Overblown exterior when rendering. (Ways to improve dynamic range)

[frankliu]

Hello! This is my first post on this forum.

 

I've searched around but haven't really found a solution.

As you can see, my scene is lit decently (still new-ish), but the exterior is completely blown out. I have one VraySun targetted into the room, and here's my settings for my VrayCamera and the render settings.

 

I suspect that the camera is capturing the indoor lighting correctly, but due to DR, it's blowing out the exterior. I would like to achieve something similar to this: Interior Scene

 

Any ideas? Thanks!

 

My settings

 

My Scene

 

[vinametalmetal]

Hello,

 

Remember to use Exponential on color mapping. Enable Clamp color value 10.

Use SUn multiplier 0,15 + skylight on the environment slot.

Set vray light on the window, skylight portal and check simple to avoid glass interrupt the light. 24 subdivision to solve the noise(splotches) in dark áreas, like behind the table. The store with irradiance map will create a better results, but if you dont have time you can enable to 3x fater render but loss of detail on shadows and light paths.

Use vrayphysical câmera, and increase ISO, after decrease Shutter to 40 ~ 20 if not good decrease F number to 6,2 or 5,6.

Ok.

[Ismael]

In that Tutorial you pointed; "Making Interior Scene" by Kuba Dabrowski,

the 'Environment' seen through the glass openings is a plane with a

VrayLight material applied and the Environment image used to color the light.

He right-clicks on the plane and sets the GI sections of the Vray properties

as this:

 

 

 

Visible to GI unchecked means that it will not affect the lighting you already have

in the interior of the room. Notice he reduced 'Receive GI' to 0.1? A photographer

would fill the room with light to bring it closer to the levels produced by the Sun

outside and he can them accomodate the interior/exterior in 1 exposure shot. Here,

the author of the tutorial and you would be visually adjusting the Sun light contribution.

 

Remember to add/remove lights as needed in order to obtaing your desired visual result.

[cg_Butler]

You could try just pasting your background in using photoshop. It won't get rid of your overbright parts of the render but colour mapping will do that.

[notamondayfan]

Just look at real photography, you would expect the outside to be blown out, as the camera would be setup to capture the interior, rather than the exterior. Camera don't have a high dynamic range, so in your case you would expect the outside to be blow out.

 

On the example from evermotion you posted, the ratio of window to wall is different to yours too, so in these cases you are more likely to see the environment, as the difference in light levels from interior to exterior is a lot less than your scene.

 

If you start making your scene have the background visible, then it's going to look false and fake. Contrast is good!

[theeastcoastwest]

As Dean said, a camera taking that same shot in the real world would most likely "blow-out" the exterior view as well. I use planes with a vraylightmtl applied to them containing the images I want to be visible most of the time, and it works well. You are given the option to adjust brightness to match with the rest of your scene however you should choose.

 

On another note, vray does render a very large dynamic range of pixel values. If you save your render as an open exr file, containing the full 32 bit linear image, you can do post production in a HDR program capable of tone mapping. By tone mapping your image, you are effectively "condensing" the lower range values and the higher range values into an acceptable mid-ground image. Your shadows will be lighter and show more detail, and your highlights won't be blown. I would recommend Photomatix pro if you choose to try that option. Its only $100.00, and has a very user friendly interface. It's options and controls are superior to that of Photoshop's in my opinion.