cylindrical anamorphic

Hi all, i want to produce a cylindrical anamophosis , i know the way to do a normal anamophosis, are there any ways to achieve it in grasshopper , can i merely change the original definition or i have to come up with a new one ? The common defination of anamophosis is attached below with the outcome i want to achieve. Thank you!!!

Attachments:

Anamorphosis.ghx, 357 KB
anamorphic-sculpture-jonty-hurtwitz-1.jpg, 312 KB
anamorphic-sculpture-jonty-hurtwitz-6.jpg, 125 KB

Replies to This Discussion

Permalink Reply by Jonathan Fan on April 28, 2017 at 2:49am

Permalink Reply by David Rutten on April 28, 2017 at 2:50am

What sort of geometry are you hoping to deform? Is it meshes? Curves? Breps? Is the geometry dense enough to be deformed on a vertex by vertex basis, or does it need to be locally adapted?

Permalink Reply by Jonathan Fan on April 28, 2017 at 3:03am

Hi, i am trying to deform a building i built in rhino, its a berp but i can turn it into mesh if needed for the deformation.it should be dense enough , worst case senerio i can even turn that into a mass model which is just a few blocks. it's the best to have everything including the mullion, but i think the file might be to big to do so ?

Permalink Reply by David Rutten on April 28, 2017 at 4:26am

If you have a dense enough mesh then it's the simplest case because a mesh is easily deformable. Simple shapes like long lines or big boxes will have to be deformed into curved geometry and this conversion is mathematically complicated. So, if you can go for meshes, absolutely do so.

So the next question is how to map a point from the 'visual' space into the xyz space, using some custom mirror. I've never done this before, but I imagine what you do is pick a location for the eye and place the target shape inside the cylinder. Then, for each point in the target shape, see where the line from the eye to that point intersects the cylinder, figure out the reflection angle (should be easy, just rotate the view ray through 180 degrees around the cylinder normal) and measure the distance from the intersection point to the target point.

Is that all there is to it?

Permalink Reply by David Rutten on April 28, 2017 at 4:43am

Yup, seems to be all there's to it.

Attachments:

anamorphic_cylindrical.gh, 18 KB

Permalink Reply by phillip on April 28, 2017 at 8:22am

Nice!

Is there a better way than string operations to work with the param [Mesh Face]?

(E.g. if I would want turn the mesh outside-in again, I need quite some effort to convert to a list of Int, reverse and reformat the list.)

Permalink Reply by Jonathan Fan on April 28, 2017 at 6:44am

yeah that's it , sounds pretty hard to do, but i am a bit confused about the points , i will give it a try , thanks a lot

Permalink Reply by David Rutten on April 28, 2017 at 7:42am

You did see the file I attached to that post right?

Permalink Reply by Jonathan Fan on April 28, 2017 at 9:26am

oh ,i missed it , thank you so much!!!

Permalink Reply by peter fotiadis on April 29, 2017 at 1:10am

Just spotted that one: I have a C# that does that (in 3 modes: pt to pt, cylindrical and spherical) ... but I sincerely doubt if you can do something realistic (watertight meshes for 3d printing, that is) out of a relatively complex building.