"X-Ray" Outlines in Blender Cycles (and Unity)? (and other shader-related questions)

Yikes

Yo, I'm trying to proof of concept some shaders in cycles for a game I'm working on, but I'm pretty illiterate to shaders and I'm curious about how I would achieve a certain effect

I'm trying to accomplish geometry outlines that X-ray through a specific material (without x-raying through other materials). the entire torso under the blue top is modelled and has geometry outlines, and I want the outlines to show through the top
pic related, the effect I'm going for, and an image with the blue top invisible to show the rest of the geometry




Trying to accomplish a pseudo-translucency effect in a cartoonish style, to make the blue top's material appear something like a sundress would.



Here's my node setup for the top



and outlines



if anyone has an answer to this question, let me know!

ALSO! I'd love to know how to accomplish an unmoving plaid effect in cycles and unity as well, like stan in tales of monkey island


also also; is there anyway to thumbnail images? first post, and I feel like the images here take up way too much real estate on this post 

Yikes

am I allowed to bump for attention

RN

Hi. The texture on that shirt seems to be mapped with screen \ window coordinates: instead of you mapping the shirt by hand to make UV coordinates with seams etc., you map it directly in your vertex or pixel shader based on the screen coordinates of the shirt pixels.

- https://docs.blender.org/manual/en/dev/render/cycles/nodes/types/input/texture_coordinate.html (the Window output of this node)

- https://docs.unity3d.com/Manual/SL-ShaderSemantics.html (search for "Screen space pixel position", done in the pixel shader)

- https://docs.unity3d.com/Manual/SL-ImplementingTexGen.html (some alternative formulas for making texture coords., like "object linear" (AKA triplanar mapping) and "view linear", both done in the vertex shader).

As for the outline under the coat, there are a few different ways to do it, from rendering things in passes to just stenciling it out of the coat (masking out the coat anywhere where there's a body outline).

https://docs.unity3d.com/Manual/SL-Stencil.html

Unity and Cycles will have different solutions. If you're designing some shader for Unity then it's best to work directly with it, unless you want to use something like FX Composer and then port your work to Unity later.