Interior Renderings - Exposure for Background Outside

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Fletch
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Interior Renderings - Exposure for Background Outside

Post by Fletch » Tue May 03, 2011 10:47 pm

Getting the exposure right for an image seen through a window when rendering an interior can make a big difference in how realistic that image will appear.

It is important to keep in mind and to use the Exposure Control in the Camera Tab in the Render Dialog Box.

Consider these real-world photo examples. Notice that if the interior of the room is shot dark, that the exterior viewed through the window is exposed in such a way that the objects outside are understandable:
Image
Notice that if the exposure of the camera is changed so that the room itself can be viewed in good lighting, the exterior becomes quickly overexposed:
Image

In Subject: Master Bedroom
We can see in this great image by revered SketchUp artist and well-respected Twilight Render artist Tomyong that the external exposure doesn't match with what our eyes expect:
Image

An attempt at correcting the exposure in post-pro was some-what successful, but it would be even better if the external exposure were done in the scene setup, eliminating need for much post-pro.
Image

So, to increase the exposure on the exterior image:
Adjust exposure in the "Post-Process: Tone Mapping" area of the Render Dialog while rendering.
Set the background image you have inserted onto a backplate plane inside your SU model and set it to be a Light Emitter material template set to type:"fake" with power starting at 200watts/m2 (may vary depending on the scene and camera/tone map settings)

Example of real photo demonstrating interior vs exterior lighting with photographic exposure.
Image

xjhossefx
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Re: Interior Renderings - Exposure for Background Outside

Post by xjhossefx » Wed Nov 26, 2014 7:34 am

Disculpa, no entiendo en que parte pongo esos valores, en post-porcess?

pbacot
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Re: Interior Renderings - Exposure for Background Outside

Post by pbacot » Wed Nov 26, 2014 5:18 pm

Wow. Nice example and info! Thanks!

Fletch
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Re: Interior Renderings - Exposure for Background Outside

Post by Fletch » Thu Nov 27, 2014 10:45 am

xjhossefx wrote:Disculpa, no entiendo en que parte pongo esos valores, en post-porcess?
Exposure es en post-process, si.
Set the image inside your SU model and set it to be a fake light emitter starting at 200watts/m2 (may vary depending on the scene)
eso es en "Template Materials",

First insert your background image into SketchUp as an image, then explode it. Then modify the material properities of this background image texture using "Template Materials" dialog from the Twilight Render toolbar.
google mis-translation into Spanish to follow :lol: :
Primero insertar su imagen de fondo en SketchUp como una imagen, luego explote él. A continuación, modifique los Properities materiales de este fondo de la imagen de textura mediante diálogo "Materiales de plantilla" de la barra de herramientas de Twilight Render.

xjhossefx
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Re: Interior Renderings - Exposure for Background Outside

Post by xjhossefx » Fri Nov 28, 2014 9:53 pm

aya es para que una imagen fondo se vea medio blanquito con la platilla emisor cierto? XD, yo estaba pensando que los valores que están en las imágenes f2.8 iso 200 se ponía en algún lugar de la cámara :P

Fletch
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Re: Interior Renderings - Exposure for Background Outside

Post by Fletch » Sat Nov 29, 2014 2:04 pm

Have you watched the video tutorials?
¿viste los tutoriales en vídeo?

xjhossefx
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Re: Interior Renderings - Exposure for Background Outside

Post by xjhossefx » Wed Dec 03, 2014 6:45 am

Si eh visto todo los vídeos tutoriales de la pagina : P
If eh seen all the tutorial videos of page : P

Fletch
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Re: Interior Renderings - Exposure for Background Outside

Post by Fletch » Wed Dec 03, 2014 5:25 pm

I'm sorry, google translate failed to translate your question above. I do not speak spanish, but I can understand a little what is written. In this case, I don't understand the question or questions at all. :oops:

cballtgh
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Re: Interior Renderings - Exposure for Background Outside

Post by cballtgh » Thu Mar 26, 2015 5:37 pm

As I understand it using Easy 09 is sometimes the best option when rendering an interior scene like the one here. But the Easy 09 option does not allow you to use a Fake Emitter, and using an LEM will add greatly to the render time. Is there another way to achieve this effect when using Easy 09?

Chris
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Re: Interior Renderings - Exposure for Background Outside

Post by Chris » Thu Mar 26, 2015 5:43 pm

With the unbiased settings, Interior and Interior+, light emitting materials don't considerably add to render time. There may be some increase but it's not likely to be much.

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