I’m trying to change the axis of a block instance so that Y is up, not Z. Most of the parts I needed to do it to are oriented to world, so it’s pretty easy to just go to Right view, rotate 90 around the part’s origin point, then rotate it -90 back into place. But one part is rotated 7.6 degrees in …

I use a definition like this: [image] Get the point if insert from the block instance. Then create a new XZ plane at that point. This acts as the rotation point for the transform rotate component.

Thank you. I’ll check that out. I had given up on grasshopper for most anything I do because I couldn’t find the resources I needed to understand options for input and output, how to reuse things like this, etc. Knowing that it might be able to accomplish this, I guess I’ll have to look at it again…

What a language are you programming in. Or are you looking for a quick way to do this only in the Rhino interface? In the Rhino interface, I would think the gumball might help. But turning off its AutoCplane behavior will give the gumball that is rotated with the block instance: To prevent the Gu…

I tried a few times with Python with several methods. I never quite got it right. I gave a little go at grasshopper as well, but I have the same problem I always have when I go about trying to do something with grasshopper. The tutorials and examples always skip by how you would go about setting up…

These three components create the new rotation plane: [image] Grab the transform (includes insertion point and its current rotation) Turn that into a plane, Then send that into a XZ plane that will create a new plane vertical thru the blocks insertion plane so we can rotate on that axis. No ques…

Thanks for the illustration. I was able to figure that portion out. I think geometry nodes just isn’t the right solution for this since it’s just making a single change to some element in the scene. There’s no reason to make that parametric really. I don’t know how to actually “bake” that kind of th…

While I know grasshopper now has the ability to work with blocks. I still use Elefront for this stuff. Mainly because that is what I started with. It does have the ability to define a block on specific plane. [Screenshot 2025-07-01 111307]

You can insert blocks on a custom Cplane if you would like. Set the Cplane and then insert. And yes, without using Grasshopper or something. Inserting the block at 0,0,0. Then rotate it. Then everthing will rotate. NewBlockEdit makes that easier I would say in Rhino.

Yeah this has come up before. Block Definition Custom Plane - Grasshopper - McNeel Forum When dealing with a lot of blocks all at once and especially when you are nesting multiple blocks inside other blocks it is easier to not have to move the geometry from one plane. More often than not in a def…

Change block instance axis

Rhino

scottd (Scott Davidson) July 1, 2025, 7:23pm 10

I know this is not exactly what is addressed on the base plane. But, if the custom plane is created, running a quick transform to XY world will also allow a custom plane.

How do I set the origin plane of a block from grasshopper?

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Change block instance axis

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