Community Tutorial: UMG thru Post Process Materials

General Tutorial & Course Discussions
1

A technique for rendering dynamic or non-dynamic UMG widgets thru a Post Process material.

https://dev.epicgames.com/community/learning/tutorials/vJXk/unreal-engine-umg-thru-post-process-materials

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2

What is the Over function being used here? Don’t see that in the instructions for the material creation.

3

Hi JoeyPepperoni,

The Over node in the material graph comes from the Composure Plugin. Just enable Plugins->Composure in your project plugins and the over functionality will become available to you.

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4

Got it working. Thank you!

Is there a way to use this technique to have widgets that are in the world space not be affected by post processing?

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You can try putting the post process material as the top layer the Post Process Material Stack on your Post Processing Volume. I am not sure if you need to toggle the “Manually Redraw” option off or not in the Blueprint.

6

Thanks @Lucky_Monk57 , this helps a lot! Is there any way to get the current Sequence Shot details in the UMG Blueprint (as with the Movie Pipeline)? So I can incorporate Shot Frame, Focal Length, etc.

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Thanks a lot for this tutorial ! Your are great !
I’m using the widget to monitoring my virtual camera but I’m stil looking to have the possibility to change values in editable text box. I see that if I add this widget to viewport, it can’t add to post-process. Do you know if I can do both : add to viewport and post process in the same time ?
JD

9

Hello,

I figure out that alpha channel is different when I use your tutorial. For exemple, I have a blue box with alpha set as 0.2. I can see this box in the preview windows but I didn’t on my monitor. Like something like the gamma is different.

I notice also that I need to convert RGB channel from linear to sRGB to get this good color. I expect a similar conversion for alpha channel to get the good transparency. To fix it, I try like this :

image
image1384Ă—783 122 KB

I use media capture, I output in sRGB. I’m also using ocio to monitor my viewport in REC709.

Thanks for your help
Julien D.

10

To get this to work, I had to take the function out of the construction script and add it to begin play instead - and add some delays after the sequence pins. But I am really struggling with colors not being correct and motion blur, see my post here.