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@yagiri000

ジオメトリシェーダー基本図形コード集

Last updated at Posted at 2019-10-16

ShaderLabのジオメトリシェーダで以下のような形状を生成するベタ書きコード集です。

GeomPrim.gif

正四面体

Shader "Yagiri/GeometryShader/Primitive/Tetrahedron"
{

Properties
{
}
SubShader
{

Tags { "RenderType"="Opaque" }
LOD 100

Pass
{
CGPROGRAM
#pragma vertex vert
#pragma geometry geom
#pragma fragment frag
#include "UnityCG.cginc"
#define PI2 6.28318530718

struct appdata
{
    float4 vertex : POSITION;
};

struct v2g
{
    float4 pos : POSITION;
};

struct g2f
{
    float4 pos : SV_POSITION;
    float3 normal : NORMAL;
};

v2g vert(appdata v)
{
    v2g o;
    o.pos = v.vertex;
    return o;
}


static const float3 vertexs[12] = 
{
float3(0.0, 0.5, 0.0),
float3(0.235703, -0.166665, 0.408249),
float3(0.235703, -0.166665, -0.408249),
float3(0.0, 0.5, 0.0),
float3(0.235703, -0.166665, -0.408249),
float3(-0.471405, -0.166665, 0.0),
float3(0.0, 0.5, 0.0),
float3(-0.471405, -0.166665, 0.0),
float3(0.235703, -0.166665, 0.408249),
float3(-0.471405, -0.166665, 0.0),
float3(0.235703, -0.166665, -0.408249),
float3(0.235703, -0.166665, 0.408249)
};

static const float3 normals[4] = 
{
float3(0.942809,0.333335,-0.0),
float3(-0.471404,0.333335,-0.816496),
float3(-0.471404,0.333335,0.816496),
float3(0.0,-1.0,0.0)
};

[maxvertexcount(12)]
void geom(point v2g input[1], uint id : SV_PrimitiveID, inout TriangleStream<g2f> outStream)
{
    g2f o;

    [unroll]
    for(int j = 0; j < 4; j++)
    {
        [unroll]
        for (int k = 0; k < 3; k++)
        {
            const int vid = j * 3 + k;
            o.pos = float4(vertexs[vid], 1.0);
            o.pos = UnityObjectToClipPos(o.pos);
            o.normal = UnityObjectToWorldNormal(normals[j]);
            outStream.Append(o);
        }
        outStream.RestartStrip();
    }
}

fixed4 frag(g2f i) : SV_Target
{
    float4 col = 1;
    float3 lightdir = _WorldSpaceLightPos0.xyz;
    col.xyz *= saturate(dot(i.normal, -lightdir));
    return col;
}
ENDCG
}
}
}

立方体

Shader "Yagiri/GeometryShader/Primitive/Cube"
{

Properties
{
}
SubShader
{

Tags { "RenderType"="Opaque" }
LOD 100

Pass
{
CGPROGRAM
#pragma vertex vert
#pragma geometry geom
#pragma fragment frag
#include "UnityCG.cginc"
#define PI2 6.28318530718

// vertex shaderに入る構造体
struct appdata
{
    float4 vertex : POSITION;
};

// vertex shader から geometry shaderに渡る構造体
struct v2g{
    float4 pos : POSITION;
};

// geometry shaderからfragment shaderに渡る構造体
struct g2f
{
    float4 pos : SV_POSITION;
    float3 normal : NORMAL;
};

v2g vert(appdata v)
{
    v2g o;
    o.pos = v.vertex;
    return o;
}

static const float3 vertexs[24] = {
float3(0.5, -0.5, 0.5),
float3(0.5, 0.5, 0.5),
float3(-0.5, -0.5, 0.5),
float3(-0.5, 0.5, 0.5),
float3(-0.5, -0.5, -0.5),
float3(-0.5, 0.5, -0.5),
float3(0.5, -0.5, -0.5),
float3(0.5, 0.5, -0.5),
float3(-0.5, 0.5, -0.5),
float3(-0.5, 0.5, 0.5),
float3(0.5, 0.5, -0.5),
float3(0.5, 0.5, 0.5),
float3(0.5, -0.5, -0.5),
float3(0.5, -0.5, 0.5),
float3(-0.5, -0.5, -0.5),
float3(-0.5, -0.5, 0.5),
float3(0.5, -0.5, -0.5),
float3(0.5, 0.5, -0.5),
float3(0.5, -0.5, 0.5),
float3(0.5, 0.5, 0.5),
float3(-0.5, -0.5, 0.5),
float3(-0.5, 0.5, 0.5),
float3(-0.5, -0.5, -0.5),
float3(-0.5, 0.5, -0.5)
};

static const float3 normals[6] = 
{
float3(0.0,0.0,1.0),
float3(0.0,0.0,-1.0),
float3(0.0,1.0,0.0),
float3(0.0,-1.0,0.0),
float3(1.0,0.0,0.0),
float3(-1.0,0.0,0.0)
};

