Working with large ish mesh data

Hi Group
i have a mesh scan of the front of a house imported into rhino 7, it is 289mb and 8,114,715 polygons…
it has the colors mapped on it so it looks like the front of the house in rhino 7.
i want to design some new features to the house with the scan in the background however it seems slow in rhino 7 even though I got a high-specked laptop running: 11th Gen Intel(R) Core™ i9-11950H @ 2.60GHz 2.61 GHz with 128 GB of ram…

what is the best way to design like this?

  • do I just put up with any lag
  • do I try to resize the mesh and if so can I keep the colour map still looking like the actual house? (like the iPhone scans they look great until you look at the mesh :slight_smile: )
    or is there any other techniques?

Basically, once I have sized the scan and created some datums / working planes then the mesh can be reduced to whatever as long as the image of the house still looks original as once I start working of the new datum points and planes then the house will only be there for visual reference and also for the client to see the finished work in a realistic way.

Is the mesh one object, or are there many small meshes? If there are many small meshes, you may get a speed-up when you Join all meshes into one big mesh. Even if they are not touching, you get one mesh. The drawing routine then needs to draw only one mesh, instead of a lot of meshes.

Also, you could work with background pictures maybe? If you have no real need to have the scan in 3D while modeling, that will certainly help.

Lastly, ReduceMesh may also help here, but as you say I’m not sure about the color preservation.


check document unit used in rhino. For large objects as house, set unit to cm could be faster.

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Hi Menno Deij

i reduced the mesh considerably and the color maps seems to not of changed which is the perfect scenario :slight_smile: thnakyou

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back ground pictures are not as good as a 3d representation that can spin around with the model etc…