Help with refraction please

[wardy_mk]

hello. on this issue, I have some bell jars. when I place the bell jar over the item the refraction is CRAZY. It looks like the whole thing is full of water or something. I've attached a screenshot and a rudimentary file. Can someone help? You'll have to drop an HRDI into the scene to light it perhaps.... (mine's too big).

[James Vella]

Does the glass have thickness? If its just a 1 sided piece of geometry you need to use thin-shell in the material. Or just 'shell' the geometry, whatever the equivalent is in c4d.

[burnin]

Or just check "Thin" on your glass shader.

[wardy_mk]

It does have about 2mm thickness indeed.
I'll have a look at the shader and see what adjustments need to be made. Thought 'glass' would generally work on anything made from glass!

[TomG]

Your Boole needs "create single object" checked, else it will still be seen as two separate objects (making them appear as solid glass, not as one object with a thickness to the glass).

[wardy_mk]

Hello. Well, I did think this but I've tried it with a lathe - the the same effect...!

[davetwo]

Theres nothing wrong with the material - just your modelling technique :)
If dont want to model it with proper thickness. Then use c4d's inbuilt Thicken Generator, which is made specifically for this purpose

[wardy_mk]

Surely there's nothing wrong with a lathe?

[TomG]

Depends on how it is set up, as to whether it gives the proper "surface, surface, air, surface, surface" in the end result, all as a single object. Would need to see the lathe to know, but if it gave this result sounds like it too was either not creating a single object, or it was not creating an outer, inner, gap, inner, outer surface set up.

[wardy_mk]

Thanks, just clicked that box on the boolean worked!
This wasn't my model by the way, I was adapting it to use Corona materials then had to carry out some amends.
I'll try and remember that in future! Thanks. :)

[TomG]

Most welcome, and happy rendering!