Diffuse transmitter material

[Kram1032]

hum...
I guess, that's, 'cause of the behaviour of the diffuse transmitter:

it isn't a physically corret thing, but adds light it's own colour.

in that case, the coulour is aded many many times -> no more light :S

<- see? I already said that

[OnoSendai]

It's not 'adding' light. It's multiplying/attenuating it.

[Kram1032]

yes, ok...
But basically, I said that

[OnoSendai]

[Behrendt]

I got a problem with diffuse transmitter material. The lampshades all are blend materials between diffuse transmitter and diffuse. The tv-screen is a diffuse-transmitter material only. So without assigned material to the tv screen all works very well, but if I assign the diffuse transmitter material to the screen it seems to turn out the other meshlights. But have a look on your own.

[Kram1032]

hum...
maybe, you should make the screen pic not haing pure whites
decrease the contrast by 2 should be enough, I guess, to give the pic at least SOME colour^^
the emitter behind the screen either shall be either 6500K (sRGB) or as it is a new one, I guess, 9300K (high efficacy computer screens)

it appears to be a brihtness problem... try one of two things:
1) make the light behind the diftrans "indirect" by just making the left and right wall and "up" and "down" emitters and the backwall a pure white diffuse,
2) lower either efficacy or gain (or Wattage), dependin on which mode you're using for it.

Maybe also 3)
making the space between diftrans and lightsource an SSS mat

and 4) comnine those things, 'til you're satisfied.

[Behrendt]

1)I don't understand solution one, would be nice if you could post this in our both native language
2) I tested around with the different light-types and it only seems to happen with a blackbody light but with the other light types I can't get any results.
3) Why should this affect the behaviour of the other mesh-lights?
4) I wish I could be

[Kram1032]

ok...

please excuse that german part:
__________________________________
Mach einen kleinen Raum in den Fernseher.
Statt nur EIN Mesh-Licht in Form eines Recteckes zu nutzen, gibst du an die vier, durch die Vertiefung entstandenen Seitenwände, vier kleinere Mesh-Lichter.
Die hintere Wand sollte ein reinweißes Diffus-Material haben.
___________________________________
thx.

The SSS idea is: the light is less straight, when it hits the diffuse transmitter and it also is less bright.

I actually meant that as "expansion" of 1)

a new idea, which I have NO idea, what result it will give, is, blending the SSS with the diffuse transmitter.
That would be, like there was a "blur layer", before the actual pic appears.
And I guess, that should be rather realistic...

An other idea: two blends:
SSS in backpart to specular in front part (that may give a strange result, settings should be simmilar, besides the fact, that one is SSS and one iis pure transparent) and over that blend, add the difuse transmitter, by blending the blend with the diffuse transmitter

[Behrendt]

I tried to play around with wattages but then then the screen turns to complete black -> other mesh-lights work well.
edit:
I think I got a good solution. I turned the Intensity of the Light inside the tv to 0.01 and increased the exponent of the diffus-transmitter material to 4. This works pretty well.
But I still have no clue how this settings influence the other mesh-lights?!

[Wedge]

I tested awhile ago and found that when one light is too strong or too powerful it sucks up all of the other lights power.

So you are not alone, this can happen sometimes.

[Zom-B]

I tested awhile ago and found that when one light is too strong or too powerful it sucks up all of the other lights power.

So you are not alone, this can happen sometimes.

This is an classic Reinhard tonemapping issue!

[Kram1032]

exactly.
If you don't get the correct setting of lights, you more or less are SUPPOSED to use linear tonemapping.

But I think, it's still simpler, to get it right with reinhard...

[filippo]

wonderfull result...
this material it's very nice...
filippo

[SzLaszlo]

Hi ,

I try -Diffuse transmitter material-

This mat. work ( only color ) :

<material>
<name>LogoTDiff</name>
<diffuse_transmitter>
<albedo>
<constant><rgb>
<rgb>0 0 1</rgb>
<gamma>2.2</gamma>
</rgb></constant>
</albedo>
</diffuse_transmitter>
</material>

, but I use .jpg textura dont work :

<material>
<name>LogoTDiff</name>
<diffuse_transmitter>
<texture>
<path>*.jpg</path>
<uv_set>UVTex</uv_set>
<exponent>2.200000</exponent>
<a>0</a>
<b>1</b>
<c>0</c>
</texture>
<albedo>
<texture>
<texture_index>0</texture_index>
</texture>
</albedo>
</diffuse_transmitter>
</material>

I can't understand why

László

[CTZn]

try saving the jpg with another application, or even to a different format (png, tga).

Can you please report the Indigo error, it's important to answer you.