Weld on or off shouldn't make any difference for rendering with Modo.
It's something that you may mess with if you have particular needs for processing the model in other ways, like editing it by pulling points around or if you want to break the model apart into different chunks with one chunk for each original surface, or some stuff like that.
If you're just going to render it directly then welding on or off won't make any difference.
- Michael
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