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Topic Starter Topic: question: light map

Trainee
Trainee
Joined: 11 Feb 2016
Posts: 46
PostPosted: 03-24-2016 05:05 PM           Profile   Send private message  E-mail  Edit post Reply with quote


what is a light map? or a light image?
do i make it in photoshop? is it like an alpha channel?
I googled it a couple times and came up with nothing.
anybody know?




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I'm the dude!
I'm the dude!
Joined: 04 Feb 2002
Posts: 12254
PostPosted: 03-24-2016 08:35 PM           Profile Send private message  E-mail  Edit post Reply with quote


https://en.wikipedia.org/wiki/Lightmap

In regards to Q3, they are automatically generated by the compiler Q3Map2, stored in the BSP file, and are subtractively filtered over the base texture.



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GtkRadiant | Q3Map2 | Shader Manual


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Mercenary
Mercenary
Joined: 15 Feb 2010
Posts: 208
PostPosted: 03-26-2016 05:14 AM           Profile Send private message  E-mail  Edit post Reply with quote


Texture only "fullbright" (r_fullbright 1; vid_restart)


+

Lightmap only (r_lightmap 1)


=

Textures & Lightmap combined



A Lightimage (shader related) is a simple texture. It's average color is used to generate the color of the light emitted by the shader surface.



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Q3A Maps - by sst13
Quake Live Workshop


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Boink!
Boink!
Joined: 19 Apr 2003
Posts: 4493
PostPosted: 03-26-2016 05:32 AM           Profile Send private message  E-mail  Edit post Reply with quote


Awesome demo shots to explain the effect of a lightmap... neat.




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Mercenary
Mercenary
Joined: 15 Feb 2010
Posts: 208
PostPosted: 03-26-2016 06:29 AM           Profile Send private message  E-mail  Edit post Reply with quote


It's also possible to view vertex-light only with: "r_vertexlight 1; r_fullbright 1; vid_restart"



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Q3A Maps - by sst13
Quake Live Workshop


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