I am currently trying to run a walkability test on a neighborhood I built. Unfortunately Rhino shows this error:

umi mobility error: The network graph vertex count did not equal the number of nodes the graph was created from. This is an internal umi error and should be reported as a bug. In the meantime, try re-layering your model's streets.

I imagine it has to do with the fact some of my streets might not be connected to the network, but apart from that I don't see any problems in my model. Does it matter if the streets are not coplanar with the floor and start from the top of a building for example? Can I assign multiple connections to the network for a same building?

If there is anything else I should do to make my simulation run, please let me know.



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I actually found out my mistake. Some of my buildings were simply not connected to the street grid.



That actually shouldn't cause that problem - do you still have a broken version of the file you can upload?

Hi Cody,

Sorry but I don't anymore.

Thank you anyway

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In Short

Umi is a Rhino-based design environment for architects and urban planners interested in modeling the environmental performance of neighborhoods and cities with respect to operational and embodied energy use, walkability and daylighting potential. Since 2012, Umi has been  developed by the Sustainable Design Lab at the Massachusetts Institute of Technology with support from a National Science Foundation EFRI_SEED project, the MIT Energy Initiative, the Kuwait-MIT Center, the Center for Complex Engineering Systems (CCES) at KACST and MIT, Transsolar Climate Engineering and United Technologies Corporation. Further tool developed is now also being conducted at the Environmental Systems Lab at Cornell University.

A first public version of Umi was released during a public symposium on Sustainable Urban Design on May 6th 2013 at the Massachusetts Institute of Technology. Version 2.0, which also includes an embodied energy module, was released on November 7th 2014.

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