How are we supposed to create accurate Vray glass objects?

[creasia]

Hey everyone,

 

I find that when I have two parallel faces of a vray glass (refract at Maximum) that I often have unpredictable results. Often the second face will multiply the refraction levels exponentially. I also find this with a cube shaped glass pane with 6 connected faces instead of two.

 

I find that if I delete the back face that it will help, or set the IOR to 1.1 it helps.

 

How are we supposed to create accurate Vray glass objects?

[Scott Schroeder]

Can you post some images to better clarify this?

 

More often then not, the wild results you are seeing may be more accurate than what you'd most often expect. But without an image, it's tough to really say if you are getting that accurate result or a result that is wrong.

 

A lot of times it helps to add a shell modifier to any glass object to give it real thickness. Vray can have a tough time trying to refract through only one plane with theoreticaly "zero" thickness. Think about a wine glass the glass that is "lathed" around has a thickness, so in max or whatever software you have if you just lathe a spline you are not giving Vray enough information to work off of. I usually use minimal thicknesses, around .02 to .03 inches thick and that seems to do the trick.

 

Even a glass box, each face in the real work would have some thickness to it.

[firebreed]

Hi creasia.

 

U mean, something like this?

 

http://www.aversis.be/extra_tutorials/vray_glass_liquid.htm

[creasia]

Thanks for that tutorial. I will try tweeking my settings in a similar way.