OTOY Forums

Hi guys,

I am struggling to create a bright green emitter (without filter layer). Played a lot with the settings but the colour temp range seems to jump from red to yellow, straight into the blue/white range, skipping my coveted green completely.

Any help / advice would be much appreciated!

Seeker

Your beloved green is getting killed by your black body emission The reason it goes from red to yellow to white to blue, is because that's the Kelvin scale of color temperature (do a google image search and you'll see it in more detail). There's no green in that scale. So, if you want green light emitted, you should use a texture emission instead of black body emission. Then you can plug your most favoritest green color into it.

riggles wrote:Your beloved green is getting killed by your black body emission The reason it goes from red to yellow to white to blue, is because that's the Kelvin scale of color temperature (do a google image search and you'll see it in more detail). There's no green in that scale. So, if you want green light emitted, you should use a texture emission instead of black body emission. Then you can plug your most favoritest green color into it.

Ooo, so obvious! Thanks Riggles. Interesting that the diffuse colour has no influence once a texture emission is selected. Wonder why it's not disabled then...

Thanks again Riggles.

Seeker

Glad I could help. It's always the obvious that gets me. The diffuse isn't disabled because it's still there. If you lower your emission power dramatically, you'll see it blend with the diffuse color. It's just that the diffuse gets overwhelmed by emission power quickly.

riggles wrote:Glad I could help. It's always the obvious that gets me. The diffuse isn't disabled because it's still there. If you lower your emission power dramatically, you'll see it blend with the diffuse color. It's just that the diffuse gets overwhelmed by emission power quickly.

I also thought that should be the case but try as I may, I could not get a mix... I'll take your word for it and play a bit more.

Best,
Seeker

The diffuse does have an effect, but not on emission .. if your emisison is very weak. It still means your mesh has the diffuse surface color ... but you can emit on top of that so hard, that you wont see any of the diffuse. Also, I hear you should not go perfect RGB, so for green rather 0.1 255 0.1 or so instead of 0 255 0. Strong intensities (often needed to get it to behave like apüroper light) alter colors of the emission, too ... it's a bit confusing.

Seeker,

Have you tried making your diffuse blue (like a gel) and keeping the emitter in Kelvin?

I've not tried this. Just an idea.

best,
O

Thanks for the tip, Voon. I'll play with that.

Hi Olitech,
I have not tried that. Lot's to learn about emitters. Soon there will be some 'interesting' images from me with a bit of special lighting...

Best,
Seeker