[CodyKallas]

So I was reading this,

http://support.nextlimit.com/display/tu ... or+renders

This might help in my case, but is this applicable. I have a window wall. Basically made of a wall of windows that is about 8ft tall by 60ft long. Like a side of a large building. I am having trouble getting the noise from the environment gone. Could I make an emitter that big? That stretched where the entire glass is? I have the glass divided by like 3 inch dividers. So each window is techincally like 8 ft by 4 ft. Would I have to put an emitter in each one so I have like 20 emitters? Or could I do one big one?

Of course, Thanks for any input

Cody

[a.behrens]

Or could I do one big one?

A big one right outside of the window.

[CodyKallas]

I tried that but it blocked my sun rays coming in from my physical sun then:( even when I had it set to hide from camera.

[photomg1]

its because you didn't turn that plane into a ghost emitter

[Fernando Tella]

How to make them: http://support.nextlimit.com/display/tu ... e+Emitters

[eric nixon]

Even though I know all about this, the demonstration image is still very confusing, quite an achievement really...



could this image be more confusing? what is that square in the middle representing? why is it absent in the third image?

[CodyKallas]

I understand it. But different strokes for different folks. I have made ghost materials. But I thought I did that and it still wouldn't, but I shall try again. I missed the transmittance step, forgot to turn that to pure white. Got it working now. How do I know how high to turn the emitter for that then? If it is filling up such a large area? or does it really not matter and anything will help?

Thanks guys,

Cody

[photomg1]

what does confuse me in the way it works is having an emitter hidden to global illumination what exactly does that do? I know how it works on other objects just not emitters.

I would have expected it to look like it is on , but not light the scene (effect anything else ) but it does light the scene hence my furrowed brow

[CodyKallas]

It isn't hidden from global illumination though. It is actually suppose to be boosting the GI of the environment. (I think) lol Thats the way it looked in the doc I read. I was just going to ask this question though, do I then turn off the environment and just use the emitter to light? Or is it really "boosting" the environment I have on already?

I will try and render one with the environment and no emitter and with the environment and emitter on. So I can truly see what has less noise and stuff. I can't really turn off my environment because I have an image outside my window and it is lighting that as well. I would have to do that in post then.

[photomg1]

if you want a quicker rendering interior , just put an emitter plane where the windows would be don't make them ghost emitters .It will look like blown out daylight coming through the windows.
Disadvantage you can't use hdri's or the sun in maxwell using this.

The emitter in the tutorial and what you are trying to do is basically directing rays into the interior , rather than rays bouncing everywhere around your scene and then only some of them finding there way into the openings which takes longer to clear. The disadvantage of this way is that the scene might look more like you have lit it (without careful tweaking) as opposed to a more naturalistic look that you would get from sun sky /hdri . So really you are boosting the number of rays that find there way into the interior hence the suggestion of using the sky colour on the tutorial.(The tutorial way is more like putting an area light in modo which you would do to boost the GI in modo)


My question was slightly off topic and would still love to know the answer

[CodyKallas]

Yeah that disadvantage is what I am facing now, but I am going to see what the ghost emitter does just incase.

Thanks for the input.

[eric nixon]

My question was slightly off topic and would still love to know the answer

Its a good question, here is answer; if you put 'hide-to-gi' tag on the emitter it will light the scene but only directly (the light wont bounce) this is why a shadowless emitter requires the ghost bsdf method.

Its worth noting that an emitter which doesnt 'bounce' is also quite useful for certain fx or scene optimisations.

Also worth mentioning that the method in the 'tutorial' of using an emitter in the window frame, is most bogus.. so I thoroughly recommend not doing that!

I can't really turn off my environment because I have an image outside my window

Just make that outside stuff visible to camera only.

[CodyKallas]

I can't really turn off my environment because I have an image outside my window

Just make that outside stuff visible to camera only.

I don't think that really makes a difference because the environment is actually lighting that image outside the window. I will just leave it on and render to like sl 25 No noise then.

[photomg1]

many many thanks for that Eric , re hidden to gi emitter very good to know !

when you say its bogus with regards to emitters outside of the interior and just outside the windows what do you mean ? I only say that, as I said before it can look a bit fake if not done carefully.
It just seems one of the few solutions to speed up convergence (or at least the appearance of it) on an interior .

If I was to go down a pure hdri route for example I'd expect it to look good ish by sl20 and good noise wise at around sl 22 . Sl 22 breaks my patience , so more often I would look at something from sl18 onwards with some noise reduction in post. Or as I've often resorted to putting in fill lights , inside or outside an interior to bring times down to an acceptable level.

Hopefully I'm missing out on a killer way to improve interior times without doing that.

edit :Cody I'm going to send you a mxs in about 30 mins you might find helpful.(done)

[eric nixon]

when you say its bogus with regards to emitters outside of the interior

I didnt say that, read things more carefully pls. I would recommend a large emitter a few meters outside the window as mentioned earlier.

the environment is actually lighting that image outside the window

I think were talking at cross purposes, you should post images, because its hard to understand otherwise.