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Fantastic work and the effect is sublime! Its simply crazy how much you did in 7 days. Curious how you achieved it - with the use of two cameras looking at two different sets, blending based on a noise cutoff texture, and checking with the same noise cutoff texture to see if your character is based on the dungeon or mall? This effect would be fantastic for game with a horror vibe - or maybe a Stranger Things crossover?

I like how killing the enemies cause them to become phone zombies IRL.

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Thanks! To get the effect - I made a created a custom alpha-cutoff shader that uses a custom perlin noise function that varies with time for the alpha. The dungeon version of the shader uses (1 minus noise) for the alpha. There are separate mesh renderers / game objects for the mall and dungeon versions of things, and just one camera. The mall and dungeon mesh renderers lie on different Unity layers, and the lighting and shadows that come from the mall or the dungeon is set to only affect things on its layers.

The shaders also had some triplanar shading so all I really needed to make mesh-wise for the walls were very simple block stuff and then let the shader do the work. For the dungeon, I then added some extra noise to the vertex function of the shaders that move the vertices consistently based on where they are in world space to give the walls added roughness/irregularity that still remains seamless across separate game objects.

I also made particle effect versions of the shaders for the lightning effect that comes from the smites so that the smite would show up only in the dungeon regions.

Having the shaders be GPU instanced shaders really cut down on the draw calls and helped performance.

The noise function is also replicated on the C# side so that each character/pickup knows whether it is in the mall or the dungeon when it comes to behaviour and collisions/triggers.

I'm glad you picked up on how the dead enemies from the dungeon became phone zombies in the mall! It's a subtle thing that some players didn't understand.