Volumetric lighting: Difference between revisions

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'''Volumetric lighting''', also known shorthand as "God rays", is a lighting technique meant to simulate light bouncing off fog or dust particles in the air, such as a warehouse or foggy beach. It makes the player see beams of light shining from the sun or other light sources. Currently, the only {{valve|4}}-made software running on {{Source|4}} that supports Volumetric Lighting is {{sfm|4}}, however [[Strata Source|some third-party engines]] incorporate volumetric lighting into {{ent|env_projectedtexture}}. If the game you are making maps for doesn't support volumetric lighting, you can use some workarounds seen [[WiseVol|here]].
__NOTOC__
{{split|Somewhere down the line, this page ended up being used to document volumetric fog in addition to volumetric lighting…}}
'''Volumetric lighting''' is a lighting technique meant to simulate light bouncing off fog or dust particles in the air, such as a warehouse or foggy beach. It makes the player see beams of light shining from the sun or other light sources. Currently, the only {{valve|4}}-made software running on {{Source|4}} that supports Volumetric Lighting is {{sfm|4}}, however [[List_of_third-party_Source_games|some third-party engines]] incorporate volumetric lighting into {{ent|env_projectedtexture}}. If the game you are making maps for doesn't support volumetric lighting, you can use some workarounds seen [[WiseVol|here]].


Most versions of {{Source2|4}} have support for Volumetric lighting by default
Most {{Source2|4}} games have support for Volumetric lighting by default.


==Media==
==Media==
<div style=width:100%;overflow:auto>
{| border="0" cellpadding="5"
|[[File:Sfm volumetrics.png|380px|thumb|center|Volumetric lighting in Source Filmmaker]]
|[[File:Deferred volumetrics.png|380px|thumb|center|Volumetric lighting in Alien Swarm Deferred]]
|[[File:Des_volumetrics.png|380px|thumb|center|Volumetric lighting in Portal 2: Desolation]]
|[[File:Hlvr-sfm-volumetrics.png|380px|thumb|center|Volumetric lighting in Half Life Alyx]]
|}
</div>
<div align="center" style=width:100%;overflow:auto>
{| border="0" cellpadding="4"
{| border="0" cellpadding="4"
|[[File:Sfm volumetrics.png|500px|thumb|center|Volumetric lighting in SFM]]
|[[File:volumetric_projected_texture_p2ce.jpg|400px|thumb|center|Volumetric lighting in Portal 2: Community Edition]]
|{{todo|alien swarm deferred}}
|{{todo|hl alyx}}
|}
|}
</div>


==Native Support==
==Native Support==
Line 18: Line 28:
! Game !! Supports
! Game !! Supports
|-
|-
| {{src04|4}}<br>{{src06|4}}<br>{{src07|4}}<br>{{src09|4}}/{{srcmp|4}}<br>{{src13|4}}<br>{{hls|4}}<br>{{dods|4}}<br>{{hl2|4}}<br>{{hl2ep1|4}}<br>{{hl2ep2|4}}<br>{{as|4}}<br>{{asrd|4}}<br>{{hldms|4}}<br>{{hl2dm|4}}<br>{{hl2lc|4}}<br>{{css|4}}<br>{{tf2|4}}<br>{{portal|4}}<br>{{l4d|4}}<br>{{l4d2|4}}<br>{{portal2|4}} || NO
| {{src04|4}}<br>{{src06|4}}<br>{{src07|4}}<br>{{src09|4}}/{{srcmp|4}}<br>{{src13|4}}<br>{{hls|4}}<br>{{dods|4}}<br>{{hl2|4}}<br>{{hl2ep1|4}}<br>{{hl2ep2|4}}<br>{{as|4}}<br>{{asrd|4}}<br>{{hldms|4}}<br>{{hl2dm|4}}<br>{{hl2lc|4}}<br>{{css|4}}<br>{{tf2|4}}<br>{{portal|4}}<br>{{l4d|4}}<br>{{l4d2|4}}<br>{{portal2|4}}<br>{{bms|4}} || {{No}}
|-
|-
| {{bms|4}} || YES
| {{asd|4}}<br>{{apex|4}}<br>{{p2d|4}} || {{Yes}}
|-
|-
| {{asd|4}} || YES
| {{sfm|4}}<br>{{strata|4}} || {{Yes|Yes ({{ent|env_projectedtexture}})}}
|-
| {{sfm|4}} || YES
|-
| {{strata|4}} || YES ({{ent|env_projectedtexture}})
|-
| {{apex|4}} || {{N/A}}
|}
|}
==={{src2|4}}===
==={{src2|4}}===


