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I am setting up a node tree in the Compositor for some post-production effects. I have the earth on one render layer and a UV sphere with stars and a Sun Object (emitting light) on another render layer. Now I have this effect when muting this Glare Node. The ID mask is for this Sun object.

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This looks allright to me. But when the Glare Node is activated then this horizontal glare beam looks like before instead behind the earth.

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I am quite sure the sun object is behind the earth (seen from the camera position). What is going wrong here ?

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Nothing is wrong, that's how glare works.

In real life, lens glare (or flare) is an effect produced by a camera or your eyes when looking at a very bright spot. It is caused by internal reflections and defects within the lens.

enter image description here
Image by cmwphotography.

Those streaks are not physical things in 3-dimensional space emitting light, they are introduced by the camera, so they can't appear behind anything, they are introduced onto the image within the lens.

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  • $\begingroup$ yes I know lens flare (I am a photographer). You are right .....stupid me (Grrrr))> Because of the name "glare" I thought it had something to do with the object but it's about the lens of course :) $\endgroup$
    – user13877
    Commented Mar 4, 2016 at 13:45
  • $\begingroup$ "Glare" because "flare" was taken ;-) $\endgroup$
    – 3pointedit
    Commented Mar 8, 2016 at 4:04

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