Hi, I’m generating a heightfield from an Image Sampler: I create a point grid, sample grayscale values, remap them to Z, and build a Surface from Points. I’d like the black background to be completely ignored, so the 3D surface is created only from the remaining regions. My goal is to get a surfac…

Hello if mesh and use of Nautilus plugin are OK here is a way with mesh Iso Splitting The idea is to use MEsh Iso Splitting then connect naked edges (topology of 2 meshes MUST be the same) [image] I think it could be good to not put the same resolution in U and V and uses the one of the image. …

Decon the mesh, get the centrepoint of each face, test for Z coord, use that to filter the face indices when reconstructing the mesh. I’ll give this a go…

Better late than never - a similar solution with vanilla components. [image] image sampler_TN.gh (1.7 MB) I tried to get rid of the stair steps on the spine, but couldn’t see a clean way.

Thank you! :folded_hands: I’m just wondering how or if it’s possible to remove the step effect at the top

Thank you :folded_hands: Your generated mesh looks very good

Yes, it’s possible [image] But the method needs to be reworked to generate the infill “spine” Instead of doing all the mesh work and then cutting, the mesh needs to be generated on the flat before cutting, then reprojected to both sides before doing the offsets. I can work on this later, but not…

Step effects is due to the option “Interpolate” in Image Sampler that is not set. [image] IsoValue has also an effect. [image] [image] Here a version with different resolution on X and Y image sampler LD.gh (3.3 MB)

shakes fist at Laurent First use a low-resolution surface to get a contour line, at an adjustable height to get the desired cut-off: [image] Use that line to split a flat mesh: [image] (Low resolution shown for clarity) I do it this way because cutting the offset mesh directly makes a much m…

[image] Tomaszko1: I tried culling points by a threshold Hey @Tomaszko1 , I know the topic is solved so I’m just sharing for future reference—prior to generating your height field, if it helps: there’s a handy import image component that brings in your image as a mesh with the colors, so you c…

This works incredibly well. I’m very grateful. Is it possible to drive an attractor using the generated cutting curve? I’d like to control the offset of the points shaping this structure based on the top edge — specifically, I want the top line to have the same thickness along its entire length. I…

It’s a trade-off between a clean line in plan vs elevation, so yes you could have a consistent width, but it would be at a cost of an inconsistent profile. I didn’t take a screenshot, but when I tried it the profile became quite obviously a slice through a stepped mesh. So you’re right - you’d need…

3D surface from Image Sampler without points in black areas

Grasshopper

laurent_delrieu (Laurent Delrieu) January 20, 2026, 6:34pm 9

Step effects is due to the option “Interpolate” in Image Sampler that is not set.

IsoValue has also an effect.

Here a version with different resolution on X and Y
image sampler LD.gh (3.3 MB)

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3D surface from Image Sampler without points in black areas

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