Self Illuminated jpeg - Increase G.I. intensity

[MilkmanDave]

Hello, Please view my attachment.  In C4d Physical Renderer with GI... I know how to make a jpeg light up a dark room.  HOW do you do this with Corona?  I can't seem to get this result.  I have tried a Corona Light material with a jpeg texture, and even cranked up the Intensity but no luck.  Thanks for any help!  I'm new to Corona and I freaking love it so far.

I can get a similar effect in Corona but if I increase intensity the JPEG gets blown out... (too hot).  Thanks eveyone.

[maru]

In this case you should use the CoronaLight material. There is a 3ds Max guide on self illumination vs light material here: https://coronarenderer.freshdesk.com/support/solutions/articles/5000515603
Same rules apply in C4D.

When using self illumination, the generated light is additionally cut off by the max sample intensity, that's why it will usually appear darker than Corona Light mtl with similar settings.

[TomG]

If you want separate control over the lighting intensity and the visible look, you can use a rayswitch material, see https://help.c4d.corona-renderer.com/support/solutions/articles/12000005460-what-is-rayswitch-material-and-map-

Create your Light Material as before only this time uncheck Emit light (it will still work in this case! If you leave it enabled it will bleed through into the visible when using it in this way). Add it to the GI slot of the RaySwitch. Duplicate that LightMaterial, and add it to the other three slots. Now you can control the lighting cast into the scene with the intensity of the first LightMtl, and the brightness of the visible / reflected / refracted version with the intensity of the second.

Here's a grab of the RaySwitch setup, and an example where I exaggerated the difference:

[MilkmanDave]

Thank you Maru and Tom, I will try your suggestions today! ☺