[maxvertexcount(24)]
void geom(point v2g input[1], uint id : SV_PrimitiveID, inout TriangleStream<g2f> outStream)
{
    g2f o;

    [unroll]
    for(int j = 0; j < 6; j++)
    {
        [unroll]
        for (int k = 0; k < 4; k++)
        {
            const int vid = j * 4 + k;
            o.pos = float4(vertexs[vid], 1.0);
            o.pos = UnityObjectToClipPos(o.pos);
            o.normal = UnityObjectToWorldNormal(normals[j]);
            outStream.Append(o);
        }
        outStream.RestartStrip();
    }
}

fixed4 frag(g2f i) : SV_Target
{
    float4 col = 1;
    float3 lightdir = _WorldSpaceLightPos0.xyz;
    col.xyz *= saturate(dot(i.normal, -lightdir));
    return col;
}
ENDCG
}
}
}

正八面体

Shader "Yagiri/GeometryShader/Primitive/Octahedron"
{

Properties
{
}
SubShader
{

Tags { "RenderType"="Opaque" }
LOD 100

Pass
{
CGPROGRAM
#pragma vertex vert
#pragma geometry geom
#pragma fragment frag
#include "UnityCG.cginc"
#define PI2 6.28318530718

// vertex shaderに入る構造体
struct appdata
{
    float4 vertex : POSITION;
};

// vertex shader から geometry shaderに渡る構造体
struct v2g{
    float4 pos : POSITION;
};

// geometry shaderからfragment shaderに渡る構造体
struct g2f
{
    float4 pos : SV_POSITION;
    float3 normal : NORMAL;
};

v2g vert(appdata v)
{
    v2g o;
    o.pos = v.vertex;
    return o;
}

static const float3 vertexs[24] = 
{
float3(0.0, 0.0, -0.5),
float3(0.0, -0.5, 0.0),
float3(-0.5, 0.0, 0.0),
float3(0.0, 0.0, -0.5),
float3(0.5, 0.0, 0.0),
float3(0.0, -0.5, 0.0),
float3(0.5, 0.0, 0.0),
float3(0.0, 0.0, 0.5),
float3(0.0, -0.5, 0.0),
float3(0.0, 0.0, 0.5),
float3(-0.5, 0.0, 0.0),
float3(0.0, -0.5, 0.0),
float3(0.0, 0.0, -0.5),
float3(-0.5, 0.0, 0.0),
float3(0.0, 0.5, 0.0),
float3(0.0, 0.0, -0.5),
float3(0.0, 0.5, 0.0),
float3(0.5, 0.0, 0.0),
float3(0.5, 0.0, 0.0),
float3(0.0, 0.5, 0.0),
float3(0.0, 0.0, 0.5),
float3(0.0, 0.0, 0.5),
float3(0.0, 0.5, 0.0),
float3(-0.5, 0.0, 0.0)
};

static const float3 normals[8] = 
{
float3(-0.57735,-0.57735,-0.57735),
float3(0.57735,-0.57735,-0.57735),
float3(0.57735,-0.57735,0.57735),
float3(-0.57735,-0.57735,0.57735),
float3(-0.57735,0.57735,-0.57735),
float3(0.57735,0.57735,-0.57735),
float3(0.57735,0.57735,0.57735),
float3(-0.57735,0.57735,0.57735),
};

[maxvertexcount(24)]
void geom(point v2g input[1], uint id : SV_PrimitiveID, inout TriangleStream<g2f> outStream)
{
    g2f o;

    [unroll]
    for(int j = 0; j < 8; j++)
    {
        [unroll]
        for (int k = 0; k < 3; k++)
        {
            const int vid = j * 3 + k;
            o.pos = float4(vertexs[vid], 1.0);
            o.pos = UnityObjectToClipPos(o.pos);
            o.normal = UnityObjectToWorldNormal(normals[j]);
            outStream.Append(o);
        }
        outStream.RestartStrip();
    }
}

fixed4 frag(g2f i) : SV_Target
{
    float4 col = 1;
    float3 lightdir = _WorldSpaceLightPos0.xyz;
    col.xyz *= saturate(dot(i.normal, -lightdir));
    return col;
}
ENDCG
}
}
}

