Indigo v1.0.2

Marcofly · Post by **Marcofly** » Sat Nov 10, 2007 1:02 am

but how do you make the light-lens visible (as in Wyt pic..)?
maybe your english is too complicated for me..

Kram1032 · Post by **Kram1032** » Sat Nov 10, 2007 1:05 am

That's the new feature, of Indigo, using IES support

Marcofly · Post by **Marcofly** » Sat Nov 10, 2007 1:15 am

Kram, i explained my request in the wrong way.. i can create a meshlight, apply the ies profile on it, and see a very nice light cone on the wall.. But i can't see the emitter itself (like in WytRaven pic). i tried all types of light (blackbody, rgs, peak, uniform..) but i still can't see the light source! i tried to put a disc over it, with a lower gain than the ies, but still can't see it.. is there another way?

WytRaven · Post by **WytRaven** » Sat Nov 10, 2007 1:19 am

Marcofly:
In my image the meshlights themselves are all single surface discs with face normals pointing down. They are blackbody emitters with a temperature of 4500K.

Marcofly · Post by **Marcofly** » Sat Nov 10, 2007 1:44 am

still can't find a solution: in the second image i used a normal blackbody emitter, with a low gain, and under that a small blackbody with ies profile attached (very high gain). the bigger blackbody is visible, but you can't see the ies light cone! in the first image i used only a blackbody with ies profile.. you see the cone but not the light emitter! What should i do?

thank you, maybe the solution is easy, but i can't find it..

WytRaven · Post by **WytRaven** » Sat Nov 10, 2007 1:49 am

Um...unless i'm missing something I can see the emitter in the second image just fine...

Here's the XML for one of the lights in my scene in case it may help you:

Code: Select all

	<!-- PanarcLight1 -->
	<model>
		<pos>0.874999 -0.875000 2.744302</pos>
		<scale>0.01</scale>
		<rotation>
			<matrix>
				1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 
			</matrix>
		</rotation>
		<mesh_name>PanarcFitting</mesh_name>
	</model>

	<!-- PanarcML1 -->
	<meshlight>
		<pos>0.874999 -0.875000 2.708035</pos>
		<scale>0.01</scale>
		<rotation>
			<matrix>
				1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 
			</matrix>
		</rotation>
		<mesh_name>MeshLight</mesh_name>
		<spectrum>
			<blackbody>
				<temperature>4500</temperature>
				<gain>1</gain>
			</blackbody>
		</spectrum>
		<ies_profile>
			<path>..\textures\IES\erco\Panarc-FloodLens-CompactFluorescent-2x9W.ies</path>
		</ies_profile>
	</meshlight>

Marcofly · Post by **Marcofly** » Sat Nov 10, 2007 1:58 am

thank you, Wyt! in the second you can see the emitter, but it's not a ies emitter, just a meshlight..

Kram1032 · Post by **Kram1032** » Sat Nov 10, 2007 2:23 am

you also can see the emitter in the first
IES are supposed to be point lights.
So, your mesh needs to be as small as possible

You wont see a light bulb, though

CTZn · Post by **CTZn** » Sat Nov 10, 2007 4:44 am

see what I mean?

Absolutely, no lens should be in front of a IES emitter.

Biased raytracers can exclude some objects from being lit by some lights to allow such tricks (ie the lights holds a list of meshes to light, that list can be inclusive or exclusive)... For instance you would use a special light only to light the interior of the lamp like a bulb would, it couldn't light something else, and the IES to actually illuminate the scene.

Still I think the IES effect is sufficient for nice images, without such tricks. And it removes the cost of refractive caustics from luminaires lenses, potentially speeding artificially lit renders a lot.

WytRaven · Post by **WytRaven** » Sat Nov 10, 2007 5:09 am

Absolutely, no lens should be in front of a IES emitter.

...that was exactly my point CTZn...

joegiampaoli · Post by **joegiampaoli** » Sat Nov 10, 2007 8:44 am

Ok, yes, I can confirm a strange bug with IES
With ies data the lamp becomes black and without it you can see it shine, but I am trying to recreate the exact scene I posted on page 3 of this same thread and I cant achieve the lamp brightness.

Here's the link to image so you can see I did achieve it before, but now I can't for some strange reason.

http://www.indigorenderer.com/joomla/fo ... ut_569.jpg

I think that maybe has to do with blendigo exporter? I am not sure if I had updated my exporter when I did that render.

Here are some comparisons.

joegiampaoli · Post by **joegiampaoli** » Sat Nov 10, 2007 10:12 am

Ok, I found the problem, it's nothing to do how you export the light mesh, it's actaully a bug within how indigo works with certain IES files. Here's exactly the same scene but with another IES file, and it works well.

The IES file is number 19 from the ones SmartDen provided us inside blendigo.

On the last post where it doesn't show the brightness is number 18 from the same set.

Damn! I am loving this IES implementation

Thx Ono!!!!

EDIT: Updated with cleaner render.....

Marcofly · Post by **Marcofly** » Sat Nov 10, 2007 11:30 am

i tried a different approach, with a ies light that didn't want to show.. here a hemisphere, normal pointing inwards, with a white diffuse transmitter material. inside, a very small ies light..

I agree, ies lights are a very good implementation!! thanks Ono!!

joegiampaoli · Post by **joegiampaoli** » Sat Nov 10, 2007 1:41 pm

Ok Marcofly

So for now the ies has to be kinda far from the mesh? If you did that same scene with a flat mesh you would get same error?

EDIT: Ok I misread your post, it doesn't show with a flat mesh that's why you did this approach lol

Post by **OnoSendai** » Sat Nov 10, 2007 4:13 pm

Hi,
The 'black IES emitter mesh bug' is not a bug, it's a consequence of how IES lights work. IES data describes the directional distribution of light emitted from the light source. If the IES file says that no light is emitted in the direction from the light to the camera, then Indigo will not emit light in that direction, and it will of course appear black

Indigo v1.0.2

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