Boundaries of Face Blend

By specifying the blending boundary, one can unambiguously determine the position of the contact line on specific sections of the blending surface. This is necessary to take into account the edges of the faces when constructing the blend surface, when the blend surface goes beyond the edges of the blended faces. In this case, this option allows you to bring the blend surface to the edges of the faces with automatic calculation of the size of the blend surface.

Following boundary conditions are available in the Face Blend command:

Two-Face Tangency

This type of boundary condition setting is used, when the blend surface, which follows the blended faces edges as a boundary, locally tends to have a smaller blend size than that specified by a user. In other words, in this case the blend surface locally overlaps the edges of the faces.

If two-face tangency is set, then the opposing contact line of the blend surface is modified symmetrically.

One-Face Tangency

This type of boundary condition setting is used, when the blend surface, which follows the blended faces edges as a boundary, locally tends to have a smaller blend size than that specified by a user. In other words, in this case the blend surface locally overlaps the edges of the faces.

If one-face tangency is set, then the opposing contact line of the blend surface is not disturbed and follows the law, described by surface parameters.

Two-Face Inverted Tangency

This type of boundary condition setting is used, when the blend surface, which follows the blended faces edges as a boundary, locally tends to have a bigger blend size than that specified by a user. In other words, in this case the blend surface locally doesn’t reach the edges of the faces.

If two-face inverted tangency is set, then the opposing contact line of the blend surface is modified symmetrically.

One-Face Inverted Tangency

This type of boundary condition setting is used, when the blend surface, which follows the blended faces edges as a boundary, locally tends to have a bigger blend size than that specified by a user. In other words, in this case the blend surface locally doesn’t reach the edges of the faces.

If one-face inverted tangency is set, then the opposing contact line of the blend surface is not disturbed and follows the law, described by surface parameters.

Cliff-edge Blend

This type of boundary condition setting is used, when the blend surface constructed by user defined size overflows the face cliff edge. In this case the blend surface is constructed without distortions in such a way that the blend surface cross section curve spans between the face on one side and the cliff edge on the other side, keeping the guiding rule of the cross section shape.