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TOPIC: Ray Tracing possible with reshade ?

Ray Tracing possible with reshade ? 3 months 3 weeks ago #1

Ray Tracing seems to be the new thing in game graphics demos, so i was just asking my self, is it possible to make raytracing shaders like ray traced ambient occlusion ? I don't have any knowledge in shaders but i think it's possible with depth access.
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Ray Tracing possible with reshade ? 3 months 1 day ago #2

The depth buffer only gives you information on things that are visible to you, so you wouldn't be able to ray trace from sources that are off screen or behind geometry and the depth buffer also won't tell you how far back an object goes, if you can see only the front of a train, then it may as well be a cardboard cutout unless you assume every object goes on infinitely into the distance or has just a set depth for everything and even then the only color information you have is the edge of the visible area.

On top of that, to make ray tracing work you would basically have to code your own 3D engine in reshade (which it's obviously not designed for) that converts the entire depth buffer back into geometry and then simulate at least twice as much geometry as you have pixels on your screen using physics to shoot a ray from every pixel and likely more than that so you can get more samples, even if you lowered the resolution of the rays.

You would also not be able to get the surface's texture information as in how glossy, rough, reflective, transparent which is vital to knowing where to send the ray, though I suppose you could just do everything the same and give it a sort of Toy Story look.

So yes, technically possible with some major problems and probably years of work, but I don't think your computer will run it very well

(note I don't know how to code shaders, I'm just speaking from the knowledge and experience I have)
Last Edit: 3 months 1 day ago by ChrisXPZ.
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Ray Tracing possible with reshade ? 3 months 1 day ago #3

Ray tracing using the new technologies (Nvidia RTX, Microsoft's DXR), no. But this term is encorporating a LOT of applications.
Following virtual positions and checking reconstructed view positions against that is surely possible (screen-space raytracing). My work in progress screenspace reflections shader does that and I wrote an AO shader that does that as well - all on ReShade:

Warning: Spoiler! [ Click to expand ]

Then, creating a virtual scene like on shadertoy and creating a custom ray tracer, also possible. But "real" raytracing (what you refer to) requires the entire scene and access to more than just color and depth buffer. Most of it isn't even done in shaders.
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