How to simulate a sun lit interior with the SU exporter?

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kwistenbiebel
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How to simulate a sun lit interior with the SU exporter?

Post by kwistenbiebel » Tue Feb 06, 2007 2:11 am

Hi all,
I am very happy with the plugin but i have difficulties to simulate direct sunlight in the interior.
It seems that if you turn on the 'sun-sky' that indeed it renders with sky, but it doesn't show sun light. This results in blueish output as if it was a overcast day.
Should we make an extra emitter to simulate the sun?

Here is the output i get:

Image


This is a version with artificial light from spots:

Image

...and a version with meshlight assigned to the window surfaces (blackbody 3500 K):

Image


Could someone 'shine a light ' on how to make it a sunny interior?

Thanks,

kwistenbiebel

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Whaat
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Post by Whaat » Tue Feb 06, 2007 2:25 am

Turn off the visibility of your windows or make them transparent by using the opacity slider in Sketchup. Make sure shadows are turned on in SU so that you can see the direction of the sun. Adjust the shadow settings until you are happy with the sun direction. I suggest putting your windows on a hidden layer or make them fully transparent so the light can freely enter the room. SkIndigo will not export geometry on a hidden layer.

Whaat

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kwistenbiebel
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Post by kwistenbiebel » Tue Feb 06, 2007 2:40 am

Thanks Radiance and Whaat.
I did all those things you suggested. In sketchup i can see sun light on the floors.
The render output remains blue however.
When i render the outside of the building it looks blue as well...so there is something wrong with the sun setup?
Is it me or indigo/exporter ? :)

sun turbidity was set '2'.
in sketchup: time 13:40 , date March.

here is the outside. Excuse me for the poor outside of the model but i use this model just for interiors:

Image

regards,
kwistenbiebel
Last edited by kwistenbiebel on Tue Feb 06, 2007 2:42 am, edited 1 time in total.

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kepler
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Post by kepler » Tue Feb 06, 2007 2:41 am

Hello, can you tell me how to make those opaque windows? 8)
I've also opened a topic about that...

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kwistenbiebel
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Post by kwistenbiebel » Tue Feb 06, 2007 2:44 am

Kepler,
i assigned blackbody light to the window surfaces (mesh light) in the shot you are referring to.

I like to stay on topic here though...Rendering sun light is primordial to me.
using a mesh light in window surfaces is a 'fake' method to me ;)

regards,
Kwistenbiebel

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afecelis
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Post by afecelis » Tue Feb 06, 2007 2:46 am

@kwistenbiebel: how are you creating the mesh emitters in Sketchup?
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kepler
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Post by kepler » Tue Feb 06, 2007 2:50 am

kwistenbiebel wrote:Kepler,
i assigned blackbody light to the window surfaces (mesh light) in the shot you are referring to.

I like to stay on topic here though...Rendering sun light is primordial to me.

regards,
Kwistenbiebel
Thank you very much! :D
(you could answer on the topic I've linked :wink: )

Regarding your problem, unfortunately I don't know how to fix it, but I don't think it's a "bug" of the exporter. Maybe you should tweak the settings of the windows opacity like Whaat said to you; the rest is a matter of sun-positioning.
The last image you have posted seems normal... What exactly do you expect from it?

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kwistenbiebel
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Post by kwistenbiebel » Tue Feb 06, 2007 2:51 am

Afecelis,

In the sketchup exporter plugin you can assign 'blackbody' light to a material (in this case the glass material of the window surfaces). You can then set up two parameters: 'gain' and 'temperature'.
In the shot you are referring to gain=1 and temperature=3500K (warm light)......

But can we please get back on topic now ;)

I just like to know how i can get direct 'warm' sun light through a glass plane.

regards,

Kwistenbiebel

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kepler
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Post by kepler » Tue Feb 06, 2007 2:59 am

kwistenbiebel wrote:I just like to know how i can get direct 'warm' sun light through a glass plane.
Ok, now I have two ideas (maybe stupid, but here they are):

1. Change the white balance, look at this for reference;
2. Lower the sun on the horizon, you should have a more warm light temperature.

Hope it helps...

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kwistenbiebel
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Post by kwistenbiebel » Tue Feb 06, 2007 3:02 am

Thanks Kepler,
I will look in to that. For the moment 'white balance' is set to 'E'.

Here is the Sketchup view. You can see the direct sun light hitting the floor and parts of the wall.
This is what i want to simulate in the renderings as well.

Image

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kepler
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Post by kepler » Tue Feb 06, 2007 3:06 am

kwistenbiebel wrote:Thanks Kepler,
I will look in to that. For the moment 'white balance' is set to 'E'.

Here is the Sketchup view. You can see the direct sun light hitting the floor and parts of the wall.
This is what i want to simulate in the renderings as well.
Try to put the windows on another layer and then render without them as suggested. You should see the shadows of the window "frames" as in the Sketchup view. If it happens, then the problem is in the windows material (probably transparency setting).

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kwistenbiebel
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Post by kwistenbiebel » Tue Feb 06, 2007 3:06 am

radiance wrote:kwistenbiebel, are you flemish ?

radiance
yes, i live near antwerp.

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kwistenbiebel
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Post by kwistenbiebel » Tue Feb 06, 2007 3:26 am

sorry...double posting :oops:
Last edited by kwistenbiebel on Thu Feb 08, 2007 2:28 am, edited 1 time in total.

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kwistenbiebel
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Post by kwistenbiebel » Tue Feb 06, 2007 3:27 am

Problem solved.

I removed the glass from the windows and sun is shining .
Thank you guys for the help.
I will post the resulting image when it is done.
...Does this mean that inndigo has a 'sun through glass issue'?
Is there some glass setting that makes it possible. (a special glass as used in other unbiased render engines)?


Thanks again.

regards,
Biebel

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manitwo
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Post by manitwo » Tue Feb 06, 2007 3:30 am

turn of bidir in the infile if you wan't to render glas+sunlight.

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