I probably missing something obvious but I'm looking for something like "restore rotation to defaults" at the SOP level. Visual example but from Blender (15-sec clip): Reset Object Transformations in Blender [www.youtube.com].

Context: I have 3 objects, I'm looping over them, adding a Match Size SOP to center them out for further manipulation. 2 of them facing the X axis, 1 in the Z axis.

Goal: All objects face the same axis no matter what axis were upstream.





What I've tried:

I've read the forum and found only about “Clean transform” on the object level: https://www.sidefx.com/forum/topic/13089/?page=1#post-62123 [www.sidefx.com] and similar things.

I've also tried Primitive Properties SOP node [www.sidefx.com] with "Do Transformation" turned on (1st input object to rotate, 2nd input created point with an Add SOP which transformed to positive X). It worked for me with geo without any loops (like a grid with 2 rows and 2 columns), which is not in my case.

Is it possible with Transform SOP? Is there a node that does that? Or it's a VEX implementation?

Thank you 🙂

So in SOPs, geometry doesn't have any sense of a transform unless it's packed. You could save the transformation of each extruded chunk as a detail attribute via the "Output Attribute" parameter on the Transform SOP, promote it to points, and then apply the inverse transform later on with Transform by Attribute SOP or a bit of code.

Packing makes this a bit easier and more performant. Before you transform your objects, pack them. Then you can do whatever transformations you want, and if you ever need them to go back to their default state, you just need to do a little VEX to reset the transform intrinsic attribute of the packed primitives:


If you wanted to do this without code, you could try MOPs Apply Attributes [github.com]. It makes packed transforms easier to handle with little to no VEX required.

I attached your file back with both the above methods shown.

Toadstorm (Henry? 🙂), grateful for your response!

You could save the transformation of each extruded chunk as a detail attribute via the "Output Attribute" parameter on the Transform SOP, promote it to points, and then apply the inverse transform later

Oh my God, I was tinkering with xform so much but never thought about promoting it back to points. Now it makes a lot more sense why it worked! Can't appreciate it enough 🙂

In SOPs, geometry doesn't have any sense of a transform unless it's packed

Interesting 👍👍


P.S. - looking forward to purchasing MOPs+ in the right situation. Thank you for making it!