Cut out image from solid using solid difference

[Tim27 (Tim)]

Hello everyone,
I would like to project an image onto the surface of a body and cut it out of the body. In order to obtain the contours optimally, I would like to cut to different depths depending on the black and white values.

My previous approach was to use the image sampler to create a cylinder with different heights, i.e. high black value → high cylinder, then I created the cylinders into a single mesh in the hope of reducing computing time (purple code). I projected the result onto a body using the splop function, slightly shifted along the normal, if I then use the mesh difference component (connect the two blue groups), it takes a very long time to load, it worked with the giraffe, with other images the program has already crashed for me. I don’t like the result very much either.
ImageZylinder.gh (618.7 KB)

Another approach I took was to create a mesh and then move the vertices accordingly using the output from the image sampler. I like the result much better visually. However, I now have a “deformed mesh surface” as a result. I think you actually need a solid for mesh difference. Also, with this method I have the background and not just the giraffe.
ImageConstructMesh.gh (598.4 KB)

Does anyone have an idea what I could do better or an idea for an alternative approach. I would like to 3D print the body later in the hope that the image is recognizable.

Thanks in advanced
Tim

[laurent_delrieu]

Hello
and why not using a fine mesh with some displacement ?
And if you don’t want background you’ll have to have it all white or all black. Using a “good” image is essential.

Texture displacement

pls can any one help me to create texture displacement in rhino

Sub Object Displacement / Sub Object Selection

I am attempting to follow this tutorial: https://www.youtube.com/watch?v=5CVBMFh0NXI which in essence is about bump map textures, and applying them to a sub object, in this case wrapping them around a cylinder exterior while keeping the rest of the object smooth, as in the case of a bike handlebar grip. I can implement the texture on a basic polysrf cylinder surface, but can’t seem to do it with a subD object. This could very well be because my subD game is not strong. I selected all the face…

[Tim27 (Tim)]

Hi Laurent, thanks for your reply. Both forum posts you refer to do not use Grasshopper. It would be important for me to find a solution with Grasshopper in the end.

I’m not quite sure what you mean by fine mesh. Do you mean that the mesh is defined more precisely to get a better picture? That’s not what I’m interested in for now, it’s important to me that I can cut the image out of a body (like I did with the letters in the image).

[Quan_Li]

SurfaceRelief | Food4Rhino

[laurent_delrieu]

Image could be cut using Mesh Contour

[Tim27 (Tim)]

Thats a very good idea, thanks!

[laurent_delrieu]

A more general tool is Mesh Iso Splitting (you don’t need to displace mesh and it works on 3d mesh)

How to visualize Stiffness Factor?

Hello separating a mesh in multiple parts according to the weigths on vertex is simple. Just use Mesh iso splitting. I have that in my Nautilus plugin and also surely in some script found on this discourse. [image] And if you want more smooth result, I have a component for that (not free) [image] mesh iso split.gh (109.2 KB) I use here color luminance, but it will work with the output from “Quad Results”

Reaction diffusion curves

Hello Or your question is not clear or you didn’t search a lot. Reaction diffusion output values on mesh. Theses values/double can be transformed to displacement or color or be used by mesh iso spliting. All the tools are in Nautilus plugin. I made some more advanced way to have nice curves. Mesh iso spliting outputs meshes or curves. Come back with a script or better description if there is a problem [image] Better smoothness using Catmull & Clark subdivision on mesh and values ! Excl…

And now, for field, there is also Isopod and IsoCutMesh

Isopod - implicit surface tools

Yes indeed - this technique can also be applied for generating mesh textures. However, the speed comparison you show isn’t a meaningful one, as you would never use ValueAt with a list of thousands of individual points for something like this when you can simply generate the mesh texture directly with the FieldTexture components and it takes only milliseconds. [image] [textrn] spinodoid_texture_example.gh (2.8 MB) You can also use IsoCutMesh to split a mesh with a field: [meshsplit]