| 1, Start of by creating
your image. The size really doesnt matter, I used 400x200
to fit in here
2, Once you have got your workspace, make a rectangular selection,
just like the shape below.
3. Create a gradient, going from Light to dark and from dark
to light again. (Further down you will see another possibility).
Press ok, and using the shift key, make an horizontal straight
line across your selection. (on a new layer of course)
4, Now press CTRL+T , or (Edit > Free Transform), and
while holding, ALT+Shift+Control pressed (yes all three) move
the top left point to the middle. (you should see the top
right corner moving to the middle as well. Once they both
meet and form a cone you''re done.
So far so good...there is your spike. If you want to add
effects to make it looks even better, i made two examples
below, the wave and the glass effect.
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