water material

[torsten]

I need to send a ray through water. Do you think the indigo material water(blue) is realistic enough? It seems to absorb quite a lot of light. Any ideas, or new materials?

Torsten

[Zom-B]

if you took a water material from the MatDB that has SSS enabled, you need to take care of your scene export scale. keep the exported size life like, or you end up with a ocean in a water glass

try this water here: http://www.indigorenderer.com/materials/materials/31
Thats the most realistic clear water we have!

[torsten]

Hi Zom-B,

I have a box full of water which is 240mm long. I'll try the material you showed me. I think that's what you ment by life like export scale. Important is of course the IOC. It schould be 1.33. I'm not sure about the other coefficients. What exactly does the SSS stand for?

Thanks

Torsten

[Zom-B]

SSS = Subsurface Scattering

Regarding export size... your internal 3D app scale isn't actually representing the "exporting" scale in each Exporter!
For example in Cindigo, even if you set your internal C4D measure unit to mm, Cindigo exports by default in meters, so you end up with a 240m big swimming pool, and this could explain high absorption of the water!

Tell us something about your 3D app you work with, so we can figure out if this maybe the issue!

[lycium]

If this is the Torsten I've been in contact with, he's using SketchUp.

[CTZn]

the mesured dimensions of an absorbing volume will affect the final look, as light is dimmed according to the distance it travelled through. So it's not only about the IOR when absorbtion is used, real scale models are mandatory.

This was just a precision since your tank is measured (in SketchUp ?).

[torsten]

ok, I get light through it now. Took me a while to find the mistake. One more questions to the topic precendence. What precedence do white, charcoal... have? I can't change it for these materials.

[Headroom]

Precedence only applies to specular (transparent and semitransparent) materials. It determines which material takes precedence over another, for example, the water and your glass container likely have overlapping (intersecting) geometry. Indigo needs a hint which of the two materials to render in that overlapping region. In reality the glass displaces the water so it will receive the higher precedence .

The Indigo Technical Reference (available in the Documentation section) explains how to model and set up materials for a wine filled glass. This should apply to your scene as well.