![]() Segmented Line Draw a line out of segments, the segment remain separate.Polyline Draw a line out of segments, the segment remain attached.Lines can be used as construction lines for other geometry or as input for surfaces. The main difference is that a line is always straight, a polyline can contain curved parts. There a two different line types used in Rhino: Points can be created one-by-one or in grids/clouds. Therefore it will not be visible in the render/shaded mode. A point itself has no dimensions, only a location. Points can be very useful to point out locations in your model or act as reference point for other types of geometry. In Rhino it is possible to draw various types op 2D objects: The options of drawing 2D objects are extensive. A plugin called Grasshopper was developed to explicitly make these parametric connections. Because Rhino only has a limited support of history, any changes in the curves will not always translate to the geometry made by those curves. When you want to generate 3d NURBS geometry you often start with the definition of a set of curves and from those curves you can generate the 3d geometry. There are the pulldown menu's, the command line and the toolbox. We have seen, in the introduction, that there are three methods of accessing the commands in Rhino. The result of this focus is that the interface of Rhino is quite straight forward. That means that it is developed for generating geometry. They are in fact the curves where the surface is based on, but are part of the surface itself. The ISOPARMS are the sets of crosswise angled curves on the surface. We have already found out that the NURBS surface contains ISOPARMS. The NURBS surface contains several different components. The more ISOPARMS on a surface, the more vertices are generated to deform the surface OR the higher the degree of the curves, the more vertices will be generated per ISOPARM and surface as a whole. Selecting and moving a vertex on a surface will basically deform the ISOPARM causing the surface to deform. The ISOPARM will behave almost the same as a Bezier curve. These curves on the surface are called ISOPARMS. Resulting effect is that the surface can support two different degrees, one in each direction. The geometry itself can be seen as a combination of two sets of "parallel" curves placed at a crosswise angle, with the mesh defined between the curves. The surface supports the same use of weighted vertices to define the curvature and shape of the geometry. Parts of the geometries topology is comparable with the Bezier curve.
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