[wagurto]

Hi Fernando would you mind share your technique to achieve the grass look at the edge of the pool?
thanks in advance

[Fernando Tella]

Hi Fernando would you mind share your technique to achieve the grass look at the edge of the pool?
thanks in advance

That's made in Photoshop cloning with a grass blade shaped brush. Pretty fast and effective.

[tok]

with the current state of Maxwell Render - it is not possible to render water physically correct (caustics, transparency, shadows) within normal rendering times and SL. Or I guess more correct: you can render it physically correct, but it looks wrong. AFAIK you are forced to cheat to achieve something that looks natural.

Hm. I cannot believe that a material that is in need of so much cheating for a halfway correct look can work physically correct. (S. the strange attenuation difference between pure water and water in a box.) Though cheating is possible already - will there be a "water update" soon, NL?

[JTB]

It will be a dielectrics update, not just a water update. There are problems with dielectrics and light, that's why we got AGS.

[Fernando Tella]

I think that will come with RS2 and that will be with MW2.0, I guess.

Now you can have refraction or caustics behind a transparent object, but not both at the same time.

[tok]

It will be a dielectrics update, not just a water update. There are problems with dielectrics and light, that's why we got AGS.

I thought AGS was just for to save time. Anyway, I am lookin forward to trying the new dielectrics.

[Mihai]

tok, it depends a lot on your viewing angle because of the fresnel effect. If you look at the water more from above, like in the photo you posted, you will start seeing the bottom of the pool more, but if you look at it from a low angle, like in Fernandos render, the water turns more and more into a 'mirror'.

[JTB]

I think that will come with RS2 and that will be with MW2.0, I guess.

Exactly...

[numerobis]

yes... we've never been told that this mxw could render sunlight through glass... only that it renders physically correct...
...maybe some rc's should be able to do so but who cares...
so... why not buy a 2.0 with sunlight behind glass as ultra physically correct feature?

[tok]

tok, it depends a lot on your viewing angle because of the fresnel effect. If you look at the water more from above, like in the photo you posted, you will start seeing the bottom of the pool more, but if you look at it from a low angle, like in Fernandos render, the water turns more and more into a 'mirror'.

Mihai, the higher the point of view, the less fresnel effect - in this respect Max works well. Still, from above the water is as inky as from any other visual angle. (Compare the empty pool with the filled one, both of them under the same physical sky.)

[Mihai]

This is because of the caustics seen behind a dielectric issue, as discussed before. There are some different ways you can get both caustics and reflections. If you search on the forum and gallery, it's been discussed in length many times before.

[Bubbaloo]

But caustics will eventually show up behind a dialectric, right? So it actually works, it's just computationally expensive?

[Mihai]

That's right, it's especially difficult with a small distant lightsource = the sun.

[tok]

This is because of the caustics seen behind a dielectric issue, as discussed before. There are some different ways you can get both caustics and reflections. If you search on the forum and gallery, it's been discussed in length many times before.

On the forum I found two, maybe three methods to get both caustics and reflections, one of them practiced in one of my examples above. A similar approach (modeled water instead of the displacement map I used) is this one: http://www.maxwellrender.com/forum/view ... f32af3bc49, and another one is explained here: http://www.maxwellrender.com/forum/view ... d8e16579a8 (haven't tried it yet).

However, my question did not refer to faking techniques but to the lack of transparency the wizard water shows. Wizard water is inky, real water is transparent - even from a low viewing angle you can see shadows on the pool ground and the legs of the people (extremely refracted, of course).

[Fernando Tella]

Water is transparent. You can see clearly the objects through it; but as light isn't seen neither are shadows. So the overall is darker than it should, that's right.