Unreal Engine 5 Tech Demo, [UE5 Developer Availability 2022-04-05]

Excessive geometry is the new ray traced reflections in your face as a "cheap" effect to wow casuals. I hope artists don't go crazy, this makes no sense

 

The latest incarnation of primitive shaders is another term for mesh shaders.

 

I guess detail is proportional to resolution. If they're planning on limiting the polygons to one per pixel, then increased resolution would be increased polygon counts.

 

I hope they do actually. Not necessarily through Nanite approach though.

Not sure that this is correct.
Note that PS5 doesn't support mesh shaders but do support primitive shaders.
Primitive shaders do run on RDNA2 but they are not the same thing as mesh shaders.
AFAIU primitive shaders are about geometry culling while mesh shaders are about geometry processing.

 

it's really a testament to how effective their compute shader setup is at culling triangles. Something that the hardware path cannot do.
This is really important for sure, to be able to do something like this, even on machines that don't support mesh shaders.

 

That's exactly what they are trying to do. Another side effect of this is that needed ssd bandwidth is likely directly tied to resolution used. 4k probably needs 4x data from ssd compared to 1080p.

 

True. I did not mean they were synomous but had some similarities in common. Based on this read mesh shaders seem to offer more flexibility regarding programmability.

Primitive Shader: AMD's Patent Deep Dive | ResetEra

 

I'm getting really noticeable artifacting around the character when in motion. Looks like ghosting from the TAA or motion blur implementation.

Has anyone been able to package the demo as a standalone executable so that it’s runnable outside the editor?I’m getting an error that the SDK isn’t installed properly whenever I try.

 

Just playing around with nanite

What nanite can drive vs "traditional" mesh with lods

 

That propagation update delay is going to be noticeable all generation.

 

It doesn't seem to be very effective at culling, culling time is the same with both r.NaniteComputeRasterization and r.NanitePrimShaderRasterization, but rather compute rasterization part is way faster at rasterizing triangles with sizes less than 4 pixels with r.NaniteComputeRasterization and roughly equal to HW rasterization at r.Nanite.MaxPixelsPerEdge=4, then it starts losing to r.NanitePrimShaderRasterization at larger triangles, which is supposedly rasterization path.
That's all for the 2560x720 rendering resolution (slightly below 1080p in pixel count), default setting for this resolution is r.Nanite.MaxPixelsPerEdge=2, this would translate into 8 pixels per edge in 4K, so raster still can beat it in this resolution with such settings. Not sure whether classic rasterizer part is optimized in UE5 to the same extent as compute rasterizer. I have tried NVIDIA's mesh shaders Asteroids demo recently (without some fancy optimizations) and it was capable of rasterizing 300 millions of polygons of overlapping asteroids meshes at 4K with 30 FPS, in wireframe mode there were a few meshes with holes, but otherwise the screen was mostly opaque (close to per pixel density)

 

Did someone run it at 720p upscaled to 1080p to see how their upscaler upscaler looks, and how the performance scales?

 

Nanite vs lod0 Mesh from close up and further away




Very impressive! Even for games that don't want to use billions of polys this will be nice as you can just use lod0 and let nanite handle the rest (for static meshes).

 

It so annoys me I'm already trying to think of clever ways around it

Course in this case I haven't even figured out how lumen does its updating, so...

As a guess this could be the screenspace GI they use for filling in holes and detail. The same can happen in Days Gone when that's enabled. Little pools of darkness going along with moving objects maybe, or am I totally off?

 

It's the Gen5TAA aka Temporal Super Resolution. If you switch to old TAA (r.TemporalAA.Algorithm 0) the ghosting stops.

 

I guess for those particles it's all screenspace, so to reduce lag you'd want to prefer spatial over temporal sampling.
AFAIK, this is from Path Of Exile dev and he generally tries to do so:
...while Epic may tend more towards the temporal way.

 

Not sure if this is of interest to anyone here or has been brought up before but I think the Nanite renderer uses a visibility buffer approach to deferred rendering ...

 

This engine does make me wish that CIG went with unreal instead of cryengine. This stuff would have worked great in space giving a ton of detail to the ships which is mostly what you see out there and the ability to get really detailed on the planets too.
Oh well

I await the first games using this

 

SC is all about wishes.

It does make me wonder how you'd build planetary tech to make the most of Nanite though.