正二十面体

Shader "Yagiri/GeometryShader/Primitive/Icosahedron"
{

Properties
{
}
SubShader
{

Tags { "RenderType"="Opaque" }
LOD 100

Pass
{
CGPROGRAM
#pragma vertex vert
#pragma geometry geom
#pragma fragment frag
#include "UnityCG.cginc"
#define PI2 6.28318530718

// vertex shaderに入る構造体
struct appdata
{
    float4 vertex : POSITION;
};

// vertex shader から geometry shaderに渡る構造体
struct v2g{
    float4 pos : POSITION;
};

// geometry shaderからfragment shaderに渡る構造体
struct g2f
{
    float4 pos : SV_POSITION;
    float3 normal : NORMAL;
};

v2g vert(appdata v)
{
    v2g o;
    o.pos = v.vertex;
    return o;
}

static const float3 vertexs[60] = 
{
float3(0.425325, 0.138197, -0.223607),
float3(0.0, 0.0, -0.5),
float3(0.0, 0.447214, -0.223607),
float3(0.262866, -0.361803, -0.223607),
float3(0.0, 0.0, -0.5),
float3(0.425325, 0.138197, -0.223607),
float3(-0.262866, -0.361803, -0.223607),
float3(0.0, 0.0, -0.5),
float3(0.262866, -0.361803, -0.223607),
float3(-0.425325, 0.138197, -0.223607),
float3(0.0, 0.0, -0.5),
float3(-0.262866, -0.361803, -0.223607),
float3(0.0, 0.447214, -0.223607),
float3(0.0, 0.0, -0.5),
float3(-0.425325, 0.138197, -0.223607),
float3(-0.262866, 0.361803, 0.223607),
float3(0.0, 0.447214, -0.223607),
float3(-0.425325, 0.138197, -0.223607),
float3(-0.425325, -0.138197, 0.223607),
float3(-0.425325, 0.138197, -0.223607),
float3(-0.262866, -0.361803, -0.223607),
float3(0.0, -0.447214, 0.223607),
float3(-0.262866, -0.361803, -0.223607),
float3(0.262866, -0.361803, -0.223607),
float3(0.425325, -0.138197, 0.223607),
float3(0.262866, -0.361803, -0.223607),
float3(0.425325, 0.138197, -0.223607),
float3(0.262866, 0.361803, 0.223607),
float3(0.425325, 0.138197, -0.223607),
float3(0.0, 0.447214, -0.223607),
float3(0.262866, 0.361803, 0.223607),
float3(0.0, 0.447214, -0.223607),
float3(-0.262866, 0.361803, 0.223607),
float3(-0.262866, 0.361803, 0.223607),
float3(-0.425325, 0.138197, -0.223607),
float3(-0.425325, -0.138197, 0.223607),
float3(-0.425325, -0.138197, 0.223607),
float3(-0.262866, -0.361803, -0.223607),
float3(0.0, -0.447214, 0.223607),
float3(0.0, -0.447214, 0.223607),
float3(0.262866, -0.361803, -0.223607),
float3(0.425325, -0.138197, 0.223607),
float3(0.425325, -0.138197, 0.223607),
float3(0.425325, 0.138197, -0.223607),
float3(0.262866, 0.361803, 0.223607),
float3(-0.262866, 0.361803, 0.223607),
float3(0.0, 0.0, 0.5),
float3(0.262866, 0.361803, 0.223607),
float3(0.262866, 0.361803, 0.223607),
float3(0.0, 0.0, 0.5),
float3(0.425325, -0.138197, 0.223607),
float3(0.425325, -0.138197, 0.223607),
float3(0.0, 0.0, 0.5),
float3(0.0, -0.447214, 0.223607),
float3(0.0, -0.447214, 0.223607),
float3(0.0, 0.0, 0.5),
float3(-0.425325, -0.138197, 0.223607),
float3(-0.425325, -0.138197, 0.223607),
float3(0.0, 0.0, 0.5),
float3(-0.262866, 0.361803, 0.223607)
};

static const float3 normals[20] = 
{
float3(0.356822,0.491124,-0.794654),
float3(0.577351,-0.187592,-0.794654),
float3(0.0,-0.607062,-0.794654),
float3(-0.577351,-0.187592,-0.794654),
float3(-0.356822,0.491124,-0.794654),
float3(-0.57735,0.794655,-0.187593),
float3(-0.934172,-0.303531,-0.187593),
float3(-0.0,-0.982247,-0.187593),
float3(0.934172,-0.303531,-0.187593),
float3(0.57735,0.794655,-0.187593),
float3(0.0,0.982247,0.187593),
float3(-0.934172,0.303531,0.187593),
float3(-0.57735,-0.794655,0.187593),
float3(0.57735,-0.794655,0.187593),
float3(0.934172,0.303531,0.187593),
float3(-0.0,0.607062,0.794654),
float3(0.577351,0.187592,0.794654),
float3(0.356822,-0.491124,0.794654),
float3(-0.356822,-0.491124,0.794654),
float3(-0.577351,0.187592,0.794654),
};

