Today I put together a shader that will make grass + trees move as if in the wind, without having anything to do with the terrain. It’s base is the Transparent Cutout Diffuse shader. I figured I’d share it with you guys since I spent weeks looking for a good shader like this with no success, so I made it myself.
Here is a video of the shader in action, in scene view applied to the leaf material of this tree:
http://gyazo.com/0507d1048ead73b6b1cb0c3c6b7a96da.mp4
The wind is customizable on each material so you can have the desired amount of movement.
There are TWO versions of the shader. The 1st one is similar to the Transparent Cutout Diffuse shader. the 2nd one has Illumination. It gives it a different look, some may prefer the second one for their tree leaves.
Here is the 1st One:
Shader "Transparent/Cutout/Diffuse Shake" {
Properties {
_Color ("Main Color", Color) = (1,1,1,1)
_MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
_Cutoff ("Alpha cutoff", Range(0,1)) = 0.5
_ShakeDisplacement ("Displacement", Range (0, 1.0)) = 1.0
_ShakeTime ("Shake Time", Range (0, 1.0)) = 1.0
_ShakeWindspeed ("Shake Windspeed", Range (0, 1.0)) = 1.0
_ShakeBending ("Shake Bending", Range (0, 1.0)) = 1.0
}
SubShader {
Tags {"Queue"="AlphaTest" "IgnoreProjector"="True" "RenderType"="TransparentCutout"}
LOD 200
CGPROGRAM
#pragma target 3.0
#pragma surface surf Lambert alphatest:_Cutoff vertex:vert addshadow
sampler2D _MainTex;
fixed4 _Color;
float _ShakeDisplacement;
float _ShakeTime;
float _ShakeWindspeed;
float _ShakeBending;
struct Input {
float2 uv_MainTex;
};
void FastSinCos (float4 val, out float4 s, out float4 c) {
val = val * 6.408849 - 3.1415927;
float4 r5 = val * val;
float4 r6 = r5 * r5;
float4 r7 = r6 * r5;
float4 r8 = r6 * r5;
float4 r1 = r5 * val;
float4 r2 = r1 * r5;
float4 r3 = r2 * r5;
float4 sin7 = {1, -0.16161616, 0.0083333, -0.00019841} ;
float4 cos8 = {-0.5, 0.041666666, -0.0013888889, 0.000024801587} ;
s = val + r1 * sin7.y + r2 * sin7.z + r3 * sin7.w;
c = 1 + r5 * cos8.x + r6 * cos8.y + r7 * cos8.z + r8 * cos8.w;
}
void vert (inout appdata_full v) {
float factor = (1 - _ShakeDisplacement - v.color.r) * 0.5;
const float _WindSpeed = (_ShakeWindspeed + v.color.g );
const float _WaveScale = _ShakeDisplacement;
const float4 _waveXSize = float4(0.048, 0.06, 0.24, 0.096);
const float4 _waveZSize = float4 (0.024, .08, 0.08, 0.2);
const float4 waveSpeed = float4 (1.2, 2, 1.6, 4.8);
float4 _waveXmove = float4(0.024, 0.04, -0.12, 0.096);
float4 _waveZmove = float4 (0.006, .02, -0.02, 0.1);
float4 waves;
waves = v.vertex.x * _waveXSize;
waves += v.vertex.z * _waveZSize;
waves += _Time.x * (1 - _ShakeTime * 2 - v.color.b ) * waveSpeed *_WindSpeed;
float4 s, c;
waves = frac (waves);
FastSinCos (waves, s,c);
float waveAmount = v.texcoord.y * (v.color.a + _ShakeBending);
s *= waveAmount;
s *= normalize (waveSpeed);
s = s * s;
float fade = dot (s, 1.3);
s = s * s;
float3 waveMove = float3 (0,0,0);
