Polygons divide until the distance from a polygon edge midpoint to the NURBS surface is smaller than this value. Use for making sure the polygons are approximately the same size. The default value is zero and the usable range depends on the size of the model. Setting this value to zero turns off the option. Smaller values result in slower meshing and a higher polygon count with more equally sized polygons. This is also, approximately, the maximum edge length of the quads in the Minimum initial grid quads. Polygons are further divided until all polygon edges are shorter than this value. The value is always in the current unit system. Setting this value to zero turns off the minimum edge length option. Bigger values result in faster meshing, less accurate meshes and a lower polygon count. The default value for this option is 0.0001 units and the usable range depends on the size of the model. This is also, approximately, the minimum edge length of the quads in the Minimum initial grid quads. If any edge is shorter than the Minimum edge length, no further division of the mesh faces occurs. Control the smoothness of the mesh with other parameters. When shading long, skinny objects, use 0.0 for the this value. The default value for this option is zero and the suggested range, when not zero, is from 1 to 100. Setting Maximum aspect ratio to zero turns off the option. This is approximately the maximum aspect ratio of the quads in the Minimum initial grid quads. Smaller values result in slower meshing and a higher polygon count with more equilateral and nicely shaped polygons. 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. Surfaces are initially tessellated with a regular quadrangle mesh and then that mesh is refined. It will tend to make meshes denser in areas of high curvature and less dense in flatter areas. The Maximum angle setting will influence the meshing of objects of the same shape in the same way regardless of the size of the objects. Two vertices are neighbors if they are at the opposite ends of a single facet edge. If the angle between surface normals is greater than this setting, the mesh is further refined (more vertices are inserted) and the mesh is made denser. Sets the maximum allowable angle between input surface normals at neighboring mesh vertices. Larger values result in a mesh with a higher polygon count. Uses a formula to control how close the polygon edges are to the original surface. Polygon mesh detailed options | Rhino 3-D modeling Polygon Mesh Detailed Options
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