[maxvertexcount(60)]
void geom(point v2g input[1], uint id : SV_PrimitiveID, inout TriangleStream<g2f> outStream)
{
    g2f o;

    [unroll]
    for(int j = 0; j < 20; j++)
    {
        [unroll]
        for (int k = 0; k < 3; k++)
        {
            const int vid = j * 3 + k;
            o.pos = float4(vertexs[vid], 1.0);
            o.pos = UnityObjectToClipPos(o.pos);
            o.normal = UnityObjectToWorldNormal(normals[j]);
            outStream.Append(o);
        }
        outStream.RestartStrip();
    }
}

fixed4 frag(g2f i) : SV_Target
{
    float4 col = 1;
    float3 lightdir = _WorldSpaceLightPos0.xyz;
    col.xyz *= saturate(dot(i.normal, -lightdir));
    return col;
}
ENDCG
}
}
}

リング, チューブ

Shader "Yagiri/GeometryShader/Primitive/RingAndTube"
{

Properties
{
_RadiusA("RadiusA", Float) = 0.5
_RadiusB("RadiusB", Float) = 0.3
_HeightA("HeightA", Float) = 0.0
_HeightB("HeightB", Float) = 0.0
}
SubShader
{

Tags { "RenderType"="Opaque" }
LOD 100
Cull Off

Pass
{
CGPROGRAM
#pragma vertex vert
#pragma geometry geom
#pragma fragment frag
#include "UnityCG.cginc"
#define PI2 6.28318530718

struct appdata
{
    float4 vertex : POSITION;
};

struct v2g
{
    float4 pos : POSITION;
};

struct g2f
{
    float4 pos : SV_POSITION;
    float3 normal : NORMAL;
};

v2g vert(appdata v)
{
    v2g o;
    o.pos = v.vertex;
    return o;
}

float _RadiusA;
float _RadiusB;
float _HeightA;
float _HeightB;

// ※最大頂点数制限に注意
// RowN * Column * 4 = 96
[maxvertexcount(96)]
void geom(point v2g input[1], uint id : SV_PrimitiveID, inout TriangleStream<g2f> outStream)
{
    g2f o;

    const int RowN = 3;
    const int ColumnN = 8;

    [unroll]
    for (int j = 0; j < ColumnN; j++)
    {
        float nj = j / (float)ColumnN;
        float nj_ = (j + 1) / (float)ColumnN;
        float3 top = float3(
            _RadiusA * cos(PI2*nj), 
            _HeightA, 
            _RadiusA * sin(PI2*nj)
            );
        float3 bottom = float3(
            _RadiusB * cos(PI2*nj), 
            _HeightB, 
            _RadiusB * sin(PI2*nj)
            );
        float3 top_ = float3(
            _RadiusA * cos(PI2*nj_), 
            _HeightA, 
            _RadiusA * sin(PI2*nj_)
            );
        float3 bottom_ = float3(
            _RadiusB * cos(PI2*nj_), 
            _HeightB, 
            _RadiusB * sin(PI2*nj_)
            );

        [unroll]
        for(int k = 0; k < RowN; k++)
        {
            float nk = k / (float)RowN;
            float nk_ = (k + 1) / (float)RowN;

            float3 p0 = lerp(top, bottom, nk);
            float3 p1 = lerp(top, bottom, nk_);
            float3 p2 = lerp(top_, bottom_, nk);
            float3 p3 = lerp(top_, bottom_, nk_);

            float3 n = normalize(cross(p1 - p0, p2 - p0));
            o.normal = UnityObjectToWorldNormal(n);

            o.pos = UnityObjectToClipPos(float4(p0, 1.0));
            outStream.Append(o);
            o.pos = UnityObjectToClipPos(float4(p1, 1.0));
            outStream.Append(o);
            o.pos = UnityObjectToClipPos(float4(p2, 1.0));
            outStream.Append(o);
            o.pos = UnityObjectToClipPos(float4(p3, 1.0));
            outStream.Append(o);

            outStream.RestartStrip();
        }
    }
}

fixed4 frag(g2f i) : SV_Target
{
    float4 col = 1;
    float3 lightdir = _WorldSpaceLightPos0.xyz;
    col.xyz *= saturate(dot(i.normal, -lightdir));
    return col;
}
ENDCG
}
}
}
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