vex wrangle custom @up vector strangenessssssss

[hughspeers]

Hi there 

this is really puzzling me and I was wondering if anyone could help. 

I'm making polygons disconnect and rotate. I'd like more control than the old primitive sop allows over direction of rotation so I've packed the polygons and I'm attempting to rotate them using some custom vectors. 

First I ran into trouble with the pivot not being as I'd expected on the surface of the polygon so I made a custom pivot. 

Then a wrangle rotating around an up vector generated from the prim @N worked fine. 

I then tried to make a custom @upA , firstly it did some very odd things with the transforms even when the values were set the same as the correctly working v@up. 

I noticed that the vector type was different than @up so converted the vector from float to 'vector' type xyz . So on the face of it the attributes look exactly the same. 

But very strangely produce different @orient results. 

Any help much appreciated

Ta 

John 

 

prim_rotate01_custom_up_axis01.hip

[Skybar]

You need to bind it in as v@upA. Houdini doesn't know that it is a vector, so everything that is bound as @attribute will be bound as a float. Exceptions are the standard attributes like P, N, up, v etc that is known by default.

[hughspeers]

Hi Skybar 

Thanks for that, I'd read elsewhere that may have been the thing to do but it doesn't seem to be working here.

I'm going to turn my machine off and on in case its some daft cache error

John 

[hughspeers]

Thanks Skybar 

that did do the trick for the v@custom_UP , I think the v@custom_pivot I had made was throwing me off course. Any v@up other than from the @N would through my rotations way off using it. 

I'll stick to the centroid for now even though its not perfectly on the surface of my polys. 

Thanks again 

John  

 

prim_rotate01_custom_up_axis02.hip