Indigo v1.0.2

joegiampaoli · Post by **joegiampaoli** » Sat Nov 10, 2007 4:49 pm

Oh!

So if I don't (or we don't) want it to show as black on certain lamps, what would be the best approach or work around?
Also why is that? That the ies file would have certain value to not show the light emitted from the luminaire to the camera? I have googled it up but no answers

Big Fan · Post by **Big Fan** » Sat Nov 10, 2007 5:57 pm

Q. will these IES lamps work with sss in a dusty air as per sunlight?
as in can I show cones of light shining on a museum exhibit or such?

Post by **OnoSendai** » Sat Nov 10, 2007 5:58 pm

A. Yes.

WytRaven · Post by **WytRaven** » Sat Nov 10, 2007 11:25 pm

Joe it's a matter of the lens/enclosure that the IES is describing at certain angles it would be that no direct light is being cast between the light and the camera. So therefore the camera doesn't see it as a light source. the areas covered by these lightless angles would still get lit by indirect light but from the point of view of the camera there is no light there. This doesn't effect 'normal' mesh lights as the way I understand it they cast light uniformly from a hemisphere centrered on the face normal so if a camera can see it by line of sight it will always see it as a light as there will always be a direct ray path between the light and the camera.

Despite all the usual "ono you are so great" type posts in response to 1,0,2's IES implementation I for one think that the way it is implemented currently leaves a lot to be desired.

WytRaven · Post by **WytRaven** » Sat Nov 10, 2007 11:27 pm

Q. will these IES lamps work with sss in a dusty air as per sunlight?
as in can I show cones of light shining on a museum exhibit or such?

Um...try reading the rest of the posts first, I have already posted an example of exactly that...

Zom-B · Post by **Zom-B** » Sun Nov 11, 2007 3:27 am

Something strange is going on here O.o

IES Light number 18, one tiny polygone emitter. Blackbody 6500 the actual light bulp is a diffuse emitter and gets tonemapped to black...

The ground is an textured phong with exponent map & Bump.
The strange thing about the light Spots on the ground is, that they aren't parallel to the wall !?
any ideas?

Kram1032 · Post by **Kram1032** » Sun Nov 11, 2007 4:12 am

what do you mean with they aren't paralell?
They look just fine, except if those white spots on the floor aren't supposed to be there....

Zom-B · Post by **Zom-B** » Sun Nov 11, 2007 4:35 am

Kram1032 wrote:what do you mean with they aren't paralell?
They look just fine, except if those white spots on the floor aren't supposed to be there....

Sorry, I was refering to the light spots on the ground, that have a pattern that is some degrees off the wall...
The whole scene is set up in staying in 90° turns, so why are the artifacts at ~2.5° off the wall???

Kram1032 · Post by **Kram1032** » Sun Nov 11, 2007 4:44 am

oh, now, I see it

Zom-B · Post by **Zom-B** » Sun Nov 11, 2007 6:00 am

Hmmm... I tested around with this scene, and tried to use standart black Body on the light bulp.
The strange Spots on the ground stayed, so IES Code don't seem to be the evil behind this

I Also attached the mesh view for the Spot (original work by radiance some long time ago!).

I'll keep on testing...

**EDIT**
OK, it seems that problem is based on the Bump map I use for the floor

I do some further test, because the bump + exponent map shouldn't result in such strange results...

Big Fan · Post by **Big Fan** » Sun Nov 11, 2007 7:55 am

@Wytraven
thanks pal - I dont really read your stuff... however ono answered my question already so there was really no need for your comment was there?

WytRaven · Post by **WytRaven** » Sun Nov 11, 2007 8:06 am

Is there really any need for you at all?

Big Fan · Post by **Big Fan** » Sun Nov 11, 2007 8:10 am

oooh very rude guy

send me PM if you must have a go

WytRaven · Post by **WytRaven** » Sun Nov 11, 2007 8:13 am

Big Fan · Post by **Big Fan** » Sun Nov 11, 2007 8:17 am

well in that case keep your bad mouthing to your self

Indigo v1.0.2

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