9

768 Chapter 8: Modifiers
3.
Use the Modify panel to select the top
four vertices in the second box. Move them
upward in Z, making the copied box taller than
the original.
4. Apply Preserve, and pick the first box as the
original.
The selected vertices move down to match the
original edge lengths.
5. Set Iterations to 0 to mov e the vertices back up,
then turn on Invert Selection, and set iterations
back up to 25.
The selected vert ices stay in their original
locations, but the unselected vertices move
upward to restore the original edge lengths.
6. Turn Iter at ions b ack dow n to 0.TurnonApply
To Whole Mesh (Invert Selection b ecomes
unavailable), and then turn Iterations back up
to 25.
Preserve is now applied to the w hole mesh.
Sinceallverticesareaffected,thetopand
bottom of the box approach each other.
7. Turn off Apply To Who le Mesh .
All vert ices are tr anslated, but maintain the
same positions relative to each other.
8. Turn off Invert Select ion and turn on Selected
Ve r t s O n l y.
You’re back to the ori ginal effect. You can move
the Iterations spinner up and down to see that
you ’re affecting only the selected vertices.
Ex ample: S imulat ing cloth:
1.
Reset the program, create a Quad Patch Grid,
and convert it to an editable mesh.
2. Makeacopy,andthenmakeareferenceofthe
copy.
You should have a total of three objects i n the
scene.
3. Apply Preserve to the third patch, using the
first as the original.
4. Select Selected Verts Only and Invert Selection.
5. Set Iterat ions to 100.
6. Selectthesecondpatchandgotothe
Sub-Object > Vertex level.
7. Select a single vertex in the middle of the pa tch
andmoveitupwardinZ.
The third patch becomes a floating
handkerchief.
8. Undo the vertex move.
9. Selec t the far two corner vertices of the second
patch, and drag them upward in Z .
Now, you’ve got the beginnings of a sheet
hanging on the line.
Interfa ce
Original—Displaysthenameoftheselected
original object. (Note that the so-called "original"
object doesn’t actually have to be the original.
It’s simply a copy of the object that represents its
unmodified topology.)