== Introduction ==
This tutorial explains how to set up a triggering system with three sounds: a starting sound, a looping sound and a stopping sound. This can be used for machines that can be turned on/off or for other sound systems that behave in a similar way. There is more than one way to do this but here we use a simple trigger system with a custom made sound shader.

== What to do ==
You’ll have to find some sounds that fit your machine, here I’ll use these:

sound/machinery/generators/generator_start_01.ogg
sound/machinery/generators/generator_loop_01.ogg
sound/machinery/generators/generator_stop_01.ogg

The start and loop sound can be combined into a soundshader like this:

machine_on
{
looping
leadin
sound/machinery/generators/generator_start_01.ogg
sound/machinery/generators/generator_loop_01.ogg
}

After the first sound is played, the second sound will start looping. Save this soundshader in your Doom 3/darkmod/sound folder as machine_on.sndshd.

Open your map in Darkradiant import the machine_sounds_system prefab from the prefab/mechanical folder. Read [[Start/Loop/Stop sounds#How the prefab works|how the prefab works]] for an explanation on this prefab.

For speaker_machine_stop set “s_shader” to sound/machinery/generators/generator_stop_01.ogg. For speaker_machine_start set “s_shader” to machine_on. That’s all there is.

== How the prefab works ==
When machine_lever is used it triggers speaker_machine_start, playing the sounds in the machine_on soundshader. The lever also triggers OnOffCount, this trigger counts the times it has been triggered itself. Because the “count” property of OnOffCount has been set to 2 it will only fire its target, speaker_machine_stop, the second time it is triggered.
The second time the lever is used it triggers speaker_machine_start turning it off. OnOffCount triggers speaker_machine_stop. With “repeat” set to 1 OnOffCount will start counting all over again if it’s triggered the amount of times set with “count”. OnOffCount acts as a reverse trigger so to say.

Decals

2008-11-24T19:52:18Z

Flanders: /* Some other decal properties */

==Introduction==
Decal textures are used to add a layer of partially transparent texture to another surface. For example: dirt on the ground or stains on a wall. When you take a look at the decal textures in the darkmod folder you'll see that they have a white, yellow or purple background, those areas are transparent.

==Decal creation==
To create decals, select the surface you want to make a decal for (in select face mode or with {{key|SHIFT}}+{{key|CTRL}}+{{LMB}}). Press the “create Decals for selected Faces” button, it will create a [[patch]] for each selected face, which will be exactly in the same plane. Another way to create a decal is create [[patch]] yourself and place it were you want. Assign a texture to it from the Media browser, the texture browser or with the surface inspector.

==Decal placement==
Decals can be placed co-planar on surfaces or with a tiny offset. During development of your mission it might be useful to place decals with a small offset. This way they don't cause z-fighting errors in dark radiant. Drawback is that the player camera could get in between the decal and the actual face, which can happen if the player is leaning into that wall or getting real close. Co-planar decals do NOT cause z-fighting errors in game, they use a blending filter so they blend with the surface they are placed on. However, if you place a texture on it without a blend filter it will cause a z-fighting error as any other two colliding surfaces.
All the decals in the darkmod/decals and in the Doom3/decals folders have a blend filter.

== Some other decal properties ==
* Decals do not cast shadows.
* Decals are nonsolid, the player won't collide with them, weapons go right through them.
* Decal materials won't seal against the void.
* Decal textures can be applied to a brush (if there is any use for it).

{{editing}}

Decals

2008-11-23T14:13:10Z

Flanders: Decals

==Introduction==
Decal textures are used to add a layer of partially transparent texture to another surface. For example: dirt on the ground or stains on a wall. When you take a look at the decal textures in the darkmod folder you'll see that they have a white, yellow or purple background, those areas are transparent.

==Decal creation==
To create decals, select the surface you want to make a decal for (in select face mode or with {{key|SHIFT}}+{{key|CTRL}}+{{LMB}}). Press the “create Decals for selected Faces” button, it will create a [[patch]] for each selected face, which will be exactly in the same plane. Another way to create a decal is create [[patch]] yourself and place it were you want. Assign a texture to it from the Media browser, the texture browser or with the surface inspector.

==Decal placement==
Decals can be placed co-planar on surfaces or with a tiny offset. During development of your mission it might be useful to place decals with a small offset. This way they don't cause z-fighting errors in dark radiant. Drawback is that the player camera could get in between the decal and the actual face, which can happen if the player is leaning into that wall or getting real close. Co-planar decals do NOT cause z-fighting errors in game, they use a blending filter so they blend with the surface they are placed on. However, if you place a texture on it without a blend filter it will cause a z-fighting error as any other two colliding surfaces.
All the decals in the darkmod/decals and in the Doom3/decals folders have a blend filter.

== Some other decal properties ==
* Decals do not cast shadows.
* Decals are nonsolid, the player won't collide with them, weapons go right through them.
* Since decals are patches, they won't seal against the void.
* Decal textures can be applied to a brush (if there is any use for it).