan value?

thx
bart


matthias_k: Member; 483 posts; Joined: Dec. 2006; Offline

April 8, 2012 1:52 a.m.

Please have a look at the attached image.
Hope that's helpy.

Attachments:
scale_copy.jpg (353.3 KB)

English is not my native language, sorry in advance for any misunderstanding :-)


ragupasta: Member; 349 posts; Joined: Aug. 2006; Offline

April 8, 2012 5:40 a.m.

That image looks a bit complicated if all you want is a scaling sweep.

I get the same effect with 2 circle sops and a sweep node. The trick is to enter “sqrt($PT)/3” in the sweep node's scale parameter.
I have a file here and I have made a helix and swept that as well. However if you increase the sampling you are going to need to change the expression multiplier (or division in this case). $PT is in there and resampling to a higher number will affect the scale.

Attachments:
sweep.jpg (780.7 KB)
sweep_scale_001.hipnc (57.9 KB)


James_Burg: Member; 153 posts; Joined: June 2010; Offline

April 10, 2012 2:08 p.m.

There are more then few ways to achieve your request .
I prefer to transfer point attributes but for the simplicity here is simple use of ramp parameter to control your radius on every copy of the circle on the “bone” curve.

Attachments:
scale_ramp.hipnc (124.4 KB)

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