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! Game !! Supports
! Game !! Supports
|-
|-
| {{hlalyx|4}} || YES
| {{hlalyx|4}} || {{Yes}}
|-
| {{cs2|4}} || {{Yes}}
|-
|-
| {{cs2|4}} || YES
| {{sbox|4}} || {{Yes}}
|}
|}
==Using models/textures to fake volumetric lighting==
<div style=width:100%;overflow:auto>
{| border="0" cellpadding="4"
!  !! Using vollight_stainedglass.mdl !!
|[[File:Fakemdl vol mviever.png|500px|thumb|center|Model in Hammer]]
|[[File:Mdlvoludem.png|500px|thumb|center|Model in engine]]
|}
</div>
<div style=padding-left:28px;width:99%;overflow:auto;>
{| border="0" cellpadding="4"
!  !! Using vol_light128x128.mdl !!
|[[File:128x vollight inhammer.png|500px|thumb|center|Model in Hammer]]
|[[File:128x vollight in.png|500px|thumb|center|Model in engine]]
|}
</div>
{{Note|On [[DirectX Versions|DirectX]] 9, volumetric lighting on Old Engine was slightly less visible compared to using DX8 level. However, the volumetric lighting on New Engine DX9 was even less visible (or nearly invisible) compared to Old Engine's DX9. This is likely due to a bug (or changes to the lighting) on Source 2007 and later.{{Cite|1}}{{Cite|2}}}}
{| class=standard-table
!  !! Old Engine !! New Engine ({{src13|name}})
|-
| DirectX 8.1 (and earlier) || [[File:Trainstation volumetric DX81 Source 2006.jpg|Volumetric lighting on Old Engine - DirectX 8.1 ({{code|dxlevel 81}})|512px]] || [[File:Trainstation volumetric DX81 Source 2013.jpg|Volumetric lighting on New Engine - DirectX 8.1 ({{code|dxlevel 81}})|512px]]
|-
| DirectX 9.0+ || [[File:Trainstation volumetric DX95 Source 2006.jpg|Volumetric lighting on Old Engine - DirectX 9.0+ ({{code|dxlevel 95}})|512px]] || [[File:Trainstation volumetric DX95 Source 2013.jpg|Volumetric lighting on New Engine - DirectX 9.0+ ({{code|dxlevel 95}})|512px]]
|}
{{references|1=
{{ref2|cite id=1|Jasper Carmack ({{Twitter|@JasperCarmack|icon=hide}}) (April 3, 2024). "{{Twitter|JasperCarmack/status/1775312261743079483|Comparing the differences between Half-Life 2 (Legacy / "DX8" shaders) on the left and (Modern) DX9+ shaders on the right.|icon=hide}}". ''{{twitter}}''. Retrieved {{#time: F d, Y }}.}}
{{ref2|cite id=2|Jasper Carmack ({{Twitter|@JasperCarmack|icon=hide}}) (April 3, 2024). "{{Twitter|JasperCarmack/status/1775370362198601835|When loading the save for comparison, you need to wait a little bit because the light glows are scripted to come on after a delay. So 1 {{=}} dx8, 2 {{=}} dx9 on load, 3 {{=}} dx9 after 5 seconds|icon=hide}}". ''{{twitter}}''. Retrieved {{#time: F d, Y }}.}}
}}


== See also ==
== See also ==
Line 48: Line 88:


