Translucent material reflections? (UE4.10)
Translucent materials don't receive reflections, e.g.
(1) Open the LightRoom marketplace demo.
(2) Add a 'Basic sphere' about a metre away from the glass vase in the back of the room (in the darkest part of the room).
(3) Add the glass material used on the vase to the sphere.
(4) Search the content browser for 'Blueprint_Effect_Fire' and drag it in between the vase and the sphere.
The sphere object and vase do not receive reflections.
However, if you make the sphere glass material 'Opaque' then you get the reflection.
Is this this the old 'need forward rendering' limitation, a bug or something else?
Ok, I found it. What you need to do is enable Screen Space Reflections on the Translucency tab in your materials properties. I don't believe this is on by default within the material.
answered Dec 04 '15 at 02:32 PM
It is possible to get reflections. They are not going to be as vivid because of how translucent materials are designed. Translucent materials are designed to allow for a certain amount of light to pass through the surface as opposed to bouncing light off like opaque materials.
Here is an image to better reflect, no pun intended, what I mean when I say light passes through these objects.
A more scientific diagram showing how light reflects off of more opaque surfaces.
This is a test I made in UE4 4.10 showing that translucent objects do reflect the world around them just not to the degree that solid/metallic/smooth objects do.
This is why you see less reflections in translucent objects. Certain things can affect this such as roughness, specularity, metallic properties, and refraction. Try looking at this documentation that could help with further questions you may have about translucent materials.
answered Nov 30 '15 at 09:11 PM
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