Bottle thickness / filling with liquid?

[-andrew-]

Hi everyone,

 

For the purposes of rendering, are there any rules of thumb for material wall thickness for a bottle (actually a plastic bottle, more on that in a minute) and "filling" it with liquid?

 

It's fine (and preferable) if the wall thickness can be equal to actual value.

 

I'm also uncertain of how to treat the bottle material and the liquid that fills it both in terms of coincidence with other objects as well as how to handle normals (assuming I'm using the right terminology...)

 

Regarding glass vs. plastic materials -again, I'd prefer to keep the original container proportions, if possible.

 

Thanks!

Andrew

[¢hris £und]

The way we used to do it in the olden days was to have the glass not solid,  the break would be where the meniscus of the fluid first contacts the glass.

 

the Fluid would be a solid.   That  way the rays   hit the glass, then immediately hit the fluid.    other wise the rendering engine wants to refract the light ray twice  for that boundary (fluid/Glass boundary)

[¢hris £und]

 

[-andrew-]

Thanks Neurascenic - 

 

Not sure what the break would look like - also, does the edge of the liquid intersect the glass?

 

cheers

Andrew

[¢hris £und]

Just at the edge of the meniscus.

 

Steps to produce:

    Create glass/Bottle in full

    Create Top of liquid with meniscus so that it extends just past the inside of the glass ( they intersect/cross )

    Use the S-Split tool with the "Two Way" selected.

    Delete the little bit of excess from the meniscus

    Stitch the top of the liquid to the split portion of the glass (bottom inside)

    Color the new liquid shape (which should be a solid) as you wish.

    Color the glass as you wish

Glass.fmz.zip

[pylon]

Hi Andrew,

 

You can use Maxwell's new nested dialectics feature, which makes rendering liquids within glass (or transparent plastic) easier to set up, and render more realistically.

 

http://support.nextlimit.com/display/mxdocsv3/Nested+dielectrics

 

Basically, you model the liquid so it slightly overlaps the interior of the glass, assign the glass material a Nested Priority of 0, and the liquid material a Nested Priority of 1. Maxwell takes care of the rest at render time.

 

The Nested Priority parameter is available within the Maxwell material editor (MXED), as well as in auto-translated material within formZ:

 

 

[-andrew-]

Thank you guys SO MUCH!

Great info. I own Maxwell so will definitely be doing some homework...

 

cheers

Andrew