What are your steps? That models look quite smoothened that might cause loss of small details like that. Try reducing the amount of smoothing or decimation.
I should warn you that trying to preserve cranial suture patterns patterns will not increase the accuracy of a ALPACA/MALPACA in a meaningful way compared to this model.
For some reason, Grayscale Model Maker can show the sutures better–I have not found an equivalent tool in Segment Editor, but sometimes Grow from Seeds can provide more detail than thresholding. Here I put in a threshold of 300 and this is the model.
From there, you can adjust color and surface features (roughness, metallic) in Models and also adjust lighting in Lights to enhance the visibility of sutures as well.
The easiest thing would be to overlay the volume rendering, but if you need a surface model and you don’t need to edit individual bones, etc. the Grayscale Model Maker might work for you.
Thanks for pointing this out @tsehrhardt - you are right, if somone needs a surface model with fine details, the Grayscale Model Maker can be better since it works by fitting a surface to the original continuous-tone input data, more like what you see in volume rendering, whereas labelmap-based segmentations first discretize the voxels and then reconstruct the surface.
If you need to subdivide the bone, you could use the Mask Volume with segments and then use Grayscale Model Maker.
This is probably the only time GrayScale Model Maker can work this effectively, because there is simply nothing to clean up at the segmentation step and a single threshold does the job. For scans with tissue or with other contents, a single threshold to model almost never works, and you have to rely on other tools in the segment editor to get a clean model.
