Hello,

I have many curves I bring into a stage, they have a pscale attribute to vary width/thickness along the curve. I'd like to control that in my scene graph but can't figure out how. If I apply a basis curve width property I can change the width on the fly, but it's uniform along the curve.

Is there a way to use pscale as basis and multiply from there? Something along a wrangle in my scene graph?

There's the Attribute Wrangle LOP... It's the best (only?) way to perform arbitrary edits to array based USD attributes without jumping into SOPs (which gives more flexibility, but is more complicated to manage).

Thanks Mark,

I've looked at the functions and syntax and decide it wasn't a very good fit for our team. Adjusting curve width on a shot by shot basis is a requirement in this case.

Which leads me to the question of how effective the curve file cache is, if we have to change things in a SOP modify for the USD to be rendered. How are the changes handled, in memory or temp cached to disk for Karma to render?

Happy day.

mtucker
There's the Attribute Wrangle LOP... It's the best (only?) way to perform arbitrary edits to array based USD attributes without jumping into SOPs (which gives more flexibility, but is more complicated to manage).

I thought the edit properties and related primitive edit nodes would allow modifying an array property in multiply mode, but it only writes back a single value array.

BTW, I found a bug when testing this. When a mesh has an array primvar with vertex num elements such as display color and using an edit properties node to modify the value to a single value array, the viewport doesn't update to displaying the array values after removing or disabling the modification. Only reloading the mesh results in the viewport updating the display color with the full array of values. Karma displays it correctly, so it's just a gl update issue.

Andy_23
I've looked at the functions and syntax and decide it wasn't a very good fit for our team.

Could you wrap the wrangle in an easier-to-use HDA maybe?

Thanks antc I'll look into that.

Andy_23
Hello,

I have many curves I bring into a stage, they have a pscale attribute to vary width/thickness along the curve. I'd like to control that in my scene graph but can't figure out how. If I apply a basis curve width property I can change the width on the fly, but it's uniform along the curve.

Is there a way to use pscale as basis and multiply from there? Something along a wrangle in my scene graph?

Click on geometry and in the scene graph properties tab right click on width attribute and set it to edit. The Edit property node will open, so you can edit it in Solaris.

The wrangle method is the best i think. you can do it as the image attached.

override an attribute