Project to plane, creating solid

[lander (CAD CAM CNC)]

@brooks

project a closed brep onto a plane, creating a single solid closed brep that includes all of the space “inside” the projection

hmmm getting more coffee, brb…

@brooks

project a closed brep

I’m not sure but sounds like smashing and creating overlapping 3D data onto a 2D plane – which doesn’t sound good to me…

@brooks

need to project a brep onto a plane, but creating a solid between the brep’s countours and the plane. In something like Solidiworks or Onshape, I would extrude the projection with “up to next” to fill in the space under the brep. But for the life of me I can’t figure it in Grasshopper.

I’ve been keeping my eye on this thread cause this sounds like a good example of real world ‘constraint’ based modeling etc.

@brooks

extrude the projection with “up to next”

ahh yes I remember those days of doing lots of that ability. I think Rhino should learn something from real world constraint based parametrics. GH skips these fundamentals alot imo, and goes off into the abyss.

It’s as if GH took off in a rocket ship, but teleported first into orbit and skipped the basics lol.

There’s a parallel universe where the GH ppl think they know what parametric modeling is, and the regular 3D solid modeling folks actually think they know too, but they’re much much different – It’s pretty weird dichotomy imo

Still waiting for GH to make a ‘helix’ component

Seems like there’s a thread recently that discussed the ‘upto next’ strategy for ‘fillets’ …

I think this was the other thread that reminded me of this ‘upto’ ‘next’ modeling strategy:

Wish: Enhanced Fillet surface + BUG

After playing a bit with the latest Rhino 8 WIP, I noticed that there is a lot of room for improvement for the “Fillet surface” tool. So, I made an image with some descriptions of the enhancements I would like to suggest for future development. Hopefully they will be greenlighted and be available in the retail Rhino 8. Remembering the used values is especially important, because there is virtually no way for someone to remember some random numbers for the next session or after us…

The words that were used were ‘extend’ but some reason my neurocortex puts them together, ‘extend’ ‘upto’ ‘next’

Yeah this is jus smooshing the data onto the plane I think:

I recommend looking at this from a ‘geometrical-constraint’ standpoint. There’s definitely lots of value in these type(s) of tool(s).

Devs should add to their pile.

Bascially these smooshed ‘breps’ are useless being all smooshed:

I’ve dealt with similar dilemma. I think it lead me to using ‘mesh outline’.

Silhouette is similar but probably too messy.

‘brep outline’ would prob be better idea, but might not exist yet.

too bad there’s not a mesh outline component

I was thinking to maybe do an intersection at the plane between the two breps, but I think my CPU exploded lol

This is slightly related imo maybe:

Create air volume model

That’s actually where i was heading. Revit does a great job filling up the space via a Room Element. The quickest way to accomplish this is one Room Element, making sure it goes to the bottom and top. To get the not rectangle shapes you need to calculate volume for the room. [image] This quickly creates a simple brep of the entire volume [image]

It would probably help to know where the original brep geo is derived from imo.

Also, not sure what you’re after. It seems like you want to automate the mold making process for any given geometry, which is easier said than done.

But it’s not that hard to do it manually either. While each different design may require different custom attention.

There’s more than one way to make a mold for the same object.

Unfortunately I found signs of a possible pattern of anomalies:

I was able to ignore the anomalies and extract a full upper profile to make a planar srf ‘plug’.

It’s a good indication that that upper curve is really close to being at the apex all the way around the brim edge of the cup – per say.

Not sure if this illustrates what the geometry is you want:

bbl