Skydome problem

[Db1]

Hi everyone,

 

Unfortunatly my first ever post on this forum is about a problem...

I'm trying to visualize a design project (school) I'm currently working on.

After some reading on the web I found out about skydomes. I followed jeff pattons tutorial about setting up a skydome.

 

I used a jpg image and boosted output gamma up to around 400.

 

When I rendered the scene it was blue...(see picture)

I tried to fix it by switching mrSun & Sky on and off, adjusted exposure values but all without the desired result.

 

How can I get the color to look 'normal' ?

[datacrasher]

What i useally do is create a half sphere and a normal map to flip the normals to the inside then add the texture to the sphere.

 

from the look of yours you need to change the Material to white it's looks like the material when you appily (assign) it is blue just change the Material to a white.

 

Tony

[Matt McDonald]

you might need to use the Environment/Background Switcher. set your background rays to be the bitmap and your environment rays to be the MR Physical Sky.

 

If you hunt down a third party ray switcher you might be able to find one which lets you use your bitmap for the background + reflections and just the MR Physical Sky for environment lighting.

[Joel Gray]

If you're following Jeff Patton's tutorials then you should put the output back to 1 on your JPG. Then go into 'Environment and Effects' and change the 'Whitepoint' to a higher value (7000 or 8000 I'm guessing). If you get a black render then you'll want to make sure the Physical Scale of your light is set to unitless (under Environment tab, mr Photographic Control), then give it a value of somewhere between 80000 and 90000. You can also adjust the color and saturation under the Sky/Sun parameters, Non-Physical Tuning (the 'mr Sky Advanced Parameters' rollout). A positive value in the 'Red/Blue Tint' will make the scene warmer (less blue) and a negative value will be cooler (less red), and a lower Saturation' amount may also help.

 

edit: all of these suggestions assume that you're using the mr Photographic Exposure control.

[trackie23]

in terms of realism, that image actually looks pretty accurate to me...the image for the sky is very very blue, so the scene should be very very blue, especially with your buildings being assigned a white color, which it seems like they are, and with the brightest portion of the sky coming from behind the buildings...think about in real life how the time of day (just before dusk) can give everything a blueish hue. Also, think about how your sky image is lighting the scene; the whitest parts of the sky image are behind the buildings, so you're not going to get a lot of white light striking the building.

 

the quick fix is to use the background/enviornment switcher with mrsky as elevation suggested or adjust in post with an alpha channel. This would also be physically inaccurate. In my opinion, I would adjust the sky image to make the brighter portion be behind the camera, and thereby illuminate the building with whiter light, and the dark blue portion of the sky be behind the building. you can actually see the effect I'm going for right there in your image, on the far right the building is more illuminated by the whiter portion of the sky image

Edited September 5, 2011 by trackie23