Backlit Graphic

[natemac00]

Hey guys, I'm about two weeks into Octane and love it so far.
One quick technique I was hoping to figure out was how to create an accurate backlit graphic look?
Normally I would just create a illuminated material in Cinema, but I think Octane can get a more accurate look.
I took a look at the rice paper lamp that someone posted, but I had issue transmitting accurate colors.
I wasn't sure if I should be using the transmission from diffuse material or the medium from the specular material.

Any point in the right direction would be much appreciated!

[aoktar]

try texture emisson with images on texture channel.

[natemac00]

try texture emisson with images on texture channel.

Wouldn't that just be an illuminated material at that point and back lighting would have no effect on the material?

[natemac00]

It seemed to work as long as I had nothing in the Diffuse channel. Not the route I wanted to take, but it will work.

[aoktar]

this is faster way that causing extra calculation due backlight. Add or multiply by a gradient,etc... to obtain better look.

[natemac00]

this is faster way that causing extra calculation due backlight. Add or multiply by a gradient,etc... to obtain better look.

But I lose some of the detail in the image (when using something like a photo not this) when I texture the emission channel. Everything gets blown out pretty easy as I move up.

[aoktar]

Try different combinations until get what you want. You'll find it.

[caldreemn]

Here's a freebie.

Use the emission channel, not the transmission channel.

File attached.

[natemac00]

Here's a freebie.

Use the emission channel, not the transmission channel.

File attached.

This was great caldreemn, exactly what I was trying to go for. I noticed what really did the trick was adding the noise channel to the Distribution. I'm still a bit of a newbie, what exactly did that do to correct some of the hot spot issues? Is it just not making the the light produce 100% in all locations?

[caldreemn]

Yes, adding some noise to the distribution node helps spread the light in a more natural way (in my experience). I also tend to click the UVW transform and scale the noise up to a large amount (50 -100), as the native settings tend to result in noise that is too small imo (though this is just my preference). I didn't scale the noise on the texture emission, but I did do it with the spherical lights (blackbody emission).