Move projected point on mesh

Grasshopper
1

Hi there,

I’m pretty new to rhino and grasshopper. However i have some solid experience with other CAD sofwares like Fusion or Freeform (voxel).

I’m trying to get familiar with the imensity of grasshopper’s design possibilities.

So i’ve been practicing with pretty simple stuff but i can’t acheive what i want.

My main goal is beeing able to modify a curve projected onto a mesh surface. Idealy i want to modify the points directly on the surface and not throught the projected component. Exactly like i would do on Geomagic Freeform

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Here’s my struggle with a simple point exemple :

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As you can see i’m projecting a point onto a surface. I can easily transtlate the projected point by translating the original point with the gumball.

How can I translate the projected point instead of translating the original point ?

Thank you very much for you help !! :slight_smile:

Quentin

2

To move a grasshopper point on a mesh in real time you can use Kangaroo and the grab component.

3

You can move the point by itself because it’s an input - however, you can’t move the projected point because it’s an output - you’ll probably find PullPoint more useful than project - trying to set-up a gumball on the projected point isn’t worth the effort you’ll put into it, when you can easily adjust the projected point location with the input point already

4

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You will have to replace the mesh with your own. The part after the solver flips the normal so it always points upwards. I added this because my mesh example isn’t closed.

grab_move_point_on_mesh.gh (23.4 KB)

5

Thank you guys for your help.

Actually, in my case, moving the input point wouldn’t be good enough because I’m drawing onto organic shapes and the curve is very different in between the projection point of view and another angle. It is essential for me to be able to move the curves easily directly from the 3d view.

@martinsiegrist I spend quite a lot of time today reading another similar thread were you helped a dude with something similar. I’ve been able to come up with something very satisfying using your kangaroo method. I went thru a lot of learning today that was so fun.

I will have a look tomorrow to the file you attached.

Thanks you very much. I’ll keep you posted.

6

:slight_smile: I like this kind of stuff :slight_smile:

Post a link to the other topic…

7

It was that thread : How to stick movable points permanently to a mesh?

Here’s what i came up with. I dunno if i will keep this scheme but it helped me understand a shit ton of grasshopper and rhino principles. Even tho i still dont understand 100% but i eventually will !

So far i’m able to set a few points that are interpolated to a projected curve. And i can edit the curve directly onto the mesh. I’m pretty stocked that’s awesome !! :slight_smile:

Next step is to display the curve and points thicker and with color. Will do some research to figure that out.

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Have a good one