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I'm creating a small solar system where i would like to show the dark and the bright side of the the earth. My problem is that when i see the earth from behind, to show the dark side, there appears a light around the edges (first picture, only in eevee). But i would like to see it just all dark. If i put down specular in the light settings to 0, i get the desired result (second picture) but then i miss the reflection on the earth.

I tried it with a spot, sun and a point lamp. with the point lamp it works, but it does not work for the whole project. The problem appears with a sun and also a spot lamp.

Does anyone know how to solve this?

enter image description here

enter image description here

Thanks for the detailed information. Unfortunately it didnt solve the problem. I opened a complete new blend file with a new uv sphere, no materials added at all. and there i got the same effect, but only if the light is in a certain distance from the uv sphere.

enter image description here

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  • $\begingroup$ Uhm do you have a background image/color, like HDRI ? Also what size is your earth. If it's larger than your light source's radius, I imagine this might happen too. What results do you get from cycles rendering? $\endgroup$
    – DarkSoul
    Oct 5, 2021 at 16:33
  • $\begingroup$ i have no background image or color. As the background should be just black and there is only 1 exact light source, i thought it may disturb the restult. but i will try a HDRI. I played with the radius, and also made it smaller, but if it is too small, the light source reflects as a light pulb on the surface. Cycles rendering works perfectly, but my computer is to slow to render an animation with cycles. $\endgroup$
    – Paul Häni
    Oct 5, 2021 at 18:06
  • $\begingroup$ Hmmm. Have you tried removing all the materials to see if the shadows work normally? If yes, then I think you need to check your earth' materials. If not, are you able to share your blendfile? $\endgroup$
    – DarkSoul
    Oct 5, 2021 at 22:27
  • $\begingroup$ please share your blend file $\endgroup$
    – Chris
    Oct 6, 2021 at 7:09
  • $\begingroup$ yes i tried to remove all the materials. Here is the blendfile: <img src="https://blend-exchange.com/embedImage.png?bid=Qkem38Br" /> $\endgroup$
    – Paul Häni
    Oct 6, 2021 at 11:51

2 Answers 2

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I created a new blend file to see if I could recreate your issue. I created a light, and sphere with no materials and I got it:

enter image description here

To fix this you need to select your light source and enable "Contact Shadows"

enter image description here

It took a little time to figure this out, lol.

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  • $\begingroup$ That's it! Wow thanks a lot for your time and effort, thats really great and will save me a headache :) $\endgroup$
    – Paul Häni
    Oct 6, 2021 at 18:49
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I found the issue. Your Bump map strenght was too strong. Here I have some images:

I placed some random noise textures in the bump node and saw that the light of the sun reaches the backof it. This is because the Bump value is way too high. The same goes for the moon, except your moon uses a displacement value.

It's very easy to oversee this issue.

Image 1.

I you adjust it to a lower value, you will get your desired result as seen here:

enter image description here

Notice how the shadows look normal now? I usually keep the Bump strenght to 1 and lower the distance value a lot. Try playing with these settings to what suits you.

Hope this helps!

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