im not a shader artist myself but im looking ways to convert this piece of code into nodes so that i could also add other stuff into the shader..
i got the shader off this unity forum link: https://forum.unity.com/threads/interio ... st-2751518
thanks, & it would be great if someone help me create the shader nodes & share it with the rest of the world
ther refs: https://simonschreibt.de/gat/windows-ac-row-ininite/
- Code: Select all
Shader "Custom/InteriorMapping - Cubemap"
{
Properties
{
_RoomCube ("Room Cube Map", Cube) = "white" {}
[Toggle(_USEOBJECTSPACE)] _UseObjectSpace ("Use Object Space", Float) = 0.0
}
SubShader
{
Tags { "RenderType"="Opaque" }
LOD 100
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma shader_feature _USEOBJECTSPACE
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
float3 normal : NORMAL;
float4 tangent : TANGENT;
};
struct v2f
{
float4 pos : SV_POSITION;
#ifdef _USEOBJECTSPACE
float3 uvw : TEXCOORD0;
#else
float2 uv : TEXCOORD0;
#endif
float3 viewDir : TEXCOORD1;
};
samplerCUBE _RoomCube;
float4 _RoomCube_ST;
// psuedo random
float3 rand3(float co){
return frac(sin(co * float3(12.9898,78.233,43.2316)) * 43758.5453);
}
v2f vert (appdata v)
{
v2f o;
o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
#ifdef _USEOBJECTSPACE
// slight scaling adjustment to work around "noisy wall" when frac() returns a 0 on surface
o.uvw = v.vertex * _RoomCube_ST.xyx * 0.999 + _RoomCube_ST.zwz;
// get object space camera vector
float4 objCam = mul(unity_WorldToObject, float4(_WorldSpaceCameraPos, 1.0));
o.viewDir = v.vertex.xyz - objCam.xyz;
// adjust for tiling
o.viewDir *= _RoomCube_ST.xyx;
#else
// uvs
o.uv = TRANSFORM_TEX(v.uv, _RoomCube);
// get tangent space camera vector
float4 objCam = mul(unity_WorldToObject, float4(_WorldSpaceCameraPos, 1.0));
float3 viewDir = v.vertex.xyz - objCam.xyz;
float tangentSign = v.tangent.w * unity_WorldTransformParams.w;
float3 bitangent = cross(v.normal.xyz, v.tangent.xyz) * tangentSign;
o.viewDir = float3(
dot(viewDir, v.tangent.xyz),
dot(viewDir, bitangent),
dot(viewDir, v.normal)
);
// adjust for tiling
o.viewDir *= _RoomCube_ST.xyx;
#endif
return o;
}
fixed4 frag (v2f i) : SV_Target
{
#ifdef _USEOBJECTSPACE
// room uvws
float3 roomUVW = frac(i.uvw);
// raytrace box from object view dir
float3 pos = roomUVW * 2.0 - 1.0;
float3 id = 1.0 / i.viewDir;
float3 k = abs(id) - pos * id;
float kMin = min(min(k.x, k.y), k.z);
pos += kMin * i.viewDir;
// randomly flip & rotate cube map for some variety
float3 flooredUV = floor(i.uvw);
float3 r = rand3(flooredUV.x + flooredUV.y + flooredUV.z);
float2 cubeflip = floor(r.xy * 2.0) * 2.0 - 1.0;
pos.xz *= cubeflip;
pos.xz = r.z > 0.5 ? pos.xz : pos.zx;
#else
// room uvs
float2 roomUV = frac(i.uv);
// raytrace box from tangent view dir
float3 pos = float3(roomUV * 2.0 - 1.0, 1.0);
float3 id = 1.0 / i.viewDir;
float3 k = abs(id) - pos * id;
float kMin = min(min(k.x, k.y), k.z);
pos += kMin * i.viewDir;
// randomly flip & rotate cube map for some variety
float2 flooredUV = floor(i.uv);
float3 r = rand3(flooredUV.x + 1.0 + flooredUV.y * (flooredUV.x + 1));
float2 cubeflip = floor(r.xy * 2.0) * 2.0 - 1.0;
pos.xz *= cubeflip;
pos.xz = r.z > 0.5 ? pos.xz : pos.zx;
#endif
// sample room cube map
fixed4 room = texCUBE(_RoomCube, pos.xyz);
return fixed4(room.rgb, 1.0);
}
ENDCG
}
}
}
