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Rhino Mesh Settings

A brief overview of Rhino's custom meshing settings and how they work

Note: For the sake of clarity, I have condensed the original page to a quick overview of the custom mesh settings. For people who want to know more, the detailed explanations are still available, they can now be found on this page. –Mitch 16.01.2013

Accessing the Meshing Settings

The controls for the Render Mesh (display mesh) settings are part of the .3dm file's properties; they can be reached via (File > Properties > Mesh or Tools > Options > Mesh).

They are generally set globally for the whole model, but from V4 on, you can also override them on a per-object basis via the Properties panel.

Rhino offers you 2 standard settings, Jagged and Faster and Smooth and Slower, as well as Custom, which lets you access the detailed controls.

The Standard settings

  • Jagged and Faster is the default for render meshes — fine for general visualization purposes.
  • Smooth and Slower offers better resolution at the expense of longer meshing times.
  • (In V4, the smooth and slower setting did not work that well, in V5 it works better!)
  • Custom allows the user the maximum flexibility in tailoring the mesh settings to their needs, at the expense of being a bit more complex to understand and set up.

The Custom Settings

If you really want to control your meshing process, here is where you need to start!

When you check Custom in V5 you are first presented with a simple slider controlling the Density setting. Moving it to the left will result in a fewer polygons and a coarser mesh, to the right in more polygons and a finer mesh.

If you then push the Detailed Controls button, it will reveal all the other “granular” controls that will allow you to completely control the process. In V4, the granular controls are presented directly; the Density setting is not available as a slider.

There are seven numerical settings and three check boxes. Each one has a different method of mesh control and some of them can work together. The interactions and combined effects of these settings are complex to understand. Individually they are well described in the Help however, and reading this info carefully will give you a good idea of what each one does.

A copy of the Rhino Mesh Help page can also be found here.

Please read the companion page to this one for detailed meshing info

Below is a basic start point for custom settings, you will need to do some experimentation with them on your models. If a setting is 0 or 0.0, it is turned off (not taken into a account).

Density 0.0
Maximum angle 35
Maximum aspect ratio 0.0
Maximum edge length 0.0
Maximum distance edge to surface see below
Minimum initial grid quads 16

Refine mesh checked
Jagged seams unchecked
Simple planes unchecked

  • The maximum angle method forces more triangles in sharply curved areas. This way small features that fall below the max distance number will be subdivided a little. You may be able to get away with a little bigger max distance number letting the angle setting take over for the smallest objects/features.
  • The maximum distance edge to surface method forces Rhino to create a mesh that is no further away from the surface than the specified value, which is in current file units. It allows Rhino to put fewer polygons in lower detail areas and more polygons in higher detail areas, resulting in a more efficient mesh.
  • The minimum initial grid quads setting makes sure the flatter areas have enough polygons to look smooth.

The most important setting here is max distance edge to surface. This value is in file units and is scale (size) dependent - that means you will need to adjust it for the size and level of detail of the objects you model.

The setting will depend on what you're going to be using your mesh setting for. For general display purposes your value can be a bit bigger (coarser), as you're only visualizing the model on your screen, and less polygons mean faster meshing times and quicker display reaction when tumbling, zooming, etc. On the other hand, if you need to have more accurate meshing on very fine details for a hi-resolution render (or for manufacturing, perhaps), the value will need to be smaller (finer).

  • If you are doing toaster oven sized objects, 0.01mm (.0005 in.) generally works out pretty well.
  • For small highly detailed objects such as watches and jewelry, try something less, maybe .002mm (.00001 in).
  • For big objects like buildings, it can be much larger, maybe 0.1 to 1mm (.005 to .05 in) or more.
  • If you're going to be exporting your object for later process
    rhino/meshfaq.txt · Last modified: 2015/05/21 (external edit)