Distance Field Edge Blending

hallatore · April 10, 2017, 12:47am

Hi!

I’ve created a material function that blends the edge of the material. This is great for smoothing out the transition between rocks and the ground.
It only uses dithering so it has great performance.

Screenshots before/after (Remember to view in fullscreen)

How to use

Create a new Material Function.
Copy the code below and past it in the editor. Connect the If-output to the Output Result.
Open the material of the mesh you want to blend.
Add a MaterialFunctionCall and select the function you just created.
Connect the output to PixelDepthOffset of that material.
Make sure your mesh has Affect Distance Field Lighting turned off.

PS: Remember to set Generate Distance Fields in project settings to true.


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anonymous_user_76c29980 · April 10, 2017, 2:12am

Thank you! What did you use for the texture input?

MaryMassacre · April 10, 2017, 7:30am

Locks very nice, thx!
Do you think it’s possible to remove the black artifacts or reduce their size?
I’ll play arround with it and post my results.

hallatore · April 10, 2017, 8:00am

There is no texture input, just a dithering mask.

What black artifacts? Do you have any screenshots?

Seehr · April 10, 2017, 11:36am

Thank you a lot for sharing this.

Is there a way to make a workaround without deactivating the Distance Field Lighting?

hallatore · April 10, 2017, 11:44am

Here is another good example of the effect. Distance Field Edge Blending - Unreal Engine - Imgsli

ON/OFF

And here is the difference between the two.

hallatore · April 10, 2017, 11:48am

DistanceToNearestSurface doesn’t differentiate between itself and other objects. So if you don’t turn it off for that object you get artifacts/blending where the object occludes itself.
So I don’t think that is possible.

Seehr · April 10, 2017, 11:50am

Makes sense.

This is a bit expensive for a dynamic setup anyway… So i guess it’s even normal that you deactivate the DFL.

Thanks a lot for sharing it, Hallatore.

CoquiGames · April 10, 2017, 12:58pm

Very nice share! Thank you!

hallatore · April 10, 2017, 3:17pm

Updated the material to adjust based on camera distance, and tweaked some of the logic. I really like the result!

AP_Studios · April 10, 2017, 5:17pm

Just wondering -

Whats the loss? FPS/MS with/without?

anonymous_user_76c29980 · April 10, 2017, 5:29pm

Can this be done in version 4.11? I can’t seem to get this to work. I’ve followed every step exactly as put. Could you post a screenshot of your material editor?

hallatore · April 10, 2017, 5:46pm

I get 90/93 FPS with/without the function.

I’m not sure. I’m on 4.15, haven’t tested earlier versions.
The MF screenshot is further up. And in the rock material I just call this MF and link it with PixelDepthOffset.

Do you see anything if you click View / Visualize / Mesh DistanceFields? I think there has to be at least one object there. I had some weird behavior if the scene had no objects in the distance fields.

anonymous_user_76c29980 · April 10, 2017, 7:07pm

I don’t see anything when I visualize Mesh DistanceFields. Could that be the problem? I already have the box checked next to generate distance fields in my project settings.

anonymous_user_76c29980 · April 10, 2017, 7:46pm

Figured out my problem! I needed to increase the distance in my MF and change the texture output to a noisy image I’ve made it PS.

http://i1104.photobucket.com/albums/h329/SWolf89/ScreenShot00005_zpssoad9i2j.png

MaryMassacre · April 10, 2017, 8:27pm

Hi! Forget about my post, works very well!
Thx for sharing!

Concerning the performance, it should be possible to add a material without PDO and/or reduced distance field resolutions for lower LODs.
Unfortunately I don’t have much time this week to test it, maybe by end of the week. Just an idea.

hallatore · April 11, 2017, 4:08pm

I’m wondering if it’s theoretically possible for DistanceToNearestSurface to exclude the distance field of itself. Or if the whole distance field is one big volume so you can’t differentiate between.
Would be nice to get this feature to work regardless of the object itself has distance fields turned on or off.

Maybe @RyanB or @DanielW knows?

anonymous_user_f2b8b290 · April 11, 2017, 4:38pm

There’s only one global distance field which you access with DistanceToNearestSurface and it costs a lot to build and maintain. That said we could implement something like distance field channels as a project setting (so you only pay the cost when enabled).

hallatore · April 12, 2017, 7:28am

Putting the landscape in a channel would open a lot of nice little possibilities.
Right now the biggest problem is that DistanceToNearestSurface also checks against itself, so you get artifacts with the edge blending method above.

issam1975 · April 15, 2017, 12:54am

can this be used with flat meshes, (roads, airport runways, …etc ) ?