9

Editable Patch (Patch) 981
Geome try rollout
See Geometry Rollout (Patch) (page 1–986) for
detailed descriptions of these controls.
Editable Patch (Patch)
Selec t an editable patch > Modify panel > Expand the
editable patch in the stack display > Patch sub-object
level
Selec t an editable patch > Modify panel > Se lection
rollout > Patch button
Selec t an editable patch > Right-click the patch > Tools 1
(upper-left) quadrant of the quad m enu > Sub-objects >
Patch
A p atch is an area of a patch object, defined by
threeorfoursurroundingedgesandvertices.
Controls described in this topic let you manipulate
a patch object at the patch level. As well as moving
and rotating patches, you can create a separate
elemen t by holding down the
Shif t key during a
move operation. This creates a separate element
of the selected p atches.
Tex ture Ma pping Patches: Interpola tion
in Cur ved S pace
Patches can now be mapped in curved space; this
means simplified texture mapping for patches. A
planar map on a complex p atch object will not be
distorted. At the Patch sub-object level there is a
parameter in the right-click quad menu (Tools
1 quadrant) called Linear Mapping. If you leave
Linear Mapping off, then textures are interpolated
in curved space and behave much like texture
mapping a mesh object, predictably.
In the old method, patch mapping is interpolated
between the knot points. This works well with
procedural maps but not so well with bitmaps,
since each patch is linear in UV space.