Making an image the background??

redbyte · Post by **redbyte** » Sun Jun 15, 2008 11:13 pm

Hi guys,
I'm looking for a way to make this plane

appear bright and unaffected by light and shadows.

At the moment I have it as a simple diffuse material with a UV texture, and it looks like this:

Which looks okay I guess... but I'd like it to not show any shadows or differing brightness.

Does anyone know how I would go about doing this?

I would do it in post pro, but as you can see in the above render, there are large panes of glass that are reflecting the interior so I don't think it would be possible.
How does everyone else do their backgrounds for archiviz?

Thanks in advance!
If you can solve this I'll be very greatful

Kram1032 · Post by **Kram1032** » Sun Jun 15, 2008 11:38 pm

to get propper shadows on it, model it

Or set the sun BEHIND the plane, which will cause that the WHOLE plane looks shadowed.... Don't forget, it's still a flat surface, thinner than paper. No way that the shadows on it look entirely correct

PureSpider · Post by **PureSpider** » Mon Jun 16, 2008 12:01 am

He does NOT want to have shadows on it...

Kram1032 · Post by **Kram1032** » Mon Jun 16, 2008 12:04 am

oh, missread xD
One way would be to make it a textured emitter... Though, you have to be careful that it doesn't get overbright, then...

BbB · Post by **BbB** » Mon Jun 16, 2008 3:19 am

The way to do this is to model just a plane, not a series of planes at an angle like you have here. These will always show shadows.
So just one plane, quite distant from the scene and oriented so that it catches the full light of the sun.
For UV-mapping, go into camera view and use "UV-Unwrap from view" so you don't have any distortion. Of course, things look better if the plane is more or less perpendicular to the camera.

redbyte · Post by **redbyte** » Mon Jun 16, 2008 9:23 am

Kram1032 wrote:oh, missread xD
One way would be to make it a textured emitter... Though, you have to be careful that it doesn't get overbright, then...

Sounds promising. But can you have a sunlight and an emitting material in the same scene?? I thought you could only have one or the other?

PureSpider · Post by **PureSpider** » Mon Jun 16, 2008 9:28 am

You can have both ^^
Just think "real"... You can always turn on a flashlight while the sun is shinig... the point is, you can't see the ray very good... but it works

Kram1032 · Post by **Kram1032** » Tue Jun 17, 2008 8:52 am

yeah.... you'll have to use energy rates, being close to those, coming from the sun. - probably, as it's supposed to be "sunlit", you'd need the exact same energy...

Sun-energy-calculator, anyone? xD

BbB · Post by **BbB** » Tue Jun 17, 2008 10:15 am

In generally the plane is so vast it doesn't work as an emitter. Too faint because of the size.

Kram1032 · Post by **Kram1032** » Tue Jun 17, 2008 10:22 am

I think that depends on your emitter mode... shouldn't it work if you use simple gain? - with efficiency, the power gets scaled over the whole plane but with gain it should work just fine...

BbB · Post by **BbB** » Tue Jun 17, 2008 10:29 am

You're right. In that case it would work.

redbyte · Post by **redbyte** » Wed Jun 18, 2008 10:33 am

Au contrair! It worked!

Here's the settings I used:

and the result:

So thanks for the help guys. Worked a treat

One more question: along the top center of the background it seems to be reflecting the sun, giving it that 'blown out' look. Is there a way to turn the expononent (?) off, for that plane? Or make it diffuse? So that it isn't affected by light?

I hope someone understands what I mean

Kram1032 · Post by **Kram1032** » Wed Jun 18, 2008 10:40 am

If the plane is an emitter, it wont reflect anything anymore. That can only be because your map is too white up there

Btw: Very nice background but why did you change it?

redbyte · Post by **redbyte** » Wed Jun 18, 2008 12:34 pm

Kram1032 wrote:If the plane is an emitter, it wont reflect anything anymore. That can only be because your map is too white up there
Btw: Very nice background but why did you change it?

Oh okay. I check out the original image.

And I changed it because I needed something high res to see the effect properly. The one in the OP was a 'comp' (very low res for testing purposes) from iStockImages.
I'll buy the full thing shortly and replace it, coz the beach works so much better than the city

Kram1032 · Post by **Kram1032** » Thu Jun 19, 2008 12:35 am

IC

If you have clamped HDRshots (meaning that they're LDR which try to fake HDR) which avoid pure black and white, this might be a way to partly get a pseudo-HDR-illumination. (Combined with sun+sky)

You should try to match the beach time with the sun position if you can...

Making an image the background??

Making an image the background??

Done!

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