Linedef type 142

A translucent, intangible from bottom FOF with no sides.

Linedef type 142, Intangible from Bottom, Translucent, No Sides, is a type of translucent floor over floor platform which can be jumped through and onto from below, but is solid to anything landing on it from above. This FOF renders the floor and ceiling, but not the sides. It is useful for making vertical one-way routes where the sides would not be viewed anyway. Since the side textures are not drawn, it requires less CPU power to render.

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.

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, whereas #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 is opaque. The advantage of using the completely opaque values is the ability to properly render flats which use 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 of the FOF will be rendered as well. If Flag [6] / Not Climbable is checked, this FOF will not cast a shadow.

Sample

Example file: ex_ld142_fofintangiblefrombottomtranslucentnosides.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_ld142_fofintangiblefrombottomtranslucentnosides.wad into the addons folder of your SRB2 directory. Start SRB2, go to the Addons menu, and then select ex_ld142_fofintangiblefrombottomtranslucentnosides.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.