OOF2: The Manual

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Description

Pin internal boundary nodes. Internal boundaries lie between regions of different pixel categories in a Microstructure.

Pinning internal boundaries is especially useful when cleaning up a Skeleton that has been adapted to the material boundaries of a Microstructure. Figure 6.58(a) shows a Skeleton with pinned internal boundary nodes. Figure 6.58(b) shows the same Skeleton after having been smoothed. The pinned nodes have not moved, although the targets parameter for Smooth was set to AllNodes.

Figure 6.58. Pinning Internal Boundary Nodes

(a) Before, and (b) after smoothing a Skeleton with pinned internal boundary Nodes. The pinned Nodes are marked with yellow dots.

Note that Nodes on internal boundaries in a Skeleton do not necessarily lie exactly on the pixel boundaries in a Microstructure. A Node is considered to be on an internal boundary if it is part of two Elements with different dominant pixels. Figure 6.59(a) shows a detail from Figure 6.58(a) where the pinned Nodes are clearly not on the pixel boundaries. When the Elements are colored according to their dominant pixels as in Figure 6.59(b), it is clear that the pinned nodes are actually boundary nodes of the Skeleton.

Figure 6.59. Detail of Internal Boundary Nodes

A detail of the smoothed Skeleton in Figure 6.58(b).

(a) When viewing the Image and the Skeleton edges, it is apparent that the pinned Nodes are not necessarily on the pixel boundaries …

(b) … but when the Elements are filled by their material color, the pinned nodes are seen to be on the Skeleton boundaries.

See Also