Model Object with empty Object input outputs a <Null>

Serengeti (Rhino WIP)
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One thing that is frequently messing with my data structures is the Model Object output. Since I am only recomputing those objects that changed (offsets of curves and surfaces that I build from the offsets), I may get to situations where when I only delete an input curve for the script, the Model Object Input for new objects is empty. In that case, it outputs a <Null>, which changes the data structure later when merging the various data streams together (new objects, modified objects and objects to preserve).

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So my question here is, shoudn’t the output for the Model Object be empty instead?
E: It’s not like the <Null> output contains any useful data either.

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It should actually be empty, it is empty elsewhere in the file and when I place a new Model Object Component, it is also empty. Not sure how it got to this point. I have seen this happen quite a few times in the past and now on version 8 SR25 (8.25.25287.14001, 2025-10-14).

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Hi Intous,

I’ve assigned this to Kike to see if he can help.

In C# there is a difference between Null and Empty.

Null has no memory allocation for the object; empty has an allocated object with no content.

Empty

  • Represents an object that exists but contains no data

Null

  • Represents the absence of an object or reference
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Hi @Intuos,

Could you share the data structure you have here.

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Sharing the file with internalized data would help also.

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Hi @kike,
How would you like me to internalise the Model Objects? It’s something I haven’t quite figured out how to do best for trouble shooting purposes.

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In this case just knowing the data structure you have as input will be enough.

I can recreate the case with just this information.

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It disappears on undoing, but that wasn’t the case before this version.
I’ve removed any non-necessary components (can’t internalise any model objects or model layers). So in certain situations there are no objects to recompute (to update) and then I have empty inputs going in like in this sample.

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Null object in Model Object.gh (39.7 KB)

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Hi @Intuos

A fix for the Model Object with empty Object input outputs a : RH-90230 issue will be released on next Rhino release.

Thanks for reporting!

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