These directives only affect the texture when it is seen in the Radiant editor. They have no effect on the surface in-game. They should be grouped with the surface parameters but ahead of them in sequence.
This directive creates a shader name in memory, but in the editor, it displays the TGA art image specified in qer_editorImage (in the shader below this is, textures/eerie/lavahell.tga).
The editor maps a texture using the size attributes of the TGA file used for the editor image. When that editor image represents a shader, any texture used in any of the shader stages will be scaled up or down to the dimensions of the editor image. If a 128x128 pixel image is used to represent the shader in the editor, then a 256x256 image used in a later stage will be shrunk to fit. A 64x64 image would be stretched to fit. Be sure to check this on bouncy, acceleration, and power-up pads placed on surfaces other than 256 x 256. Use tcMod scale to change the size of the stretched texture. Remember that tcMod scale 0.5 0.5 will double your image, while tcMod scale 2 2 will halve it.
textures/liquids/lavahell2 //path and name of new texture
{
qer_editorImage textures/eerie/lavahell.tga //based on this
qer_nocarve //cannot be cut by CSG subtract
surfaceparm noimpact //projectiles do not hit it
surfaceparm lava //has the game properties of lava
surfaceparm nolightmap //environment lighting does not affect
q3map_surfacelight 3000 //light is emitted
tessSize 256 //relatively large triangles
cull disable //no sides are removed
deformVertexes wave 100 sin 5 5 .5 0.02
fogparms 0.8519142 0.309723 0.0 128 128
{
maptextures/eerie/lavahell.tga //base texture artwork
tcMod turb .25 0.2 1 0.02 //texture is subjected to turbulence
tcMod scroll 0.1 0.1 //the turbulence is scrolled
}
}
Design Notes:
The base_light and gothic_light shaders contain numerous uses of this. It can be very useful for making different light styles (mostly to change the light brightness) without having to create a new piece of TGA art for each new shader.
A brush marked with this instruction will not be affected by CSG subtract functions. It is especially useful for water and fog textures.
This directive defines the percentage of transparency that a brush will have when seen in the editor (no effect on game rendering at all). It can have a positive value between 0 and 1. The higher the value, the less transparent the texture. Example: qer_trans 0.2 means the brush is 20% opaque and nearly invisible.
Design Notes:
On GtkRadiant 1.4 and earlier, if the shader uses qer_trans and a qer_editorImage with an alpha channel, the transparent areas of the editorImage will be 100% transparent. To keep the solid areas of the editorImage opaque, use a near 1 value for qer_trans (eg. 0.9999). This is useful for grates, windows, fences, etc. If using GtkRadiant 1.5 or later, use qer_alphaFunc for editorImage masking instead.
This directive is only supported by GtkRadiant 1.5 based editors. This is used when you have an alpha channel in the editorImage that you want to appear as an alpha mask in the editor. qer_alphaFunc by itself does not get filtered with qer_trans. This is useful for grates, windows, fences, etc.
I'm not sure if other functions and values are supported, but it seems as if it only really uses a single function/value, qer_alphaFunc gequal 0.5.
