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Refraction On a Translucent Sprite (Paper2d)


I would like some help figuring out why i cannot make a heat distortion particle work on a translucent sprite. It works just fine with a masked sprite though.

Problem is that even if i create a .tng file with a separate alpha channel it still looks super bad because i cannot make my backgrounds blend seamlessly together. It looks like i took a ruler and drawn a separation line between the two backgrounds. And i am running out of ideas on how to fake it on a 2d plane.

Could someone please help me with this because i cant find a single line of information about sprites and refraction

Note: I am a noob with materials so please be gentle. :)

Thank you!

Product Version: UE 4.9
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asked Dec 07 '15 at 09:48 PM in Rendering

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avatar image Roccinio Dec 09 '15 at 12:53 PM

Could someone please explain to me why translucent materials do not work with refraction and what can i do as a workaround to make them work?

This is the material.alt text

1.png (345.9 kB)
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Hi Roccinio -

I am going to assume that you are using an Orthogonal Camera. It's your Particle System's relationship to the Orthogonal Camera which is causing the Refraction to not redner. You material is setup correctly. We are currently working on an issue where particles are not rendering correctly in Orthogonal camera views, for reference UE-3602. I have added your information to the report and will keep you informed as we investigate a solution.

Thank You

Eric Ketchum

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answered Dec 09 '15 at 07:52 PM

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Lovecraft_K ♦♦ STAFF
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avatar image Roccinio Dec 09 '15 at 08:06 PM

Hello Eric,

No I am using perspective. I know for a long time that particles do not render with an orthogonal camera. Any ideas now that this got out of the way?

avatar image Lovecraft_K ♦♦ STAFF Dec 09 '15 at 08:19 PM

Hm, your material setup works correctly for me in Perspective. I have attached a test project can you take a look at it and see if you are getting the same results.

Test Project 4.10.1 Test Project 4.9.2

avatar image Roccinio Dec 09 '15 at 08:39 PM


I just tried it out in the default paper2d template and it works. Would you mind taking a look at the video I send you? :cry: link text

untitled.rar (5.1 MB)
avatar image Lovecraft_K ♦♦ STAFF Dec 10 '15 at 05:47 PM

Hi -

Uncheck Separate Translucency in your Translucency Sprite Material. You may have to copy the default Material and make a new one you can edit separately and also you may have to turn off separate Translucency for multiple stacked Translucent items to get the Sort Order correct. This should get you back up and running.

Thank You

Eric Ketchum

avatar image Roccinio Dec 10 '15 at 11:55 PM

Eric.. I owe you a beer!

A big THANK you from the bottom of my heart! Without you I wouldn't be able to figure this out not even in a million years.

For future reference this is what i believe caused my problem. Translucency and DoF don't work well together.

"I did some reading up on the Documentation page and found this little snippet of information that deals directly with the issue you are experiencing. The option 'Separate Translucency' within your material properties under the 'Translucency' section should resolve your issue.

Separate Translucency - This indicates that the Material should be rendered in the Separate Translucency Pass( This mean that this will not be affected by DOF and also requires bAllowSeparateTranslucency to be set in the .INI files).

By default this option is checked on when creating a Translucent Material. Simply uncheck the box for this option and you should be able to see the effects of DoF applied to the objects in your scene.

Andrew Hurley "

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