Yeah, MeshLab is pretty great, but even so some of the features would be nice to have within FIJI to minimize program-hopping. We were talking about 3D a lot at the hackathon, much of which has been consolidated to this forum post
. It would be wonderful if you/BoneJ could weigh in on that thread. As you know there is code for STL/OBJ writing in 3D viewer at the moment , but one has to make very direct calls into classes to make it happen without going through a display step. The imagej-ops crew have been consolidating a ton of code into ops in a way that makes it very easy to use (and backed by IJ2/Imglib2), which is beginning to include geometry operations. There are a lot of things you all are ahead in, especially when it comes to 3D measurements, which might be a nuisance to port, but perhaps there are some core functions (mesh file IO for example) that could be migrated to more core ImageJ libraries so we can get rid of some duplication.