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A
round blend refers to the surface produced by either of the following:
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Rolling a ball of constant or variable radius along an edge while keeping the ball in contact with the faces to either side of the edge.
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Rolling a ball of constant radius around a vertex while keeping the ball in contact with a face and an edge adjacent to the vertex.
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In general, the envelope of the rolling ball's path is represented by a spline surface. When possible, it is represented by a simple analytic surface. In either case, the surface is tangent to the two faces and has precise evaluators.
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Spring curves follow the point of contact between the pipe and the two faces. The portion of a pipe surface that lies between the spring curves is used to form the round blend face.
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Note
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The phrase between the spring curves refers to the portion of the surface with smaller arc length.
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Figure 1-6. Blend Face Between Spring Curves
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