我是继山姆朗斯基又名做一个教程。 零点（世界由零世界教程 ），他码的几何着色器的点云草发生器。 伟大的教程，但我想知道（并没有发现的研究天后妥善的解决办法），我怎么能实现阴影着色器（铸造和接收阴影）。 我试图深入挖掘着色器，但这是高，我的水平还没有。
我的问题是：我怎么能实现阴影投射到接收到这种草着色器？ 存在和正常工作到目前为止的代码如下：
Shader "Custom/GrassGeometryShader" {
// https://www.youtube.com/watch?v=HY6qFbmbij8 und http://www.battlemaze.com/?p=153
Properties {
// --> HDR allows High Dynamic Colors
[HDR]_BackgroundColor ("Background Color", Color) = (1,0,0,1) // default to red
[HDR]_ForegroundColor ("Foreground Color", Color) = (0,1,0,1) // default to green
_MainTex ("Albedo (RGB)", 2D) = "white" {}
_Glossiness ("Smoothness", Range(0,1)) = 0.5
_Metallic ("Metallic", Range(0,1)) = 0.0
_Cutoff("Alpha Cuttoff", Range (0,1)) = 0.15 // Wieviel abgeschnitten sien soll
_GrassHeight("GrasHeight", Float) = 0.25
_GrassWidt("GrasWidth", Float) = 0.25
_WindSpeed ("WindSpeed", Float) = 100
_WindStrength("WindStrength", Float) = 0.05
}
SubShader {
Tags { "RenderType"="Opaque" }
LOD 200
Pass
{
Cull OFF
CGPROGRAM
#include "UnityCG.cginc" // like: "using" in C#
// Vertex-Shader with vert-function
#pragma vertex vert
// Fragment-Shader with frag-function
#pragma fragment frag
// Geometry-Shader with geom-function
#pragma geometry geom
// Use shader model 3.0 target, to get nicer looking lighting
#pragma target 4.0 // needs to be 4.0 !
sampler2D _MainTex;
// vertex to graphics (v2g)
struct v2g
{
float4 pos : SV_POSITION;
float3 norm : NORMAL;
float2 uv : TEXCOORD0;
float3 color : TEXCOORD1;
};
//graphics to fragments (g2f)
struct g2f
{
float4 pos : SV_POSITION;
float3 norm : NORMAL;
float2 uv : TEXCOORD0;
float3 diffuseColor : TEXCOORD1;
//float3 specularColor : TEXCOORD2;
};
half _Glossiness;
half _Metallic;
fixed4 _BackgroundColor;
fixed4 _ForegroundColor;
half _GrassHeight;
half _GrassWidth;
half _Cutoff;
half _WindStrength;
half _WindSpeed;
// Vertex-Shader from Battlemaze.com
v2g vert(appdata_full v)
{
float3 v0 = mul(unity_ObjectToWorld, v.vertex).xyz;
v2g OUT;
OUT.pos = v.vertex;
OUT.norm = v.normal;
OUT.uv = v.texcoord;
OUT.color = tex2Dlod(_MainTex, v.texcoord).rgb;
return OUT;
}
void buldQuad(inout TriangleStream<g2f> triStream, float3 points[4], float3 color) {
g2f OUT;
float3 faceNormal = cross(points[1]-points[0], points[2]-points[0]);
for(int i; i < 4; ++i) {
OUT.pos = UnityObjectToClipPos(points[i]);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(i%2, (int)i/2);
triStream.Append(OUT);
}
triStream.RestartStrip();
}
// geom-Funktion
[maxvertexcount(24)]
void geom(point v2g IN[1], inout TriangleStream<g2f> triStream)
{
float3 lightPosition = _WorldSpaceLightPos0;
float3 perpendicularAngle = float3(0,0,1);
float3 faceNormal = cross(perpendicularAngle, IN[0].norm); // normal of gras
float3 v0 = IN[0].pos.xyz; // Tip of the gras
float3 v1 = IN[0].pos.xyz + IN[0].norm * _GrassHeight; // base of the gras
float3 v2 = IN[0].pos.xyz + IN[0].norm * _GrassHeight / 2; // middle part (?)
float3 wind = float3(sin(_Time.x * _WindSpeed + v0.x) + sin(_Time.x * _WindSpeed + v0.z * 2), 0, cos(_Time.x * _WindSpeed + v0.x * 2) + cos(_Time.x * _WindSpeed + v0.z)); // Anzahl oder Stärke der Manipulation an den Eckpunkten
// (_Time.x + v0.x + v0.z looks "random", because it's using time + coordinates)
v1 += wind * _WindStrength;
v2 += (wind * _WindStrength/2)/2;
float3 color = (IN[0].color); // color of the gras
float sin30 = 0.5;
float sin60 = 0.866f;
float cos30 = sin60;
float cos60 = sin30;
g2f OUT;
// Quad 1 - the following code could fit in one function (BUT!) it did not work on MacOSX, that's why it's still calculated the long way
OUT.pos = UnityObjectToClipPos(v0 + perpendicularAngle * 0.5 * _GrassHeight);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(1, 0);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v1 + perpendicularAngle * 0.5 * _GrassHeight);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(1, 1);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v0);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0.5, 0);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v1);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0.5, 1);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v1 - perpendicularAngle * 0.5 * _GrassHeight);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0, 1);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v0 - perpendicularAngle * 0.5 * _GrassHeight);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0, 0);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v0);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0.5, 0);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v1);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0.5, 1);
triStream.Append(OUT);
// Quad 2
OUT.pos = UnityObjectToClipPos(v0 + float3(sin60, 0, -cos60) * 0.5 * _GrassHeight);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(1, 0);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v1 + float3(sin60, 0, -cos60)* 0.5 * _GrassHeight);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(1, 1);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v0);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0.5, 0);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v1);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0.5, 1);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v0 - float3(sin60, 0, -cos60) * 0.5 * _GrassHeight);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0, 0);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v1 - float3(sin60, 0, -cos60) * 0.5 * _GrassHeight);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0, 1);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v0);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0.5, 0);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v1);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0.5, 1);
triStream.Append(OUT);
// Quad 3 - Positive
OUT.pos = UnityObjectToClipPos(v0 + float3(sin60, 0, cos60) * 0.5 * _GrassHeight);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(1, 0);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v1 + float3(sin60, 0, cos60)* 0.5 * _GrassHeight);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(1, 1);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v0);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0.5, 0);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v1);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0.5, 1);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v0 - float3(sin60, 0, cos60) * 0.5 * _GrassHeight);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0, 0);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v1 - float3(sin60, 0, cos60) * 0.5 * _GrassHeight);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0, 1);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v0);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0.5, 0);
triStream.Append(OUT);
OUT.pos = UnityObjectToClipPos(v1);
OUT.norm = faceNormal;
OUT.diffuseColor = color;
OUT.uv = float2(0.5, 1);
triStream.Append(OUT);
}
// Fragment-Shader by Battlemaze.com --> gets input v2g and renders it on screen
half4 frag(g2f IN) : COLOR
{
fixed4 c = tex2D(_MainTex, IN.uv);
clip(c.a - _Cutoff);
return c;
//return float4 (IN.diffuseColor.rgb, 1.0);
}
ENDCG
}
}
}
正如我所提到我有一台机器运行的不遗憾的是没有与计算着色器运行MacOS的工作。
我希望有这方面的帮助。
