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Can a material cast shadows but not receive them

I am trying to set up some advanced foliage for a scene and was wondering if there was a way for a specific material to cast shadows (like leaves) but not themselves receive them (but still receive traditional lighting from other sources)

Thanks in advance,

Alex

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asked Jul 16 '14 at 08:14 AM in Rendering

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Dralex789
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avatar image Osok Dec 10 '14 at 04:10 AM

I would like to know this as well.

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I've managed to solve this problem for myself, so hopefully you can make use of my solution. I'm using emissive color to overcome the self-shadowing. Hopefully the next UE4 update will finally include a toggle for 'Receive Shadow'

Here's the material I'm using for my leaves: alt text

And here's how it looks like in a test scene (It's the trees in the red circles): alt text

The material even looks good from the ground: alt text

The 2 trees are built using different methods and both look ok using this material: alt text

Hopefully this has helped you. :)

leaves_bp.jpg (63.2 kB)
tree_ground2.jpg (78.8 kB)
test_shadows2.jpg (98.4 kB)
tree_3d_2.jpg (98.9 kB)
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answered Dec 31 '14 at 01:16 PM

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TempDN3
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avatar image Dralex789 Jan 05 '15 at 05:50 PM

This is actually the solution I found on my own heh. Not a perfect solution but it works well enough when lit during the day. It does unfortunately create some weird issues in darker scenes but it is definitely a start.

avatar image Matheus Souza Feb 11 '17 at 08:08 PM

You have change the vertex normal ?(tree)

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