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Blending is used frequently in mechanical engineering designs. It permits:
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Chamfering or rounding sharp edges
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Adding a chamfer or fillet between two faces (e.g., adding material)
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Variable blending and chamfering (blend radius or chamfer size are not constant)
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The following example picks up where Sweeping example left off. In the sweeping example, a wire body consisting of linear edges was created. This is offset, creating another wire body that has rounded corners. This wire body is then swept into a solid. The blending example takes some of the edges of that solid and applies a constant radius blend to them, as is shown in figure 8-7.
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After creating the swept solid, defines the blend radius and assigns this to a list of edges. The list of edges,
my_list, is simply the list of edges obtained from the wire offset operation and then later used as the profile in sweeping. Either a single edge or a group of edges can have the blend attribute assigned to it. Once the edges have a blend attribute, the network of blend edges is passed into the
blend:network Scheme extension, which completes the blend.
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Note
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The blend:get-network Scheme extension is used to get all edges associated with a blend attribute from just one edge of the list.
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Scheme Example
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;--------- Copy of the Offsetting a Wire Body Example
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;--------- (below this line)
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; Define the positions to be used.
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(define my_point1 (position 0 0 0))
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;; my_point1
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(define my_point2 (position 20 0 0))
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;; my_point2
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(define my_point3 (position 20 10 0))
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;; my_point3
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(define my_point4 (position 0 10 0))
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;; my_point4
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; Create edge 1 as a sine edge.
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(define my_linear1 (edge:linear my_point1 my_point2))
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;; my_linear1
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; Create edge 2 as a linear edge.
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(define my_linear2 (edge:linear my_point2 my_point3))
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;; my_linear2
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; Create edge 3 as a spline curve.
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(define my_linear3 (edge:linear my_point3 my_point4))
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;; my_linear3
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; Create edge 4 as a spline curve.
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(define my_linear4 (edge:linear my_point4 my_point1))
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;; my_linear4
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; Create a wire-body from a list of edges.
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(define my_wirebody (wire-body
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(list my_linear1 my_linear2 my_linear3 my_linear4)))
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;; my_wirebody
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(define my_offset (wire-body:offset my_wirebody 5 "r"))
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;; my_offset
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(entity:delete my_wirebody)
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;; ()
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(define my_profile my_offset)
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;; my_profile
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; Create a list of edges for use later.
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(define my_list (entity:edges my_profile))
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;; my_list
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; Create a vector path for sweeping.
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(define my_vec_path (gvector 0 0 20))
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;; my_vec_path
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; Sweep the profile along this vector. Create it as a solid.
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(define my_sweep (sweep:along-vector my_profile #t
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my_vec_path))
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;; my_sweep
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;--------- Copy of the Offsetting a Wire Body Example
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;--------- (above this line)
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; Modify the model by blending all of the edges along
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; the base.
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(blend:const-rad-on-edge my_list 3)
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;; (#[entity 19 1] #[entity 23 1])
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(blend:network (blend:get-network (car my_list)))
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;; #[entity 19 1]
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; Save the results to an output file.
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(part:save "tmpblend1.sat")
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;; #t
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Figure 8-7. Blending Edges
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Some of the Scheme extensions related to blending solids are:
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blend:chamfer-on-edge
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Attaches a chamfer blend attribute to each edge in the input list.
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blend:complete
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Executes the third phase of blending.
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blend:const-rad-on-edge
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Attaches a constant radius blend attribute to each edge in the input list.
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blend:edge-info
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Lists the edge blend type and internal data values.
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blend:get-network
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Gets a list of all edges and vertices that are in the same blend network as the given entity.
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blend:get-smooth-edges
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Gets a list of all edges that smoothly connect to a given edge.
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blend:local
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Creates a blend in a nonmanifold body by adding faces locally around a given edge, blending the edge, and removing the added faces.
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blend:make-sheet
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Executes the first phase of blending which creates a blend sheet.
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blend:make-wire
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Executes the second phase of blending which creates a wire intersection.
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blend:network
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Creates blends on a list of edges and vertices that make up a single blend network.
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blend:on-vertex
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Attaches vertex blend attributes to each vertex in the input list.
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blend:remove-from-edge
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Removes blend attributes, if any, from the input edge.
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blend:remove-from-vertex
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Removes blend attributes, if any, from the input vertex.
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blend:var-rad-on-edge
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Attaches a variable radius blend attribute to each edge in the input list.
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blend:vertex-info
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Lists the vertex blend type and internal data values.
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edge:fillet
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Creates a fillet blend on two edge
entrays (entities with rays).
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solid:blend-edges
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Creates a cylindrical blend on a list of edges.
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solid:chamfer-edges
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Creates a chamfer blend on a list of edges.
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