[GAUGING INTEREST] AAA Grass

[Maximum-Dev]

Post updated:

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Package intro and description

 

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Example setups:

 

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Performance test:

 

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Running on a GTX 970 @ 1080p

https://youtu.be/Lh1ucyEUJIE

Other products:

[Ironbelly]

The thing that really matters most with grass is how it's optimized give that UE4 still uses crapped deferred rendering and not forward. Can you give some stats on resource consumption and optimization strategies employed to ensure it looks good but doesn't drop the guillotine on framerate?

[Maximum-Dev]

Hey Ryan,

Sure thing.
The scene there contains 44,500 grass instances. Running with a GTX 970 at 1080p it gives ~87 FPS. Haven't cleaned up the shader for optimization purposes yet.

[hippowombat]

Hey Ryan,

Sure thing.
The scene there contains 44,500 grass instances. Running with a GTX 970 at 1080p it gives ~87 FPS. Haven't cleaned up the shader for optimization purposes yet.

What's the material instruction count in that scene if you don't mind me asking? All things considered grass of that density and distance at that framerate on that hardware isn't too bad.

[Maximum-Dev]

What's the material instruction count in that scene if you don't mind me asking? All things considered grass of that density and distance at that framerate on that hardware isn't too bad.

Right now it's 110 instructions. There is room for optimization.

[phantom530]

Hey Ryan,

Sure thing.
The scene there contains 44,500 grass instances. Running with a GTX 970 at 1080p it gives ~87 FPS. Haven't cleaned up the shader for optimization purposes yet.

I am very interested. How large is that demo terrain?

[OptimisticMonkey]

I would be interested

[hippowombat]

One more question, are you looking into anything as far as shader-simulated collisions/wind patterns, stuff like that?

Cheers!

[jojo8026]

Does it work well for like backyard grass, how customizable is it?

[Crushed]

is this realistic or cartoony grass? looks stylized

[Maximum-Dev]

[MENTION=26882]phantom530[/MENTION], There is no landscape. Just a floor mesh scaled up so much.
[MENTION=25181]hippowombat[/MENTION], Wind yes, not collision (at least for now).
[MENTION=287455]jojo8026[/MENTION], I need to point out that this does not affect the mesh. You'd have to create the backyard grass mesh yourself but yes you can apply the master material to any kind of grass.
[MENTION=14197]Crushed[/MENTION], Well that's up to you to decide. I do think the current grass blades look a bit stylized.

[phantom530]

[MENTION=26882]phantom530[/MENTION], There is no landscape. Just a floor mesh scaled up so much.
[MENTION=25181]hippowombat[/MENTION], Wind yes, not collision (at least for now).
[MENTION=287455]jojo8026[/MENTION], I need to point out that this does not affect the mesh. You'd have to create the backyard grass mesh yourself but yes you can apply the master material to any kind of grass.
[MENTION=14197]Crushed[/MENTION], Well that's up to you to decide. I do think the current grass blades look a bit stylized.

I know that, I meant how big is the floor mesh? It looks big, but I want to know how big an area you are using to test.

[Maximum-Dev]

I know that, I meant how big is the floor mesh? It looks big, but I want to know how big an area you are using to test.

120x120 Meters. I had to set the painting density to 400 in order to have so much instances in this area. Normally you wouldn't have 45,000 instances in within 120x120 meters.

[Sitrec]

is this realistic or cartoony grass? looks stylized

A problem with creating realistic grass is that more realistic, thinner blades looks bad on many screens. There isn't enough pixels to render them properly so you often get tons of aliasing that can't really be fixed easily. That's why most games, even the otherwise realistic looking ones have cartoonishly thick grass blades.

[Maximum-Dev]

Distributed using grass node on landscape I reduced the scale along XY making the blades thinner.