Light problem

[Anonymous]

Hello mates!
I 've been seaching this great forum - but didn't find any already existing tread about it:

While rendering I have a problem with light source.
Lets take halogen lamp and put it in an interior. I will have the light that it give and bright room - but I won't see any light source (highier intensity light near the bulk).
The same goes with any other light source in ArchiCad 9.

Could you please explain me how to show the highier intensity light near the light source?

Best wishes and please forgive me my language.

[Anonymous]

I think we misundertood each other Dwaight.
I finally managed to get the effect I wanted using reverse light:

On the picture you can see what I meant from the begining...
Thank you for help and BTW - is your book still avaible?
Greetings!
Dpistons

P.S.
Is there any kind of chance to make the same effect another way that I did it?

[Dwight]

My book is available.
Ordering instructions are in my post signature under this message.
I have already sent several to Poland.

The other way to make a surface look as if it is glowing is by using the "constant reflection shader."

[Rob]

just for the reference in the past this topic should not have had to be so dramatic if GS would have implemented some of the features mentioned in this topic:
http://archicad-talk.graphisoft.com/viewtopic.php?t=8012&start=0&postdays=0&postorder=asc&highlight=...

which could save some of the pages with a tedious explanation of dodging the light settings in Dwight's book for better, brighter and lighter words when it comes to setting up our fabulously designed lighting schemes.
oh, how I miss lux, flux, watts, candelas spread over feet and meters...

[Anonymous]

Dwight wrote:
The other way to make a surface look as if it is glowing is by using the "constant reflection shader."

Dwight,
maybe my question will be dumb but can you tell me what is constant reflection shader and how to use it exectly?

[Anonymous]

Just from aside:

Generally:
It is important to understand that light has to work together with materials to get desirable effect. You can spend hours tweaking lamps/lights and still end up frustrated with uneven lit scene. Effects such as light fixture glow should be set in the end, when you first manage to fill the scene with light and get rid of deep black shadows (behind the wc) and burn outs (on the floor).

Particulary:
I would start with pairs of lightcone down + lightcone up with 130 deg cone angle each and falloff around 1 to fill the room with even ilumination. Than you will see that some of your materials are burn out (like floor for example) and you might want to decrease "diffuse" and "ambient" in matte materials or balance "roughness" and "specular" in reflective materials.
Finally, after looking for some light-fixture-glow-solution I found (thanx to Dwight) that "Wall light indirect" with "diffuse light" on is something you should try, but as I said before: only after you fill the scene with light and balace your materials. For light emmiting part of light fixture use "constant" or "dielectric" shader with high "transmitance".
Below examples show the result.
You might also want to check this topic as there is something about the light fixture as well.

http://archicad-talk.graphisoft.com/viewtopic.php?t=10074&postdays=0&postorder=desc&&start=30

Hope this helps,
Cheers

[Anonymous]

and another..

[Anonymous]

Thank you Tigr for another feedback and really great scans.
I see you have a solution for my worries!
Best wishes