Subdivision + displacement test

Post by **OnoSendai** » Sun May 11, 2008 10:30 pm

Messing around with some subdivision surface code, also with displacement mapping the subdivided mesh.

The preview surface in this scene is subdivided three times to create 2.8M triangles. The subdivision is done at scene load time currently, so it does take rather a lot of RAM.

I'll look into dynamic subdivision later, but this serves as a good benchmark for performance.

The map 'spherebump.jpg' is used as a displacement map here.

The 'ripples' on the surface are due to incorrect UV generation I think, as opposed to triangle resolution limitations.

Also there's the rather glaring issue of discontinuities at creased edges in the surface

Post by **fused** » Sun May 11, 2008 10:45 pm

omg!

i saw it coming

that will be a great release!

Post by **OnoSendai** » Sun May 11, 2008 10:46 pm

Some more pics.
Both these have 2 levels of subdivision, obviously displacement is used in one of the materials

PureSpider · Post by **PureSpider** » Sun May 11, 2008 10:50 pm

w00t! giev us t3h MPD now!

Kosmokrator · Post by **Kosmokrator** » Sun May 11, 2008 10:56 pm

looks promising Ono......
lets see how far can reach this stuff!!

thnx for ur work

BbB · Post by **BbB** » Sun May 11, 2008 10:57 pm

Now we're talking. We're on the way to Nirvana!
Once you're done with this, Ono, I seriously can't think of any more feature to request!

(PS: I don't know if that helps, but both Maxwell and Fry have this problem of displaced meshes tearing apart at sharp edges. Their solution is to set the smoothing angle of the mesh at 90 degrees instead of 60...)

EDIT: Does this mesh have split vertices by any chance?

CoolColJ · Post by **CoolColJ** » Sun May 11, 2008 10:58 pm

Post by **OnoSendai** » Sun May 11, 2008 10:59 pm

I thought the Fry guys solved the tearing problem?

There is a possible solution which is to insert some tris to form a 'wall' along the tear.

BbB · Post by **BbB** » Sun May 11, 2008 11:02 pm

I thought the Fry guys solved the tearing problem?

Could well be... They got a new version on the way anyway.

Man, I can't wait for this. That and the shift lens = full architectural suite!

EDIT: I actually don't mind some tearing pbms in the initial release. We can still do walls, carpets, grass, etc... Wicker might be trickier...

Gengibre · Post by **Gengibre** » Mon May 12, 2008 12:34 am

How much ram?? How much ram Ono??

Kram1032 · Post by **Kram1032** » Mon May 12, 2008 12:58 am

YAY

On the third image, what happened to the pink part of the texture on the lower right? The green mat on the lower left also looks slightly different in tone...
Did you use reinhard for those?

YAY

*please help! my disk's stuck*
YAY

...

CTZn · Post by **CTZn** » Mon May 12, 2008 2:10 am

!!! HURRAY !!!

Me happy !!! Let's see how much ram that takes !!!

Side note:

What disp does is pushing the surface in the direction of the surface normal, so no wonder if you have a sharp edge to tear the mesh ! Set you normals correctly and everything should be fine. I never heard about "fixing" this "issue", but setting proper normals, final dot.

suvakas · Post by **suvakas** » Mon May 12, 2008 2:39 am

F***ing ace !!!!!
Shifted lens and displacement were my only wishes. Now if you could also manage to fix the fireflies issue somehow, then I see no point in using any other unbiased renderer than Indigo !
Great stuff Ono!

CTZn · Post by **CTZn** » Mon May 12, 2008 2:51 am

BTW is there an output normal threshold, or is the disp mesh all the way smooth ? A threshold is cool, notably for natural surfaces.

Also a texture or angle threshold: if contrast/angle between two vertices of the original mesh is under that limit, do not subdivide.

Actually there is a lot of different ways to control displacement, wait'n'see !

Azazeo · Post by **Azazeo** » Mon May 12, 2008 2:52 am

Нихера себе!!!
Wow!!! Amazing!..
Will new beta come soon?

Subdivision + displacement test

Subdivision + displacement test

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