Go to 3D > Repoussé > Selected Path. You’ll need Photoshop Extended (not the regular version) to get access to this menu. The 3D Object Rotate Tool should already be selected. Just click and drag in the document window to rotate the Diagonal bars like shown in the image below.
Set the Lights to CAD Optimized then adjust the Depth to reduce the thickness so that you get something like the next image below.
Here’s what the diagonal bars look like after applying the settings above.
Go to Layer > Layer Style > Gradient Overlay. Set the Blend Mode to Overlay, Gradient to Spectrum, and Scale to 150%. Don’t click OK yet.
Adjust the Angle setting so that your gradient is aligned with the direction of the diagonal bars like shown in the image below.
Click and drag directly on the image to reposition the gradient so that your gradient goes from blue to pink.
Click on the Color Overlay option to enable it. Set the Blend Mode to Overlay and color to pink (#FF7F7F). Click OK to apply the changes.
Now we’re going to rasterize the 3D object to speed up Photoshop’s performance for the edits we’ll be doing next. Before we rasterize the layer, set the render quality to Ray Traced Final. You can do this by going to Window > 3D to bring up the 3D palette then changing the Quality to Ray Traced Final. This will improve the edges of the 3D.
You’ll see a blue grid scanning across the image. This is Photoshoph rendering the 3D scene and may take a few minutes or more before it starts to look good. You can stop it when it looks fine enough for you. If you click or do anything inside Photoshop while it is rendering, the rendering will pause. To resume it, just go to 3D > Resume Progressive Render.
After rendering, your 3D object should have sharp lines and smooth shading like this:
Go to 3D > Rasterize to rasterize the layer then, in the Layers palette, move the layer below the girl.
Press Ctrl+G or Command+G on a Mac. This will put the current layer into a group. While holding down the Alt or Option key on a Mac, click and drag like shown in the video below to duplicate and reposition the 3D diagonal bars.
You’ll get a bunch of layers inside a group. Rename this group to “3D Diagonal Bars”.
Make sure you have the 3D Diagonal Bars group selected. Select the Move tool then position the 3D diagonal bars to anywhere you like. Here’s where I placed mine:
Next, we’re going to adjust the brightness and contrast of the 3D diagonal lines. As you might have guessed, we can do this with the Brightness/Contrast tool. But there’s a problem; it would be tedious to apply it to each layer inside the group and merging them together isn’t the best idea. Instead, we’re going to convert it to a Smart Object. That way, we can use the layer as a clipping mask for the Brightness/Contrast adjustment layer. You’ll see how this works in a second.
Make sure you have the 3D Diagonal Bars group selected then go to Layer > Smart Objects > Convert to Smart Object.
Now go to Layer > New Adjustment Layer > Brightness/Contrast. A New Layer window will appear. If you don’t see this, make sure that you are creating the new adjustment layer from the menus and not from the Layers or Adjustments Palette. Checkmark the “Use Previous Layer to Create Clipping Mask” option then click OK.
You should now have a Brightness/Contrast adjustment layer above your 3D Diagonal Bars layer. Notice how the adjustment layer has an arrow pointing to the layer below? This means that it is only affecting the layer below. It does this by using that layers transparency as a layer mask.
In the Brightness/Contrast settings, checkmark the “Use Legacy” option then set the Brightness and Contrast to 50. If you don’t see this, go to Window > Adjustments.
Change the blending mode of this layer to Luminosity. This blending mode prevents the Brightness/Contrast layer from altering the colors.
Here’s what the image looks like so far.