8

Editable Patch (Edge) 969
When the Edge sub-object level is active, the
Geometry rollout on the Modify panel has the
options listed below:
Subdivision group
Subdivide—Subdivides selected edges and the
associated patches. Select one or more edges, and
then click Subdivide.
Propa gate—When on, subdividing edges
propagates the subdivision to neighboring patches.
Propagating the subdivisions along all contiguous
patchespreventspatchcrackswhereyouhave
attached patches together. Turning off the check
box restricts subdiv isions to just the one or two
patches bordering each selected edge, and will
create cracks in the edges b etween these patches
and the surrounding ones.
Topology group
You can add Tri and Quad patches to any open
edge of an object. On closed objects like a sphere,
you can delete one or more existing patches to
create open edges, and then add new patches.
The new patches adapt to the existing geometry.
For example, when you add a patch to a curved
edge, the new patch follows that curve and
seamlessly extends it.
Add Tr i—Adds a three-sided patch to each selected
edge. Select one or more edges, then click Add Tr i
to add the patch or patches.
Original patch with edges selected (top) and three-sided
patches adde d (bottom)
Add Qua d—Adds a four-sided patch to each
selected edge. Select one or more edges, and then
click Add Quad to add the patch or patches.
Attach—Lets you attach a n object to the currently
selected patch object. Click the object you want to
attach to the currently selected patch object.
For further details, see
Attach .
Reorient—When on, reorients the attached patch
so that each patch’s creation local coordinate
system is aligned with the creation lo cal coordinate
system of the selec ted patch.