Hi,
as a newbie I cannot figure out why I have an attribute mis-match in my merge SOP.

Thanks in advance

You created a volume , so your other stream of date is missing name()

Rob

but how should I fix that…?

ahhh, I understand. Inserting an attribute SOP and deleting the primitive name attribute.

Thank you very much

There's nothing to fix, its a warning and not an error

Rob

If you merge two streams of data which have different attributes, Houdini doesn't know what to set the attributes to on the stream of geometry which didn't have that attribute, so it basically guesses (might be a bit more to it than that). This is why on the warning it says (something like) “attribute values may be initialised to unexpected values”.

The only way around it is to manually balance your attributes before merging the two data streams by deleting and/or creating attributes on both sides so both streams have the same attributes.

Like Rob said, its not an error though, its a just warning that Houdini is telling you its setting some attributes on geometry to values that you may not want.

Dean_19
…Houdini doesn't know what to set the attributes to on the stream of geometry which didn't have that attribute, so it basically guesses (might be a bit more to it than that)…

guessing would be dangerous
Houdini sets them to default value of that attribute, which you can set in Attribute Create

Aha!, I learnt something, Cheers Tomas!