Physical sky with stars and clouds


#1

Hi,

I cannot show both clouds and stars together in the physical sky. When I change the time from day to night I see only stars, not clouds. When I change it back to day, stars disappear and clouds appear. Is this how it works or do I miss something? I just want to create a black sky with colorful clouds and bright stars without using any plugins.

By the way, what is sky objects in physical sky?

Thanks


#2

Have you tried … Sky … Example Scenes … Bright Night ?


#3

Thanks for the suggestion. This does not work for me. I need pure black sky and neon colored clouds with bright stars. However, whatever I tried, either the clouds are very light or the stars disappear.

Actually, I achieved pure black sky with colored clouds but I cannot add stars in the physical sky.

Is it possible to add anything behind the physical sky? I tried to add stars seperately, but it seems like the physical sky is always the furthermost.


#4

Your answer is to do this in a compositor having rendered out stars and coloured clouds as separate passes.


#5

You could put clouds and stars on individual planes …


#6

Thank you. Are the clouds from the physical sky? Could you please share the project file?


#7

Star Bkg and Clouds are from google images … there is no Phy s Sky … just alpha’d planes
and landscape for dark foreground images.


#8

How do you render the alpha channel with the physical sky? When I render it, the sky is ignored and it is all black.


#9

I have no idea how you setup your scene ?
Upload your scene and I’ll look at it.

Example below is PS, Star jpg on plane, and Cloud with alpha, lum and trans
so you see stars behind cloud.


#10

I used physical sky to generate clouds. I don’t want to replace it with images, because they are perfectly shaped for the job. I just want to add stars to the black sky. But I cannot do it. This is very simple and it is not possible in a program elaborate like Cinema 4D. I don’t understand.

Anyway, I decided to try this in compositing with After Effects. But I cannot render the physical sky with alpha. It is completely ignored. So, I cannot put stars behind the clouds. Why? Is there a setting?

I cannot upload an example. It says new users cannot send attachments. :frowning:


#11

Since the clouds are bright you can make a pseudo alpha channel from them by desaturating then raising the contrast until the image is B&W.

Are you new to compositing? It’s a fairly simple task to ADD or Overlay the stars over the clouds and use the pseudo alpha channel to knock out the stars behind the clouds if needed.


#12

Yes I’m new. Just started working on very recently for a personal project. I tried creating alpha of the clouds and put stars behind but did not like the result because it messed with the colors. I liked your idea. I will try it and I’m sure it will work better. Thanks.