Extruding the image on a layer down the sides of an extrusion

Question

I have dozens of layers that each have hundreds of small shapes on them, each with various colors or patterns. I need to extrude these layers in 3D. But I need the colors around the edges of the shapes to be the color that goes down the extruded sides. Is there any way to do this? I can not edit the texture for each shape. There are hundreds of shapes on each layer, all different sizes and colors. This needs to be some automated thing. Basically I want the row of pixels that is around the edge of the shape to be continued down the sides of the shape when it is extruded.

(I'm using Photoshop CC v 20.0.2)

Here's a simplified example of what I want.

Chuck Uebele · Answer

Not sure how to do it easily, but you can zoom in and make a marquee the size of height of the stripe on the front face, then paint in along the edge the color you want. This will show you where to paint/fill on the extrusion texture diffuse layer:

The red I've done. You can see a small blue patch where I painted in the color, so you need to make a marquee on the diffuse layer and fill it. Not real convenient.

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