異世界宝探し
https://gyazo.com/f79bb990f89f21018f7b4c9b3ba6af16
パーリンノイズで擬似マイクラマップ
シェーダのモデル変換で、各頂点のローカル座標からワールド座標への変換がなされる事が判明したので、各頂点のワールド座標をパーリンノイズ に食わせて、山の高さを得る仕掛けを作った。
山の高低で色付け
各ボクセルはジオメトリシェーダによるもの。グリッド状の板ポリを用意して、各頂点のある場所にボクセルを生成した。
ライティングを自力でやる必要があって、意味不明すぎて苦労したし、いまだによく分ってない・・・
参考：
ライティングを考慮したシェーダ
Vertex/Fragment shaderで通常のライティングとシャドウを適用するサンプル
seedの違うパーリンノイズ も混ぜており、閾値以上であればセルの色を黄色くしている。これをお宝と称してる
最初期に悩んだのは、ボクセルの高低を滑らかにするか、よりマイクラっぽく1セル毎にするか。
見た目滑らかな方が個人的には良く見えたので、滑らかにしてみたけど、だったらボクセルにしない方がより良いかもしれない。
ジオメトリシェーダでボクセル表現を頑張ったけど、普通にグリッド状のポリゴンの高さを変えるだけでも、SFにありそうな地図っぽいものが描けて良いかも
こういうやつ
https://jumbleat.com/wp-content/uploads/2017/01/e_catch_tron_grid0000-825x510.png
シェーダの配置も少し悩んだ。
イメージ的には絵画の額縁から浮いて見える感じなのだけど、側面から見た時にスカスカなのはちょっと見苦しい
試しにソース貼ってみる
ソースコード：https://github.com/javel555/AltreasureShader
code:Altreasure.shader
Shader "Lit/Altreasure"
{
Properties
{
// _MainTex ("Texture", 2D) = "white" {}
_Scale("CellScale", float) = 1.0
_Freq("MapScale", float) = 1.0
_Height("MaxHeight", float) = 1.0
}
SubShader
{
Pass
{
Tags { "LightMode"="ForwardBase"}
// Cull Off
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma geometry geom
#include "UnityCG.cginc"
#include "Lighting.cginc"
#include "PerlinLib.cginc"
struct appdata
{
float4 vertex : POSITION;
float3 normal : NORMAL;
float2 uv : TEXCOORD0;
};
struct v2g
{
float4 vertex : POSITION;
float3 normal : NORMAL;
float2 uv : TEXCOORD0;
};
struct g2f
{
float4 vertex : SV_POSITION;
float2 uv : TEXCOORD0;
// float3 worldNormal : NORMAL;
float light: TEXCOORD1;
float noise: TEXCOORD2;
float noise2: TEXCOORD3;
};
float _Scale;
float _Freq;
float _Height;
// sampler2D _MainTex;
// float4 _MainTex_ST;
void vert (in appdata v, out v2g o)
{
// o.vertex = UnityObjectToClipPos(v.vertex);
// o.worldNormal = UnityObjectToWorldNormal(v.normal);
// // o.uv = TRANSFORM_TEX(v.uv, _MainTex);
// o.uv = v.uv;
o.vertex = v.vertex;
o.normal = v.normal;
o.uv = v.uv;
}
maxvertexcount(24)
void geom(point v2g input1, inout TriangleStream<g2f> outStream)
{
// base
float4 world_pos = mul(UNITY_MATRIX_M, input0.vertex); // 世界原点とした座標
float4 view_pos = mul(UNITY_MATRIX_V, world_pos); // カメラ原点とした座標
float4 org = input0.vertex;
float dist = _Scale;
float non = 0.0;
// noise
float2 xz = world_pos.xz * _Freq;
// xz = floor(xz * 2)/2;
float n = cnoise(float3(xz,0));
float h = (n * 0.5 + 0.5);
// h = floor(h*6) / 6;
org.y += h * _Height;
// create cube
float4 v0 = float4(-dist,dist,-dist,non) + org;
float4 v1 = float4(dist,dist,-dist,non) + org;
float4 v2 = float4(-dist,-dist,-dist,non) + org;
float4 v3 = float4(dist,-dist,-dist,non) + org;
float4 v4 = float4(dist,dist,-dist,non) + org;
float4 v5 = float4(dist,-dist,dist,non) + org;
float4 v6 = float4(dist,dist,dist,non) + org;
float4 v7 = float4(-dist,dist,dist,non) +org;
float4 v8 = float4(dist,-dist,dist,non) +org;
float4 v9 = float4(-dist,-dist,dist,non) +org;
float4 v10 = float4(-dist,dist,dist,non)+org;
float4 v11 = float4(-dist,-dist,-dist,non)+org;
float4 v12 = float4(-dist,dist,-dist,non)+org;
v0 = mul(UNITY_MATRIX_M, v0);
v1 = mul(UNITY_MATRIX_M, v1);
v2 = mul(UNITY_MATRIX_M, v2);
v3 = mul(UNITY_MATRIX_M, v3);
v4 = mul(UNITY_MATRIX_M, v4);
v5 = mul(UNITY_MATRIX_M, v5);
v6 = mul(UNITY_MATRIX_M, v6);
v7 = mul(UNITY_MATRIX_M, v7);
v8 = mul(UNITY_MATRIX_M, v8);
v9 = mul(UNITY_MATRIX_M, v9);
v10 = mul(UNITY_MATRIX_M, v10);
v11 = mul(UNITY_MATRIX_M, v11);
v12 = mul(UNITY_MATRIX_M, v12);
g2f o;
o.uv = input0.uv;
o.noise = n;
o.noise2 = cnoise(float3(xz,1));
// o.worldNormal = UnityObjectToWorldNormal(input0.normal);
