In
the side view rotate your pattern 90 deg. untill it is planar to y axis.
Now
copy the pattern untill it reaches the same span as our pattern guide.
Now
switch layer selecting the pattern guide and partially selecting the created pattern.
Go
to multiply tab and perform drill, set to y axis and select stencil, assign material
other than the default one, in this case i selected the tire material.
In
polygon mode select all faces having the black material and delete, leaving the
reversed pattern.
Go
to the layer where our tire rest and partially select the layer of our created
reversed pattern.Select the tire wall and temporary hide them, we dont want the
pattern to project as well in the tires wall portion.
Drill
in y axis, select stencil and assign default for the surface and see the result.
In
the right viewport zoom in your tire and place your mouse in the middle of the
car's wheel (crossed red) and press r.The tire now is rotated 90deg.
Repeat
the drill operation...
Heres
the result.
Unhide
the tirewall by pressing \ and go to the next procedure.
Select
all projected faces and smooth shift and from the middle drag inward by using
stretch or the size tool untill you get the right depth that reveals the tires
grooves.
Tip:
Try using SelBySurface when selecting polys with the same surface to work faster.
Select
all and assign the tire surface.Go to the surface editor and assign smoothing
to the tire surface and put 30% to its threshold,lowering threshold will maintain
the tires grooves sharpness.