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Creating Sun Rays is always a struggle. Today, I am trying to create rays coming from below around silhouettes produced with transparent PNGs - reusing several tips I found on here.

And it seems that the rays are going down rather than up...

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In this setup, the light comes from an emission plane, above which are silhouettes.

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The World Compositing setup.

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The Volumetric environment.

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Unfortunately, when I render the rays seem to come from above and mask part of the silhouettes! On this render, it is obvious that the emission is way below the silhouettes.

How do I make the rays come from the Emission object?

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Sun beams node works with normalized screen space coordinates, where (X0.5; Y0.5) is the Camera's midpoint.

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Your current point (X0.7; Y1.1) is way out of the screen. Try something like (X0.5; Y0.25) - it will be lower part of the screen, where is light coming from.

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  • $\begingroup$ Thanks, but how do I do that? In a panel, menu...? $\endgroup$ – MicroMachine Feb 7 '19 at 0:22
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    $\begingroup$ "Sun beams node" is in your Compositor setup: left value is X coordinate, another one is Y $\endgroup$ – Serge L Feb 7 '19 at 0:23
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    $\begingroup$ Oh - gotcha. Weird that these values don't have a name/label. Thanks $\endgroup$ – MicroMachine Feb 7 '19 at 0:24
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    $\begingroup$ If you hover mouse cursor on these values, you'll get a tooltip "...bla, bla image width&height", but I agree about proper XY labels $\endgroup$ – Serge L Feb 7 '19 at 0:29

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