Is it possible to create a solid/polysurface/mesh based on a block in either rhino or grasshopper? Since a block can consist of multiple items i want to know if it is possible to create one item(brep) with the exact same shape as the block. I have been thinking about using “shrinkwrap”, however i wonder if there is a better way.
You can use the Explode Object component in the Rhino tab to retrieve the geometries from inside a block.
yes, however when i try to join the exploded block i end up with a combination of meshes and surfaces that i cant join in to one brep
Then you’ll have to filter surfaces / polysurfaces and meshes. Convert the meshes into polysurfaces and then union everything. Depending on your requirements, shrinkwrap might be easier.
Thank you very much for your answer. I have tried using shrink wrap, but it seems to make the calculations go very slow. Your suggestion of converting meshes to polysurfaces seems smart. is there a simple way to filter out the meshes? Is using dispatch an alternative for instance?
Please post a Rhino file with some geometry.
Some of your objects are meshes, others are surfaces. Assuming these are windows, the frames are a mix of meshes and surfaces.
What is the source of such a 
file?
Is this file converted from *.ifc or Archicad?
On the screenshot below, you can see a part of a frame. This is an open mesh. The missing faces are saved as two separate surfaces. Really? 
It is converted from .ifc. I believe the ifc originates from Archicad.
Hehe it is a file indeed, however that is what i have to work with unfortunately. That is the reason for me wondering if there was a quick way to create a brep from a block(of ).
Any suggestions besides using shrinkwrap?
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I’m in the same situation every now and then.
What is the goal? What are you planning on doing with the geometry?
i want to evaluate the surface area (preferably as length x width). This can of course be done in the ifc. this is just so that i can limit my workflow to just rhino/gh
The main objective is to evaluate the shading of the windows (left, right and top) by measuring the distance to the shading object and the depth of the shading object.
I think Shrinkwrap is the least painful way.
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Hei Maar -
That geometry looks somewhat like what Sofie posted - Outline of mesh (shadow)
… and since it looks like you’re both located in the same town, I suppose this might be related.
I had started looking into Sofie’s case using the new-in-Rhino-8 Grasshopper components for dealing with blocks. I’m running into an issue - or multiple issues that I’ll try to find time for to check further. Those issues are specific to blocks being defined with a w0 origin and the actual geometry being quite some distance away from that and / or block instances being scaled by 100. In your case, the block’s base points are on the objects, and there’s only the issue of scaling…
Generally, something like this might work…
→ Working with block instances in a Rhino document.gh (15.4 KB)
-wim
ok. Thank you:) Any suggestions for settings to use? i am not very familiar with shrink wrap
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