Trees

Post by **OnoSendai** » Sun May 04, 2008 11:41 pm

On a roll here...

Post by **OnoSendai** » Sun May 04, 2008 11:55 pm

One more...

BbB · Post by **BbB** » Mon May 05, 2008 12:56 am

Did you use the .obj directly tho?

Nope, imported in Blender first.

Looks good. Should the leaves be so dark though? Maybe to do with the texture... Am having the same problem on a scene right now - very dark trees...

EDIT: Did you smooth your meshes? I can see reflective facets. Your IOR/Exponent seems quite high too.

Post by **OnoSendai** » Mon May 05, 2008 1:17 am

the leaves have IOR 1.4, exponent 1000.
Normal smoothing is false.

Dunno about the leaf darkness.
I have the diffuse transmitter fraction quite high (0.3), which would mean the normal phong scattering is effectively multiplied by 0.7, which would contribute to the darkness.
So perhaps a blend like 0.1/0.9 might be better.

Regarding the reflective facets, I kinda like those

But I think it would be more realistic to either use a bump map or to reduce the exponent. Reducing the exponent will render faster, but won't look as good if the camera is close to a leaf.

Post by **OnoSendai** » Mon May 05, 2008 1:20 am

There's also tons of papers on the scattering properties of leaves if someone wants to do a literature trawl

Image: converged render, same scene as above.

BbB · Post by **BbB** » Mon May 05, 2008 1:23 am

Normal smoothing is false.

Why, oh, why?

(...)

I think I'd reduce the exponent a bit. I remember using a bump map with this tree and it worked quite well.
And what about using a weight map for the blend, to make the thicker parts of the leaf less transparent...?

EDIT: Last render -> that was fast! Do you have a monster machine or is this from the optimisation you made?

Macrob · Post by **Macrob** » Mon May 05, 2008 1:25 am

Oh, I´ve given up the tree thing already.
Here are three of the WIP´s I did not delete

BbB · Post by **BbB** » Mon May 05, 2008 1:29 am

These are cool too!

These models are really nice. But boys, are they heavy!

Macrob · Post by **Macrob** » Mon May 05, 2008 1:37 am

Heavy?
3 trees and my RAM explodes

Post by **OnoSendai** » Mon May 05, 2008 1:40 am

BbB: I have a Core 2 Quad @ 2.4 GHz

I think the changes I've made have sped up tree rendering a lot.

BbB · Post by **BbB** » Mon May 05, 2008 1:44 am

Oh my. I won't get a minute's sleep till you release this one...

Post by **OnoSendai** » Mon May 05, 2008 1:44 am

Just looking through some papers,
It seems the transmittance can be quite high, for example 50%, at least for Maize leaves

The main cell contents of leaves have an IOR of about 1.33, due to the high water content. I'm not sure about the waxy layer on the front face though.

BbB · Post by **BbB** » Mon May 05, 2008 2:32 am

Nerd!

Post by **OnoSendai** » Mon May 05, 2008 2:42 am

heh, you're not going to get accurate leaves just by dragging sliders you ... you .. artist!

Zom-B · Post by **Zom-B** » Mon May 05, 2008 3:37 am

OnoSendai wrote:I think the changes I've made have sped up tree rendering a lot.

Speed-Ups are always welcome... sweet!

OnoSendai wrote:...Reducing the exponent will render faster...

Nice to know!

OnoSendai wrote:heh, you're not going to get accurate leaves just by dragging sliders you ... you .. artist!

ROFL XD

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