OTOY Forums

Hi Everyone,

I'm a bit new to octane, yes a noobie. I tried to render a simple cube that's supposed to look like a perspex cube thats sandblasted with a light inside. As you can see it came out all wrong...
Used a specular material for the cube because a diffuse one doesn't come anywhere close, unless i'm not doing something i'm supposed to do.

Even if I can get the cube all red without the foil voilet like surface.

Thanks

Some reference images of the look you want could be handy.
I'm guessing increasing the roughness parameter might be one of the things you are after...

Thanks
Chris.

Hi Chris,

The attached is the actual affect im after.
Iv'e tried adjusting the roughness but it still gives me he same effect.
I don't want to just copy one from the Live DB, i want to be able to make the materials

Thanks

For this you will want to model the cubes accurately.
ie: cubes with thick walls and hollow inside.
Then place a cube with some emission inside the box.

Make sure to use PMC or PT with a healthy amount of caustic blur and low max depth.

Make the cube a mix material. One with glossy and the other with specular.
Use the glossy one just to add some reflection if you want that.
For the specular one, make it full rough, with a transmission color that you want.
To give a good fade effect on the edges, add some absorption to the specular material (this will make the edges darker).

It will be very difficult to balance everything to get something accurate and that you like.
You will need to balance, light power, transmission color, absorption amount/scale to your liking (not to mention exposure etc).

Attached is a test i did to give it a go.

Thanks
Chris.

Hi Chris,

Thanks alot for your help.
I've still got a bit of a problem though. As you can see in the attachment the geometry is all scattered/jaggered.
Can this be a modeling issue? I've had this problem a few times before, but then I just "explode" all the geometry in my model because I use grouping & components alot (sometimes up to 6 layers deep), it usually solves it.
Am trying it now as well. I use sketchup, do you know if it may be a known issue?

Thanks Again.
Llywellyn

Yay,

Got it right.

The problem was with the exporting, the "export double sided faces" has to be turned off.
Thanks for your help. Will upload a pic once the whole project is done.

Llywellyn