42 lines
1.6 KiB
Markdown
42 lines
1.6 KiB
Markdown
|
# Materials: Commands {#mat_commands}
|
||
|
|
## fogparms
|
||
|
|
### Syntax {#syntax}
|
||
|
|
|
||
|
|
**fogParms <red value> <green value> <blue value> <distance to opaque>**
|
||
|
|
|
||
|
|
### Overview {#overview}
|
||
|
|
|
||
|
|
**Note**: you must also specify "surfaceparm fog" to cause
|
||
|
|
[vmap](vmap) to identify the surfaces inside the volume.
|
||
|
|
Fogparms only describes how to render the fog on the surfaces.
|
||
|
|
|
||
|
|
**<red value> <green value> <blue value>** These are normalized values.
|
||
|
|
To obtain the values that define fog color divide the desired color's
|
||
|
|
Red, Green and Blue values by 255 to obtain three normalized numbers
|
||
|
|
within the 0.0 to 1.0 range.
|
||
|
|
|
||
|
|
**<distance toopaque>** This is the distance, in game units, until the
|
||
|
|
fog becomes totally opaque, as measured from the point of view of the
|
||
|
|
observer. By making the height of the fog brush shorter than the
|
||
|
|
distance to opaque, the apparent density of the fog can be reduced
|
||
|
|
(because it never reaches the depth at which full opacity occurs).
|
||
|
|
|
||
|
|
### Notes {#notes}
|
||
|
|
|
||
|
|
- The fog volume can only have one surface visible (from outside the
|
||
|
|
fog).
|
||
|
|
- Fog must be made of one brush. It cannot be made of adjacent
|
||
|
|
brushes.
|
||
|
|
- Fog brushes must be axial. This means that only square or
|
||
|
|
rectangular brushes may contain fog, and those must have their edges
|
||
|
|
drawn along the axes of the map grid (all 90 degree angles).
|
||
|
|
|
||
|
|
**Design Notes:**
|
||
|
|
|
||
|
|
- If a water texture contains a fog parameter, it must be treated as
|
||
|
|
if it were a fog texture when in use.
|
||
|
|
- If a room is to be filled completely with a fog volume,it can only
|
||
|
|
be entered through one surface (and still have the fog function
|
||
|
|
correctly).
|
||
|
|
- Additional shader passes may be placed on a fog brush, as with other
|
||
|
|
brushes.
|