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Unreal Engine Livestream - An Introduction to Alembic - Sept 21 - Live from Epic HQ

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  • replied
    The head uses ABC to import the engine, and the body is the skeleton used. But after importing UE4, the animated data of head and body can not match.

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  • replied
    thanks alot just got time finally to get on


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  • replied
    alembic file ,Too many faces can't import animation. Is this a BUG?

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  • replied
    in fortnite how they load both animation and attach head on body and run complete animation?

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  • replied
    alembic crash my engine or hang my pc during import many time i tried diffrent abc files same issue

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  • replied
    Also hey, does anyone know any good tips for keeping Alembic file sizes low? I swear it goes up so high. Is it a matter of too many vertices? Too many frames? Cant find n e info

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  • replied
    Hey @Sam or @TimHobson - did you guys solve the Material ID issue with Alembic Skeletal? Killing me on this destructible as it's giving me like 60 Material IDs :\

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  • replied
    Hi

    Does Alembic work on android/ios ? i know its heavy but does it work ?

    Thanks

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  • replied
    This is interesting - is there a way to set a geometry cache to a specific frame? I want to be able to drive the frame position with a timeline.

    Thanks!

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  • replied
    Originally posted by adriano.ol View Post
    About Fortnite, why only the heads were Alembic? Is it not possible to use the whole body animation for cinematics like that?
    I ask that because I want to render a short in Unreal with characters animated in Blender. Using Alembic for the whole character animation would be a dream.
    Hi Adriano. There are a couple of reasons why the heads were separated from the body. Unreal's implementation of FBX into the engine will only support 8 influences per vertex. While this is sufficient for most game scenarios, it was too limiting when trying to achieve really nice facial performances on a character.

    The separated head deployed a 201 joint facial rig with blendshapes and lattices to give animators to full advantage of Maya's deformation capabilities. The deforming mesh, when exported as an alembic file was brought into UE4 as a skeletal mesh and streamed during playback in realtime. The character bodies, however, were FBX files who's game skeletons were enhanced by ART v2.0 tools by adding additional leaf nodes that could be driven in engine by anim physics. The 8 influence limitation wasn't a huge deal for the bodies.

    Could the characters be entirely alembic cached? Sure. But then you'd loose all that secondary animation goodness that anim physics provides.

    I'll be giving a talk at Montreal Dev Days next Thursday (9/28) to discuss the Fortnite Pipeline. It will be recorded and made available after the event.

    Brian J. Pohl
    M&E Solutions Engineer - North America
    Epic Games - Enterprise Team

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  • replied
    As promised:


    VFX Guide to the Fortnite Cinematic Trailer.
    https://www.fxguide.com/featured/a-fortnite-at-epic/

    NVIDIA Feature Development branch:
    https://developer.nvidia.com/nvidia-gameworks-and-ue4

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  • replied
    Thanks for that tutorial! Was very informative.

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  • replied
    Indeed, great topic.
    Few questions.
    1) Is there a way (or plans to..) handle motion blur for alembic-cached geometry?
    for example, we have imported whole character as alembic-geo-cache. This character is running through the scene. But without motion blur at all . We assume that it because Unreal just can't handle motion blur on animated geometry cached data.. Is it correct? May be you can recommend some tricks to fake it though..

    2) Please describe a bit new upcomming feature - "streaming alembic cache from disk". As of name itself - it sounds pretty **** good!! we waiting for it so much!))

    3) How about supporting USD (universal scene description from Pixar) file format? Can we use geometry cache from it? and whats the pro/cons/ and difference of using both..
    thank you.
    - Sergelove
    Last edited by robocop; 09-21-2017, 04:39 AM.

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  • replied
    Can you please tell me the correct scaling for Alembic from Blender?

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  • replied
    Interesting questions about using Alembic. More information on work done on Fortnight would be great. I'd like to know what else can you achieve by using alembic that you can't achieve with other file types.

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