9

994 Chapter 9: Surface Modelin g
Inter face
AutoGr id—Uses surface normals as a plane to
create patches. Click a pat ch type and then click
and drag the cursor over a face in the viewports.
Detailed information about the two patch grid
typesisavailableinthesetopics:
Quad Patch (page 1–994)
Tr i Patch (page 1–995)
Qua d Pa tch
Create panel > Geometry > Patch Grids > Q uad Patch
Create menu > Patch Grids > Quad Patch
QuadPatchcreatesaflatgridwithadefaultof36
visiblerectangularfacets.Ahiddenlinedivides
each facet in to two triangular faces for a total of
72 faces.
Quad Patch
Procedures
To cre ate a pa tch g rid:
1.
On the Create panel > Geometry > Patch Grids
> Object Type rollout, click either Quad Patch
or Tri Patch.
2. Drag over any viewport to define a length and
width for the patch.
To edit a Quad Patch:
1.
Select a Quad Patch.
2. On the Modify panel, right-click Quad Patch in
stack view and choose Editable Patch.
The Quad Patch collapses to an Editable Patch.
3. On the Editable Patch Selection rollout, click
Ve r t e x .
4. In any viewport, select a vertex on the patch
object,andmovethevertextochangethe
surface topology.
Vertices and vectors can be animated with an
Editable Patch mo difier.
Atthesub-objectEdgelevel,youcanaddpatches
along any edge. You can create complex patch
models b eginning from a single patch.
An ear is c reated by adding patches and editing patch vertices