Linedef type 144

A translucent, intangible from top FOF.

Linedef type 144, Intangible from Top, Translucent, is a type of translucent floor over floor platform which can be fallen through from above, but not jumped through from below. It is useful for making vertical one-way routes.

Setup

The flats, floor height, and ceiling height of the FOF are determined by the flats, floor height, and ceiling height of the control sector, and the sidedefs of the FOF's walls are determined by the sidedef of the control linedef.

The alpha value of this FOF's translucency can be changed by setting the control linedef's front side upper texture to the number symbol (#), followed by a three-digit decimal number, from 000 to 255. #000 is completely invisible, and #255 is completely opaque. Note that in the Software renderer, there are actually only eleven different values: #000–#011, #012–#037, #038–#063, #064–#088, #089–#114, #115–#139, #140–#165, #166–#191, #192–#216, #217–#242, #243–#255, where #000–#011 is invisible, and #243–#255 are opaque. The advantage of using the completely opaque values is the ability to properly render flats which contain transparent pixels. If no value is set in the front side upper texture, however, the default alpha value of #128 will be used.

The light level of the control sector will determine the brightness of the shadow cast by the FOF. If the light level of the control sector is lower than that of the target sector, then it will cast a dark shadow. If the light level of the control sector is higher than that of the target sector, then the FOF will illuminate the area below it. If the light level of the control sector is equal to that of the target sector, then the FOF will not affect the light of the area below it.

If Flag [7] / No Midtexture Skew / Effect 2 is checked, the inside will be rendered as well. If Flag [6] / Not Climbable is checked, the FOF will not cast a shadow.

Sample

Example file: ex_ld144_fofintangiblefromtoptranslucent.wad (MAP01)

How to use

You may load this file into your favorite map editor, such as Zone Builder. Select MAP01 as the map to load. You may also load this file in the game: Save ex_ld144_fofintangiblefromtoptranslucent.wad into the addons folder of your SRB2 directory. Start SRB2, go to the Addons menu, and then select ex_ld144_fofintangiblefromtoptranslucent.wad. Start the game in Single Player mode. Press the Console button (~), and type in the command MAP MAP01 to access the example map. When you load this file in the game, it replaces Greenflower Zone Act 1.