A Sweep Knot Problem (Sweep Node)

[Lyonz]

Hi all,

Im trying to use the sweep node to add spheres to points wondering:

1. Is there a way to create a group for this sop to use ?

2. Why does the point number change ?

3. Making the object 1 curve doesn't work get an error saying carnt compute the dihedral ?

Thanks

knot_Problem.hipnc

[Lyonz]

This problem of objects duplicated on points, doesn't happen on a open curve or a circle, only when another curve is fused on together. I would use the copy sop but have a bigger problem im trying to sort with the objects spinning hence using the sweep node.

Edited November 4, 2010 by Lyonz

[anim]

yes, it seems that Sweep doesn't like fused points with more than 2 edges

but what problems do you have with copy SOP?

you can get tangent on your curve by Polyframe SOP then rename to N

and as up-vector you can either define simple vector for simple shapes like yours or just by per-vertex vector to second altered curve you want "up" to point at, just like reference points in sweep sop

then you'll have stable copies on points

[Lyonz]

yes, it seems that Sweep doesn't like fused points with more than 2 edges

but what problems do you have with copy SOP?

you can get tangent on your curve by Polyframe SOP then rename to N

and as up-vector you can either define simple vector for simple shapes like yours or just by per-vertex vector to second altered curve you want "up" to point at, just like reference points in sweep sop

then you'll have stable copies on points

Would you have an example of this using groups for different points as was unable to see groups in the sweep node.

[anim]

sweep nodes takes primitive groups because it acts on whole primitives (curves)

but with copy sop it is not a problem to use point group

how do you want to use it? to specify on which points to copy? or in other way?

here is example of my previous post on orienting copies with other curve

also there is specified group of points

knot_copysop.hipnc

[Lyonz]

sweep nodes takes primitive groups because it acts on whole primitives (curves)

but with copy sop it is not a problem to use point group

how do you want to use it? to specify on which points to copy? or in other way?

here is example of my previous post on orienting copies with other curve

also there is specified group of points

I understand the file you have shown me but its not exactly want im after. Wondering if there is any other nodes that can copy geometry to points ? As when i use this linked shape (Like the one in the file you have posted) on a curve with the copy sop the copied geometry spins. Also when i use the sweep node they dont spin (which i want) but creates a knot.

You mentioned that the sweep node works on primitives so guessing there is no way of creating a point group with this node?

Wondering if there is an expression to lock down all points as this would fix my problem?

Lyonz

[anim]

i have shown you how to prevent spinning by creating N and up attributes

but maybe by showing you how to control orientation of copies i've made impression that copies spin, but they only spin as i want them to

here is another file, with all of them facing upwards

knot_copysop2.hipnc