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Step 1: Lets get started. Find you car, and outline any existing opennings with the poly
lasso tool. This one was pretty easy because of the single, small opening.

Step 2: Create a new layer (Ctrl+Shift+N). Select the Brush tool with
a large head at 100% opacity and a soft edge. Find a color around the area you want to fill and brush over the old openings.
Find the colors that are closest to the area you're filling and bring the opacity down. Brush in everything
until it blends well with the car.

Step 3: Grab the poly lasso and start outlining a new opening for the center. Like I said, this
is not a perfect example, but it will give you the feel of what's happening. Create a New Layer (Ctrl+Shift+N)
and Fill (Shift+F5) it with black.
- If at this point you don't really like your new shape, you can transform this to make it a better fit since it is it's own
layer. ;)

Step 4: With the poly lasso create an outline to your new opening, keeping in mind the overall
perspective and your vanishing points. Create a new layer (Ctrl+Shift+N) and Brush
in this area. It's best to start with something light in the body color and work towards your darker shadows.

Step 5: Go through the same steps with the Poly Lasso tool to create any more parts that will
make up the interior part of the new opening. This one I Brushed really bright to match the highlights
on the bumper.

Step 6: Add as many new vents as you like, keeping mind the style of the car, and how the bodylines flow. I tried to
keep mine simple for explanation purposes. On these 2 outer side vents I'll start by outlining with the Polly
Lasso tool what I want one side at a time.

Step 7: Make a New Layer and fill this with black. Now since I want to make the side vent look
moulded in with the center opening, I'll make another outline with the Polly Lasso for some shadow
and fading, only worrying about the top and bottom edges.

Step 8: Create a New Layer. Send this new layer behind the previous layer by clicking Cntl + [, or just click on that layer in the layers menu and drag it down.. Use your Brush
with a darker color selected from the car, and create the shadows you want.

Step 9: I took a shortcut and duplicated my last vent layer. Moved it over and flipped it horizontal. It took a small
amount of transforming with the distort function to get the angle to look right for the new position.

Step 10: Repeat the process in step 8 to make you shadows on this side. Make sure that if your outline is overlapping
another layer, the layer you’re working on is underneath it (ctrl [ ). I used several colors
with the brush to get the highlights and shadows in this small space.

Step 11: Go to your very top layer on your layers menu, and pick the line tool (or the pen tool) from the tool menu.
Find a light color with the eydropper (holding down the Alt key). Go around the edges with 1 px thick lines. You might have
to choose different colors along the way to make them blend right. The goal is to make a believable highlight to add some
dimension to your flat edges. In the end, I also merged all the line shape layers to one layer and use the eraser to help
blend just a little more. If you use the pen tool for this, you can add anchor points along the way to get smoother radiuses.
(Use the pen tool only if you are familiar with it's functions, otherwise stay with the line tool.)

Now you can add intercoolers, lights, grill mesh, license plates, or whatever else you want to add to complete the look you're
trying to achieve. I brushed in a front lip and lowered it too.

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