== External links ==
== External links ==
{{empty}}
*[https://www.youtube.com/watch?v=ybSYhHx84xI YOUTUBE How To Create Sunbeams using Volumetric Fog in Source 2 Hammer]
* [https://www.youtube.com/watch?v=hzn0cms5atU Volumetric lighting imitation trick with env_projectedtexture and translucent models (showcase)]
* [https://www.youtube.com/watch?v=sGArfKK-DXg Volumetric lighting imitation trick with env_projectedtexture and translucent models (tutorial)]
*{{w|Volumetric_lighting|Volumetric lighting}}
[[Category:Graphics]]
[[Category:Glossary]]
[[Category:Technical]]

Latest revision as of 10:22, 3 October 2024

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Split-arrows.png Split

It has been suggested that this article or section be split into multiple articles: Somewhere down the line, this page ended up being used to document volumetric fog in addition to volumetric lighting…. (Discuss)

Volumetric lighting is a lighting technique meant to simulate light bouncing off fog or dust particles in the air, such as a warehouse or foggy beach. It makes the player see beams of light shining from the sun or other light sources. Currently, the only Valve Valve-made software running on Source Source that supports Volumetric Lighting is Source Filmmaker Source Filmmaker, however some third-party engines incorporate volumetric lighting into env_projectedtexture. If the game you are making maps for doesn't support volumetric lighting, you can use some workarounds seen here.

Most Source 2 Source 2 games have support for Volumetric lighting by default.

Media

Volumetric lighting in Source Filmmaker
Volumetric lighting in Alien Swarm Deferred
Volumetric lighting in Portal 2: Desolation
Volumetric lighting in Half Life Alyx
Volumetric lighting in Portal 2: Community Edition

Native Support

Source Source

Game Supports
Source 2004 Source 2004
Source 2006 Source 2006
Source 2007 Source 2007
Source 2009 Source 2009/Source Multiplayer Source Multiplayer
Source 2013 Source 2013
Half-Life: Source Half-Life: Source
Day of Defeat: Source Day of Defeat: Source
Half-Life 2 Half-Life 2
Half-Life 2: Episode One Half-Life 2: Episode One
Half-Life 2: Episode Two Half-Life 2: Episode Two
Alien Swarm Alien Swarm
Alien Swarm: Reactive Drop Alien Swarm: Reactive Drop
Half-Life Deathmatch: Source Half-Life Deathmatch: Source
Half-Life 2: Deathmatch Half-Life 2: Deathmatch
Half-Life 2: Lost Coast Half-Life 2: Lost Coast
Counter-Strike: Source Counter-Strike: Source
Team Fortress 2 Team Fortress 2
Portal Portal
Left 4 Dead Left 4 Dead
Left 4 Dead 2 Left 4 Dead 2
Portal 2 Portal 2
Black Mesa Black Mesa		 No
Alien Swarm Deferred Alien Swarm Deferred
Apex Legends Apex Legends
Portal 2: Desolation Portal 2: Desolation		 Yes
Source Filmmaker Source Filmmaker
Strata Source Strata Source		 Yes (env_projectedtexture)

Source 2 Source 2

Game Supports
Half-Life: Alyx Half-Life: Alyx Yes
Counter-Strike 2 Counter-Strike 2 Yes
S&box S&box Yes

Using models/textures to fake volumetric lighting

Using vollight_stainedglass.mdl
Model in Hammer
Model in engine
Using vol_light128x128.mdl
Model in Hammer
Model in engine
Note.pngNote:On DirectX 9, volumetric lighting on Old Engine was slightly less visible compared to using DX8 level. However, the volumetric lighting on New Engine DX9 was even less visible (or nearly invisible) compared to Old Engine's DX9. This is likely due to a bug (or changes to the lighting) on Source 2007 and later.[1][2]
Old Engine New Engine (Source 2013)
DirectX 8.1 (and earlier) Volumetric lighting on Old Engine - DirectX 8.1 (dxlevel 81) Volumetric lighting on New Engine - DirectX 8.1 (dxlevel 81)
DirectX 9.0+ Volumetric lighting on Old Engine - DirectX 9.0+ (dxlevel 95) Volumetric lighting on New Engine - DirectX 9.0+ (dxlevel 95)


References

References

See also

External links

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