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Can Parallax Occlusion Mapping break a silhouette?

Can Parallax Occlusion Mapping break a silhouette? Or would you just use world displacement for that? What are the performance differences?

alt text

I'm looking to create this effect in unreal. But It keeps looking like its under glass.

This guy has a video, how is he doing this? https://www.youtube.com/watch?v=gcAsJdo7dME

How did neofur do it? https://www.youtube.com/watch?v=4pXBgsybn0s

It looks like there was some experimentation on this subject back in UE3. What happened to it? https://docs.unrealengine.com/udk/Three/DevelopmentKitGemsParallaxOccludedMapping.html

Where do I go to learn more?

Thank you for you time.

Product Version: UE 4.11
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asked Jun 23 '17 at 09:46 PM in Rendering

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psloand
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Hey psloand,

Download the Content Examples project which is free on the Learn tab in the Unreal Engine Launcher. There is a map in that project specifically designed to help you better understand how to work with Parallax Occlusion and the caveats to the system. I believe the map is called Parallax Occlusion Mapping. Use that as a good starting point for learning this rendering technique.

Cheers,

Andrew Hurley

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answered Jun 23 '17 at 09:54 PM

avatar image psloand Jun 24 '17 at 10:25 PM

Thank you Andrew this was very helpful.

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This guy has a video, how is he doing this? https://www.youtube.com/watch?v=gcAsJdo7dME

This guy in the video checks if resulting UV coordinates after POM, are above 1.0 or below 0.0. If so, he discards the pixel. You can get the same effect using masked material blend mode and set opacity to zero instead of discarding pixel, as it is not directly possible in UE4 material editor.

How did neofur do it? https://www.youtube.com/watch?v=4pXBgsybn0s

A wild guess would be that they are using geometry shader to generate shells/fins for fur rendering. In any case, it is quite complicated, and if you are really after this effect, you might want to consider licencing this plugin.

Where do I go to learn more?

Here. http://developer.amd.com/wordpress/media/2012/10/Dachsbacher-Tatarchuk-Prism_Parallax_Occlusion_Mapping_with_Accurate_Silhouette_Generation%28SI3D07%29.pdf

But it is somewhat advanced and generally requires proper programming and shader authoring skills.

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answered Jun 23 '17 at 10:24 PM

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Deathrey
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avatar image psloand Jun 24 '17 at 10:29 PM

Thank you Deathrey, You're right I still have a few more steps before I'm ready to interact with materials at that level. I appreciate your time thanks again.

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