Rhino model was exported as polygon mesh as polylines and polygon mesh options are at the highest number. Model was imported into zbrush from import tool menu. Model looks great on the screen, however when I use a simple or clay brush it creates facets on the surface and does not work as usual. I resized the model in rhino about 3 times normal size and tried again. Same thing happened. How can I fix this?
thanks,
John
Rhino exports tessillated meshes. If you want to import a model from rhino and use it as a sculpting base, then pretty much the only thing you can do is to retopo the mesh. If you divide a rhino generated mesh, it doesn’t hold its edges and bloats and distorts. You can divide with the smooth divide button turned off. If you divide it 2 0r 3 times with smooth off, then turn smooth on and divide more, then you can end up with a decent mesh, but will have all sorts of pole pimples and smoothing them out is a bitch.
Rhino meshes are ok if your model is a hard surface, but if you plan on doing any radical changes, you will be pulling your hair out in short order. Import your model, do a quick retopo, and have at it.
I import rhino meshes all the time. Rhino is a big component in most of the design pipelines used in film design, and often am asked to rejigger a model which inevitably leads me back to Zbrush, which is the core of anything I do digitally.
That is my 2 cents. Good luck!
Carver
Oh yeah, duh…You can import your model and dynamesh it! I just did this on a bunch of rhino imports that needed tweaking before going to 3D printing.
Import your model, if feasible do the divide with smooth off a few times, divide a few times with smooth on, as you will want the poly count to be on the high side.
Duplicate the model in the subtools drop down. make sure you then select the duplicate in the subtools, so you have the original model to use should you need a target to use the project all option.
With the second mesh selected, delete lower levels, then dynamesh with the resolution slider cranked all of the way up, with the reproject and polish buttons on. yo will end up with a dense mesh, but one that Zbrush will play nice with.
Sometimes the new dynamesh will lose some of the detail, and sharp edges. If this is the case, then hit the project all button. Depending on the complexity of the model, you might divide the dynamesh one time and then do project all.
Hope this isn’t too confusing.
Best
Derek Pendleton
I am now having difficulty when going from zbrush back into rhino. I am exporting as an OBJ and rhino opens it just fine. I am needing to do a boolean difference from my model and a Rhino created cylinder of a precise diameter to make a ring for piece of jewelry. I plan to cut it on my cnc. The cylinder needs removed from the center of my zbrush model so it can form a hole for a finger to pass through. The boolean operation does not recognize the zbrush import’s polygons. Any work arounds?
thanks,
John
Are you using a solid object to do the boolean? It won’t work. Make a mesh cylinder. If that doesn’t work, you may need to resort to another app. Rhino is great at doing boolean operations on things generated in rhino, but the mesh density of an object coming out of zbrush, even decimated is tricky at best. Also, try exporting the object as an .STL file out of Zbrush, (stl export in the plugins drop down.) That tends to work better than an obj file when imported into Rhino.
I tried the cylinder as a mesh, there was no noticeable result. with the stl export, model was a mess afterwards. Ideally I was planning to use Rhino as a method of making precise holes after modelling in zbrush, in part so I could mechanically attach the models after “printing” them for jewelry and prototypes. Sort of like a model kit would fit together. Do you know of any way this could be achieved? As you’ve stated maybe via another program other than Rhino.
John
Instead off using boolean operation, try and use the mesh_boolean with the importen obj. Leave the obj A’s a Mesh and make
a cylinder in rhino(polysuface). Remember to decimate befordr exporting put off zbrush.
thanks for the tip!