waveMove.x = dot (s, _waveXmove);
waveMove.z = dot (s, _waveZmove);
v.vertex.xz -= mul ((float3x3)_World2Object, waveMove).xz;
}
void surf (Input IN, inout SurfaceOutput o) {
fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
o.Albedo = c.rgb;
o.Alpha = c.a;
}
ENDCG
}
Fallback "Transparent/Cutout/VertexLit"
}
2nd one with Illumination:
Shader "Transparent/Cutout/Self Illum Diffuse Shake" {
Properties {
_Color ("Main Color", Color) = (1,1,1,1)
_MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
_Illum ("Illumin (A)", 2D) = "white" {}
_Cutoff ("Alpha cutoff", Range(0,1)) = 0.5
_ShakeDisplacement ("Displacement", Range (0, 1.0)) = 1.0
_ShakeTime ("Shake Time", Range (0, 1.0)) = 1.0
_ShakeWindspeed ("Shake Windspeed", Range (0, 1.0)) = 1.0
_ShakeBending ("Shake Bending", Range (0, 1.0)) = 1.0
}
SubShader {
Tags {"Queue"="AlphaTest" "IgnoreProjector"="True" "RenderType"="TransparentCutout"}
LOD 200
CGPROGRAM
#pragma target 3.0
#pragma surface surf Lambert alphatest:_Cutoff vertex:vert addshadow
sampler2D _MainTex;
sampler2D _Illum;
fixed4 _Color;
float _ShakeDisplacement;
float _ShakeTime;
float _ShakeWindspeed;
float _ShakeBending;
struct Input {
float2 uv_MainTex;
float2 uv_Illum;
};
void FastSinCos (float4 val, out float4 s, out float4 c) {
val = val * 6.408849 - 3.1415927;
float4 r5 = val * val;
float4 r6 = r5 * r5;
float4 r7 = r6 * r5;
float4 r8 = r6 * r5;
float4 r1 = r5 * val;
float4 r2 = r1 * r5;
float4 r3 = r2 * r5;
float4 sin7 = {1, -0.16161616, 0.0083333, -0.00019841} ;
float4 cos8 = {-0.5, 0.041666666, -0.0013888889, 0.000024801587} ;
s = val + r1 * sin7.y + r2 * sin7.z + r3 * sin7.w;
c = 1 + r5 * cos8.x + r6 * cos8.y + r7 * cos8.z + r8 * cos8.w;
}
void vert (inout appdata_full v) {
float factor = (1 - _ShakeDisplacement - v.color.r) * 0.5;
const float _WindSpeed = (_ShakeWindspeed + v.color.g );
const float _WaveScale = _ShakeDisplacement;
const float4 _waveXSize = float4(0.048, 0.06, 0.24, 0.096);
const float4 _waveZSize = float4 (0.024, .08, 0.08, 0.2);
const float4 waveSpeed = float4 (1.2, 2, 1.6, 4.8);
float4 _waveXmove = float4(0.024, 0.04, -0.12, 0.096);
float4 _waveZmove = float4 (0.006, .02, -0.02, 0.1);
float4 waves;
waves = v.vertex.x * _waveXSize;
waves += v.vertex.z * _waveZSize;
waves += _Time.x * (1 - _ShakeTime * 2 - v.color.b ) * waveSpeed *_WindSpeed;
float4 s, c;
waves = frac (waves);
FastSinCos (waves, s,c);
float waveAmount = v.texcoord.y * (v.color.a + _ShakeBending);
s *= waveAmount;
s *= normalize (waveSpeed);
s = s * s;
float fade = dot (s, 1.3);
s = s * s;
float3 waveMove = float3 (0,0,0);
waveMove.x = dot (s, _waveXmove);
waveMove.z = dot (s, _waveZmove);
v.vertex.xz -= mul ((float3x3)_World2Object, waveMove).xz;
}
void surf (Input IN, inout SurfaceOutput o) {
fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
o.Albedo = c.rgb;
o.Emission = c.rgb * tex2D(_Illum, IN.uv_Illum).a;
o.Alpha = c.a;
}
ENDCG
}
Fallback "Transparent/Cutout/VertexLit"
}
