Best use of global illumination in a game?
- Thread starter Ron Burgundy
- Start date
Screen-space reflections.
And for geometry that moves.
"Predictable" is a vague way of putting it. If a camera is above and parallel to a large flat surface, there's a good chance that much of what the surface needs to reflect is cleanly visible on-screen.
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forumaccount
Newcomer
Yes, true. A lot of the baking solutions can handle indirect lighting on things moving throughout the scene, but it will never be quite correct.
Yep. At the time of baking, photons were frolicking about the scene a certain way, describable in a lightmap. Getting dynamic objects to react to the lightmap is "easy." Getting the lightmap to react to dynamic objects is more problematic.
By lightmaps do you mean LPVs or Light Propagation Volumes, if my definition stands correct? Or are those terms a completely different thing?
Lightmaps are different (i.e. baked/static light sources applied to the world)
LPVs/Light Propagation Volumes (dynamic, generally used for single source e.g. sun):
Crytek's first implementation http://www.crytek.com/download/Light_Propagation_Volumes.pdf
Another iteration with cascades: http://www.vis.uni-stuttgart.de/~dachsbcn/download/lpv.pdf (kind of the same idea as cascade shadowmaps - nested grids with higher density of samples closer to camera, less with farther away).
UE4's "current" implementation
https://docs.unrealengine.com/lates...AndShadows/LightPropagationVolumes/index.html
UE4 Footnote said:
Fable Legends apparently does the secondary occlusion, IIRC. Kind of hoping they'll talk about it more.
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Many thanks, I feel so very lucky to be in this forum -it makes me feel proud of myself for being here-, surrounded by superb knowledgeable people from whom I want to learn things I can't quite understand yet, although one of my goals in life is learning about some more complex stuff related to computer science and technology via uni or worthy courses.. Thanks again, AInets!! -still reading the PDFs and the linked webpage-
The Crytek document should be relatively easy to follow, although no worries if skipping the math.
It does give a fairly comprehensible description of the method at least. The UE4 page just kind of goes over features at a fairly high-level, but maybe the footnotes are useful.
Global Illumination in the GDC 2015 (some examples)
Enlighten 3 - Subway (Unreal Engine 4 demo)
Lower quality:
Higher quality: http://www.geomerics.com/wp-content/...ten_Subway.mp4
HQ Mirror: https://mega.co.nz/#!XsxT3RIY!Ag0HUq...S7uz7DKx5ztnO0
http://www.geomerics.com/blogs/subway/
Forge - Lighting editor
http://www.geomerics.com/news/enligh...ds-of-artists/
Gradthrawn
Veteran
Tomorrow Children's GDC 2015 presentation. The presentation covers their approach to realtime GI. No video of the presentation is available that I'm aware of yet.
Very interesting 182 pages of slide and much more details. They give the task they do on in vertex and pixel shader and the task they do on compute.
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182 pages??? Can someone shorthand it for me? I'll only look at the pictures anyway.
Cones & Async Compute.
Pretty sure it's all been discussed before in an earlier PDF.
http://fumufumu.q-games.com/archives/2014_09.php#000934
He does give some performance figures for the GI method in the GDC presentation. There's a list of what's Graphics & Compute (in parallel).
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