Emission Profiles.

Pickle Renderer

So I modelled my bedroom.  Well actually I modelled what I want it to look like after refurb, using Sketchup, then rendered it with Daz.  I have some hex LED lights (emissives) but they don't look right.  I think they need an emission profile (they do light up the area when the ball lights are turned off, so they are emitting).  I tried playing with bloom but it just blow them out.

I also checked Jürgen Furrer's IES database and it doesn't seem to have caught up with new RGB/LED stuff.  It's mostly spotlamps and so on.  Any ideas?  Maybe as there's no backlight and they're flat against the wall the light really is just diffusing around the room.  I expected it to light the painting a little and maybe the front wall.

Now I'm staring at it I think perhaps I should just get rid of them!  But they're fun to have as you can change the colour according to mood.

 

 

Catherine3678ab

Well Iray tries to mimic real light, in RL lights are stationed at the top of paintings, sticking away from them enough to shine the light on that one painting.

Or a full room light.

Or, a bit of a cheat perhaps but I too get tired of trying to get somethings lit properly - could try turning on the emission of the painting just a little bit. {let it light itself}

crosswind

Iray's emissive light is a bit fake, just a lit surface, with sharp edge of geometry... I say it just emits a light... IES, Blooming.. sometimes make it even worse.

In your room, there's no direct light on the painting, it looks pretty natrual. Or you may have a ceiling light... but still, such a oil painting seems with matte surface, and no frame or glass on it, it won't reflect much light...unless you tweak glossy and top coat values, maybe..

Totte

[Shameless plug]
You should take a look at my Emission Profile Master.
[/Shameless plug]
One of the things I learned with Iray and ies profile doingt his is that the Normals and Rotation of the acrtual meshes emitting the light is the key.
Thats why it comes whith two emitters, tat you can place and rotate and the emissive light is still correct.
Iray do only support the ies-type called "Street Lights", which per default light downwards (that's is what I suspect is the root to the polygon normal emission problem)

 

crosswind

Totte said:

[Shameless plug]
You should take a look at my Emission Profile Master.
[/Shameless plug]
One of the things I learned with Iray and ies profile doingt his is that the Normals and Rotation of the acrtual meshes emitting the light is the key.
Thats why it comes whith two emitters, tat you can place and rotate and the emissive light is still correct.
Iray do only support the ies-type called "Street Lights", which per default light downwards (that's is what I suspect is the root to the polygon normal emission problem)

 

Nice advice Mr.! I even missed this product. I'll learn and try it~ Thank you!

Pickle Renderer

Totte said:

[Shameless plug]
You should take a look at my Emission Profile Master.
[/Shameless plug]
One of the things I learned with Iray and ies profile doingt his is that the Normals and Rotation of the acrtual meshes emitting the light is the key.
Thats why it comes whith two emitters, tat you can place and rotate and the emissive light is still correct.
Iray do only support the ies-type called "Street Lights", which per default light downwards (that's is what I suspect is the root to the polygon normal emission problem)

 

Oh yes, I forgot about that.  I've had issues with IES profiles and normals/orientation before.