3d modeling from grayscale image, elevation rings

I’ve been cutting out some pinewood derby cars and mostly happy with my results. But when I put the modeling in carbide create The model is stepped on the preview and also after I carve it, there are steps in elevation is that something in the software or is there something I can change to get rid of that?

I have been sanding them smooth, but would love to just carve it smooth

Post the file?

What are the settings for the finishing passes?

I’ve found that if one runs a succession of finishing passes w/ ever smaller tooling the results can be about perfect.

That is what it looks like in the modeling section and tool path section and the finest carving results in these rings or steps. I’ve used grayscale images from a couple sources and I’m getting elevation rings.
this is the image I am using

this is the carbide file.
Aston Martin top.c2d (98.1 KB)

Do you have an STL file of the model you can share?

You can see something of these lines in the 3D model of the file:

It might be that setting 3D model resolution to Very High will help:

I tried exporting the image, changing the model resolution to “Very High”, and re-importing the image and gets “just a little bit” better. But the rings are still there in both the “Show 3D” and the Simulation.
I modified the image in Gimp to smooth out the gradient & reimported it to CC, and it looked the same.

I suspect it’s just a limitation of the algorithm that converts the 2D image to a 3D model.

Will, can I ask what is the format the “MODELV1” element in the .c2d file?

I do not know what format that is — it seems to be a preview — you can delete it and the file will still open fine.

Actually, as Im looking at the grayscale image I think I can see the rings in the image.
Im using this website.
also this one, variation of the same.
to convert the stl to height map.
STL from here

Maybe there is a better conversion option that has smoother gradient in grays?

There are only 256 shades of grey in the colourspace used here, from pure white to pure black.

That means a maximum of 256 layers or changes in depth.

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I thought of that too. At 1 1/2" tall, that’s about 0.006" per slice. So a really shallow slope will have 0.006" steps. Sad, because the amount of data in one pixel would allow for over 4 billion different values, (r,g,b,a) and they only use 256. And the 3D model data (Stl, etc…) is also capable of nearly perfectly smooth.

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