Env screenoverlay

一个env_screenoverlay 与贴图 effects/combine_binocoverlay 的效果，在d2_coast_03.

env_screenoverlay是一个存在于所有的起源游戏的点实体。可以显示和控制在屏幕上的覆盖贴图,用来显示在玩家屏幕上。适合制造醉酒效果以及传送残影或者提示。

注意:In

, screen overlays are disabled by default. You must set r_drawscreenoverlay 1 to enable.

在源代码中，它由 class CEnvScreenOverlay 代表，定义于 env_screenoverlay.cpp。

Materials

You can use any material as an overlay, but UnlitGeneric materials are the least likely to have any visual bugs.

Valve provides these materials in the /effects folder:

Red teleport shimmer

tp_eyefx/tpeye3: Blue teleport shimmer
tp_eyefx/tp_eyefx: Warped distortion, somewhat similar the one seen on strider charge shots.
tp_eyefx/tp_black: Black. A thin border around the overlay is still visible.
tp_eyefx/tp_eyefx_eli: Flashing animation of three figures. Hardly usable as an overlay.

These materials are not designed as screen overlays, but will work as one:

debug/yuv: Monochrome (Black and white)
effects/com_shield002a.vmt: The combine shield shader effect - refraction with drifting squares.
models/effects/portalfunnel_sheet: Red-yellow-green scrolling ground overlay
models/props_combine/portalball001_sheet: Green downward haze
effects/tp_refract: Red/Orange Refractive overlay
glass/glasswindow_refract01: As if looking through a glass Observation window from Portal

Overlay Name 1 (OverlayName1) ([todo internal name (i)]) to Overlay Name 10 (OverlayName10) <字符串(en)>: Name of the first overlay material to display.

Overlay Duration 1 (OverlayTime1) ([todo internal name (i)]) to Overlay Duration 10 (OverlayTime10) <浮点型(en)>: Amount of time that the overlay should be displayed for, after which it will begin showing the next overlay. Setting this to -1 will make the entity display the overlay indefinitely, until it's forced to change by an input.

SwitchOverlay <整数(en)>: Switch to displaying a specific overlay. Pass in the desired overlay number in the parameter. Entering -1 as the value will cause the overlay to display indefinitely.