float3 vecA = v1 - v0;
float3 vecB = v2 - v0;
float3 normal = cross(vecA, vecB);
normal = normalize(mul(normal, (float3x3) unity_WorldToObject));
float3 lightDir = normalize(_WorldSpaceLightPos0.xyz);
o.light = max(0., dot(normal, lightDir));
o.vertex = mul(UNITY_MATRIX_VP,v0);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v1);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v2);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v3);
outStream.Append(o);
outStream.RestartStrip();
vecA = v4 - v3;
vecB = v5 - v3;
normal = cross(vecA, vecB);
normal = normalize(mul(normal, (float3x3) unity_WorldToObject));
lightDir = normalize(_WorldSpaceLightPos0.xyz);
o.light = max(0., dot(normal, lightDir));
o.vertex = mul(UNITY_MATRIX_VP,v3);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v4);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v5);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v6);
outStream.Append(o);
outStream.RestartStrip();
vecA = v7 - v6;
vecB = v8 - v6;
normal = cross(vecA, vecB);
normal = normalize(mul(normal, (float3x3) unity_WorldToObject));
lightDir = normalize(_WorldSpaceLightPos0.xyz);
o.light = max(0., dot(normal, lightDir));
o.vertex = mul(UNITY_MATRIX_VP,v6);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v7);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v8);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v9);
outStream.Append(o);
outStream.RestartStrip();
vecA = v10 - v9;
vecB = v11 - v9;
normal = cross(vecA, vecB);
normal = normalize(mul(normal, (float3x3) unity_WorldToObject));
lightDir = normalize(_WorldSpaceLightPos0.xyz);
o.light = max(0., dot(normal, lightDir));
o.vertex = mul(UNITY_MATRIX_VP,v9);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v10);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v11);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v12);
outStream.Append(o);
outStream.RestartStrip();
vecA = v0 - v1;
vecB = v6 - v1;
normal = cross(vecA, vecB);
normal = normalize(mul(normal, (float3x3) unity_WorldToObject));
lightDir = normalize(_WorldSpaceLightPos0.xyz);
o.light = max(0., dot(normal, lightDir));
o.vertex = mul(UNITY_MATRIX_VP,v1);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v0);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v6);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v7);
outStream.Append(o);
outStream.RestartStrip();
vecA = v3 - v2;
vecB = v9 - v2;
normal = cross(vecA, vecB);
normal = normalize(mul(normal, (float3x3) unity_WorldToObject));
lightDir = normalize(_WorldSpaceLightPos0.xyz);
o.light = max(0., dot(normal, lightDir));
o.vertex = mul(UNITY_MATRIX_VP,v2);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v3);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v9);
outStream.Append(o);
o.vertex = mul(UNITY_MATRIX_VP,v8);
outStream.Append(o);
outStream.RestartStrip();
}
void frag (in g2f i, out fixed4 col : SV_Target)
{
float n = i.noise * 0.5 + 0.5;
fixed4 baseColor = fixed4(0.2, 0.7, 0.2, 1.0);
if(n < 0.3){
baseColor = fixed4(0.2,0.2,0.7,1.0);
}
if(n > 0.7){
baseColor = fixed4(0.8,0.5,0.2,1.0);
}
float m = i.noise2 * 0.5 + 0.5;
if(m > 0.9){
baseColor = fixed4(1.0,1.0,0.1,1.0);
}
// float3 lightDir = _WorldSpaceLightPos0.xyz;
// float3 normal = normalize(i.worldNormal);
// float NL = dot(normal, lightDir);
// float3 lightColor = _LightColor0;
// col = fixed4(baseColor * lightColor * max(NL, 0), 0);
// col = fixed4(baseColor, 1.0);
i.light += 0.05;
col = i.light * baseColor;
}
ENDCG
}
}
}