This type of rounding allows creation of advanced blend surfaces.
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When processing a smooth chain of edges in this mode, make sure the radii are equal at the meeting ends of the adjacent edges. In the smooth case – the change in the radius is specified by a curve having a horizontal tangent at the start and end points.Ī special mode is provided for processing certain cases, that allows specifying own variable rounding parameters for each individual edge. In the linear case, the change in the radius is described with a broken line (the radius changes linearly from one point to another). The change in the rounding radius between points can be linear or smooth. When defining this type of blending along a closed loop of edges, always make sure that the start and end point radii are equal. It is defined by the direction of the first edge in the chain. A single direction is used for the whole chain of edges. The edge joints are not required to be smooth. If several edges are selected, then the point positions are defined as percentage of the total chain length for all consequently adjoined edges. Initially, this list contains two points at 0% and 100% of the edge length. Each point position is defined as percentage of the total edge length. A certain value of the rounding radius can be set at each of these points. This type of rounding creates a surface of a variable radius. Otherwise, rounding will fail and the system will output an error. The rolling ball must be touching at least one of the adjacent faces. The operation may add or remove material, depending on whether the angle between the faces of the blending edge is convex or concave. Complex spline surfaces may be constructed to join multiple edge blends. The surface may be defined in a single or multiple passes, particularly, if different edges are rounded with different radii. The trace of the ball represents the blend surface for the given edge. To easily realize how the rounding surface is generated, imagine a ball of the specified radius rolling along the selected edge, touching the faces adjacent to the edge. A condition holds that any normal cross section of this surface with respect to the edge is an arc of the specified radius. A surface is created along the selected edge, providing a smooth transition from one face to the other. Rounding is a most commonly used type of blending. According to an agreement, the surface on the right-hand side of the edge, as looked in the arrow direction, is conventionally called the first blend surface, and the one on the left-hand side – the second. Other blend-defining conditions depend on this direction. Otherwise, if a specific edge were selected that would later disappear, then the system would output an error.Įach selected edge has a direction indicated by an arrow. If topology of the selected object changes (for example, the number of edges changes), the operation will be correctly regenerated with the new set of edges of the involved object. This way of selecting brings the advantage of having a quite robust operation. In this case, the set of edges to blend is built anew at each regeneration. Thus, in case a face was selected, a reference to this face is recorded in the model tree. These original elements selected for blending are remembered in the model history. It is very important to understand how the information is maintained about the original elements subjected to blending. Selecting a solid automatically makes selected all its edges appropriate for blending.
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Selecting a face results in selection of all its surrounding edges (single or multiple loops). Selecting a loop by the definition means selection of the sequence of edges making this loop. Thus, for instance, by selecting a vertex, we select all the edges meeting at that vertex. This helps selecting certain common combinations of edges. The set of the automenu options allows selection of various objects, besides the edges, such as loops, faces, vertices and operations. Additionally, some vertices may be selected on the involved edges in order to specify particulars of the intended shape. The object of the edge blending operation is the edges of the sheet or solid body. In the edge blending operation there is a special diagnostics mode available which allows a user to promptly estimate possibility and causes of error appearance. variable-radius rounding (circular, elliptical).Īs the result of the operation, the edge where two faces meet is replaced by an additional surface (the blend surface) providing the required transition from one face to the other. Blending can be performed on both solid and sheet bodies. The edge blending operation makes transition between two or more adjoining surfaces belonging to one solid body.