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Shader "Tutorial/030_BakeTextures/Read3dTexture"
{
//show values to edit in inspector
Properties{
_Height("Height", Range(0, 1)) = 0
_Color ("Tint", Color) = (0, 0, 0, 1)
_MainTex ("Texture", 3D) = "white" {}
}
SubShader{
//the material is completely non-transparent and is rendered at the same time as the other opaque geometry
Tags{ "RenderType"="Opaque" "Queue"="Geometry"}
Pass{
CGPROGRAM
//include useful shader functions
#include "UnityCG.cginc"
//define vertex and fragment shader
#pragma vertex vert
#pragma fragment frag
//texture and transforms of the texture
sampler3D _MainTex;
float4 _MainTex_ST;
//tint of the texture
fixed4 _Color;
float _Height;
//the object data that's put into the vertex shader
struct appdata{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
};
//the data that's used to generate fragments and can be read by the fragment shader
struct v2f{
float4 position : SV_POSITION;
float2 uv : TEXCOORD0;
};
//the vertex shader
v2f vert(appdata v){
v2f o;
//convert the vertex positions from object space to clip space so they can be rendered
o.position = UnityObjectToClipPos(v.vertex);
o.uv = TRANSFORM_TEX(v.uv, _MainTex);
return o;
}
//the fragment shader
fixed4 frag(v2f i) : SV_TARGET{
fixed4 col = tex3D(_MainTex, float3(i.uv, _Height));
col *= _Color;
return col;
}
ENDCG
}
}
}