Document Properties: Mesh

Manage the mesh settings for the current model.

Whenever you shade or render a NURBS

surface, the surface first converts into a polygon mesh. These detailed render mesh options control the way in which the NURBS surfaces convert to polygon meshes.

You may want to adjust these values if you are not satisfied with the default shade and render quality.

Jagged & faster

Objects may look jagged, but they should shade and render relatively quickly.

Smooth & slower

Objects should look smooth, but they may take a very long time to shade and render.

Custom

Set the custom options.

Custom options

Uses a formula to control how close the polygon edges are to the original surface. Values between 0 and 1. Larger values result in a mesh with a higher polygon count.

The maximum allowable change between the surface normal at any point and the mesh vertex. Two vertices are neighbors if they are at the ends of a facet edge.

The default value for this option is 20 degrees and the suggested range is from 5 to 90 degrees.

This setting is scale independent.

Smaller values result in slower meshing, more accurate meshes, and higher polygon count.

Application: When you are meshing surfaces that have flat and wiggly regions and you want fewer triangles in flat regions and more triangles in wiggly regions, then use Maximum angle and set Maximum edge length to 0.

Surfaces are initially tessellated with a regular quadrangle mesh and then that mesh is refined. The initial quad mesh is constructed so that on average, the maximum aspect ratio of the quads is less than or equal to Maximum aspect ratio.

Smaller values result in slower meshing and a higher polygon count with more equilateral and nicely shaped polygons. Setting this value to zero turns off the option. This is approximately the maximum aspect ratio of the quads in the initial mesh grid. Setting Maximum aspect ratio to zero turns off the option. Zero means no limit.

The default value for this option is zero and the suggested range, when not zero, is from 1 to 100.

This setting is scale independent.

Application: When shading long, skinny objects, use 0.0 for the this value. This allows infinite ratios. Control the smoothness of the mesh with other parameters.

If any edge is shorter than the Minimum edge length, no further division of the mesh faces occurs. This is also, approximately, the minimum edge length of the quads in the initial mesh grid

.

The default value for this option is 0.0001 units and the usable range depends on the size of the model. Bigger values result in faster meshing, less accurate meshes and a lower polygon count. Setting this value to zero turns off the minimum edge length option.

This is also, approximately, the minimum edge length of the quads in the initial mesh grid

.

This option is scale dependent.

The value is always in the current unit system.

Polygons are further divided until all polygon edges are shorter than this value. This is also, approximately, the maximum edge length of the quads in the initial mesh grid

.

Smaller values result in slower meshing and a higher polygon count with more equally sized polygons. Setting this value to zero turns off the option.

The default value is zero and the usable range depends on the size of the model.

This option is scale dependent.

Application: Use for making sure the polygons are approximately the same size.

Maximum distance, edge to surface

Polygons divide until the distance from a polygon edge midpoint to the NURBS surface is smaller than this value. This distance is also the approximate maximum distance from polygon edge midpoints to the NURBS surface in the initial mesh grid

.

Smaller values result in slower meshing, more accurate meshes, and a higher polygon count. Setting this value to zero turns off the option.

The default value is zero and the usable range depends on the size of the model.

Application: Use as a general polygon mesh tolerance setting.

The number of quadrangles per surface in the initial mesh grid. In practice, Rhino will use at least this many polygons on each surface.

Bigger values result in slower meshing, more accurate meshes and a higher polygon count with more evenly distributed polygons. Setting this value to zero turns off the option.

The default value is 16. The suggested range is from 0 to 10000.

This option is scale independent.

Application: Use to make sure that surfaces with very subtle details are meshed with a high enough polygon count.

After its initial meshing, Rhino uses a recursive process to refine the mesh until it meets the criteria defined by Maximum angle, Minimum edge length, Maximum edge length, and Maximum distance, edge to surface options.

The mesh is refined until the angle between surface normals along a polygon edge is smaller than this value. The default is 20 degrees and the suggested range is from 5 to 90 degrees. Setting Maximum angle to 0 turns off the option. Scale independent.

No refinement results in faster meshing, less accurate meshes, and lower polygon count. Clearing this checkbox also means untrimmed individual surfaces and surface areas away from trim edges and joined edges are meshed with evenly sized quadrangles.

All surfaces mesh independently and Rhino does not stitch the edges of joined surface edges together. Meshes for each surface in a polysurface do not necessary meet to form a watertight mesh.

If Jagged seams is not checked, watertight meshes are created.

This causes faster meshing, a lower polygon count and cracks between joined surfaces in the rendered image.

Application: Rhino does not support watertight quadrangle meshes unless you are meshing a single untrimmed surface. In this case, clear Refine mesh and use Jagged seams to generate quadrangle meshes.

All planar surfaces are meshed by meshing the surface edges and then filling the area bounded by the edges with triangles.

Causes a slower meshing and a minimum polygon count on planar surface, especially for complex trimmed surfaces.

If Simple planes is selected, the settings, except Jagged seams, are ignored for planar surfaces and the planar surface is meshed with as few polygons as possible.

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