$treeSway

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$treeSway is a shader effect available in <Counter-Strike: Global Offensive>, [Portal 2], <Insurgency>, <Left 4 Dead 2>, <Left 4 Dead>, <Alien Swarm>

<Team Fortress 2> (As of Jungle Inferno update), <Garry's Mod> (as of October 2018).

Description

When this shader effect is added, it will make the material morph around to an env_wind entity to give it the effect that it's blowing in the wind, this effect is used for the trees in <Counter-Strike: Global Offensive> and various foliage seen in <Insurgency>. The effect assumes that the model is facing upwards, and the commands specify how much it should be affected by the env_wind entity. By default this shader is disabled in the <Alien Swarm> SDK, however it can be re-enabled in a mod.

Only compatible with VertexLitGeneric.

Note:In <Team Fortress 2>, does not require env_wind if $treeSwayStatic is set to 1.
Bug: In <Garry's Mod>, projected textures shining on materials with this parameter while it is morphing around will cause the whole material to flicker. $halflambert can sometimes partially fix this, but it might be better to keep the materials a distance away so that the player's flashlight can't reach them, or put them in the 3D Skybox.

Parameters

$treeSway                         "0" "1" or "2"
//Changes the treesway effect. 0 is no sway, 1 is classic tree sway, 2 is an alternate, radial tree sway effect.
//Tree sway mode 2: Hacks to use tree sway code on rectangular sheets of plastic/tarp attached at the four corners. 
//Inverts the sway scale radius to be 1 at (0,0,0) in model space and fall off radially towards the edges of the model.
//The model is expected to be built lying in the X Y plane in model space, with its center at the origin.

$treeSwayHeight                   "float"    //The height in which the effect is applied.
$treeSwayStartHeight              "float"    //The height from the origin in which the effect starts blending in.
$treeSwayRadius                   "float"    //The radius from the origin in which the effect is applied.
$treeSwayStartRadius              "float"    //The radius from the origin in which the effect starts blending in.
$treeSwaySpeed                    "float"    //The speed multiplier of large movement such as the trunk.
$treeSwayStrength                 "float"    //The distance multiplier of large movement such as the trunk.
$treeSwayScrumbleSpeed            "float"    //The falloff of the effect on small movement such as the trunk. Higher means a more stable center.

$treeSwayScrumbleStrength         "float"    //The speed multiplier of the small movement such as the leaves.
$treeSwayScrumbleFrequency        "float"    //The distance multiplier of the small movement such as the leaves.
$treeSwayFalloffExp               "float"    //The frequency of the rippling of a sine wave in small movement such as the leaves.
$treeSwayScrumbleFalloffExp       "float"    //The falloff of the effect on small movement such as the leaves. Higher means a more stable center.

$treeSwaySpeedHighWindMultiplier  "float"    //Speed multiplier when env_wind triggers a gust.
$treeSwaySpeedLerpStart           "float"    //Minimum wind speed in which a gust triggered by env_wind will start affecting the material.
$treeSwaySpeedLerpEnd             "float"    //Minimum wind speed in which a gust triggered by env_wind will fully affect the material.
$treeSwayStatic                   "boolean"  //Whether or not to instead use a static wind value instead of the values from env_wind. TF2 only.