So, I'm using a shader along with a c# script to instantiate grass meshes in my scene. The C# script provides the positions where the grass should be created at and passes it to the positions buffer in my shader. That's all working well enough, but I want to add simple wind simulation to the grass, but I don't know how to do it. Any help would mean so much. Here is my shader:
Shader "Unlit/Grass"
{
Properties
{
_MainTex ("Albedo (RGB)", 2D) = "white" {}
_Albedo1 ("Albedo 1", Color) = (1, 1, 1)
_Albedo2 ("Albedo 2", Color) = (1, 1, 1)
_AOColor ("Ambient Occlusion", Color) = (1, 1, 1)
_TipColor ("Tip Color", Color) = (1, 1, 1)
_Scale ("Scale", Range(0.0, 2.0)) = 0.0
}
SubShader
{
Tags { "RenderType"="Opaque" }
LOD 100
Cull Off
HLSLINCLUDE
#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"
CBUFFER_START(UnityPerMaterial)
float4 _Albedo1, _Albedo2, _AOColor, _TipColor, _WorldSize;
float _Scale;
CBUFFER_END
StructuredBuffer positionBuffer;
struct VertexInput {
float4 position : POSITION;
float2 uv : TEXCOORD0;
};
struct VertexOutput {
float4 position : SV_POSITION;
float2 uv : TEXCOORD0;
};
ENDHLSL
Pass
{
HLSLPROGRAM
#pragma vertex vert
#pragma fragment frag
VertexOutput vert(VertexInput i, uint instanceID : SV_InstanceID)
{
float3 data = positionBuffer[instanceID];
float3 localPosition = i.position.xyz;
float3 worldPosition = data.xyz + localPosition;
VertexOutput o;
o.position = mul(UNITY_MATRIX_VP, float4(worldPosition, 1.0f));
o.uv = i.uv;
return o;
}
float4 frag(VertexOutput i) : SV_Target
{
float4 col = lerp(_Albedo1, _Albedo2, i.uv.y);
float4 ao = lerp(_AOColor, 1.0f, i.uv.y);
float4 tip = lerp(0.0f, _TipColor, i.uv.y * i.uv.y * (1.0f + _Scale));
return (col + tip) * ao;
}
ENDHLSL
}
}
}
TIA!
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