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partybusiness/DrawLine.shader

Last active September 23, 2020 04:43
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Line rendering shaders
Raw
DrawLine.shader
Shader "Unlit/DrawLine"
{
Properties
{
_Color("Line Colour", Color) = (0.5,0.5,0.5,1)
_Width ("Line Width", float) = 2.0
_FadeWidth("Fade Width", float) = 0.1
}
SubShader
{
Tags{
"RenderType" = "Transparent"
"Queue" = "Transparent"
}
LOD 100
Blend SrcAlpha OneMinusSrcAlpha
ZWrite off
Cull Off
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
};
struct v2f
{
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
};
float4 _Color;
float _Width;
float _FadeWidth;
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = v.uv;
return o;
}
fixed pythagWidth(float p) {
return sqrt(pow(ddy(p),2) + pow(ddx(p),2));
}
fixed fuzzEdges(float val, float maxWidth, float minWidth) {
//val<width;;//
return smoothstep(maxWidth, minWidth, val);
}
fixed4 frag (v2f i) : SV_Target
{
fixed lineWidth = pythagWidth(i.uv.y);
fixed minWidth = _Width-_FadeWidth;
fixed alpha = smoothstep(0, lineWidth, lineWidth - abs(i.uv.y - 0.5));
alpha = fuzzEdges (abs(i.uv.y - 0.5), lineWidth*_Width, lineWidth*minWidth);
return fixed4(_Color.rgb, _Color.a*alpha);
}
ENDCG
}
}
}
Raw
LaserGrid.shader
Shader "Unlit/LaserGrid"
{
Properties
{
_Color("Line Colour", Color) = (0.5,0.5,0.5,1)
_Width ("Line Width", float) = 2.0
_Freq("Line Frequency", float) = 1.0
}
SubShader
{
Tags{
"RenderType" = "Transparent"
"Queue" = "Transparent"
}
LOD 100
Blend SrcAlpha OneMinusSrcAlpha
ZWrite off
Cull Off
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
};
struct v2f
{
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
};
float4 _Color;
float _Width;
float _Freq;
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = v.uv * _Freq;
return o;
}
fixed4 frag (v2f i) : SV_Target
{
fixed2 newUv = abs(i.uv % 1.0);
fixed lineWidthY = fwidth(i.uv.y) * _Width;
fixed alphaY = smoothstep(0, lineWidthY, lineWidthY - abs(newUv.y - 0.5));
fixed lineWidthX = fwidth(i.uv.x) * _Width;
fixed alphaX = smoothstep(0, lineWidthX, lineWidthX - abs(newUv.x - 0.5));
return fixed4(_Color.rgb, _Color.a*max(alphaX,alphaY));
}
ENDCG
}
}
}
Raw
SkyboxLaserGrid.shader
Shader "Skybox/SkyboxLaserGrid"
{
Properties
{
_Color("Line Colour", Color) = (0.5,0.5,0.5,1)
_BackColor("Background Colour", Color) = (0.5,0.5,0.5,1)
_Width ("Line Width", float) = 2.0
_Spacing("Line Spacing", float) = 1.0
_GridOffset("Grid Offset", Vector) = (0.0,1.0,0.0,2.0)
//w defines space from centre of offset to floor
}
SubShader
{
Tags{ "Queue" = "Background" "RenderType" = "Background" "PreviewType" = "Skybox" }
ZWrite Off
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
};
struct v2f
{
float4 vertex : SV_POSITION;
float4 wp : TEXCOORD0;
float3 viewDir : TEXCOORD1;
};
float4 _Color;
float _Width;
float _Spacing;
float4 _BackColor;
float4 _GridOffset;
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.wp = mul(unity_ObjectToWorld, v.vertex);
o.viewDir = o.wp.xyz - _WorldSpaceCameraPos;
//o.uv = v.uv * _Freq;
return o;
}
fixed2 UVsForFloor(fixed3 viewDir, fixed4 wp) {
//Fine if you only need floor
/*
float3 oc = normalize(viewDir);
float t = (_GridOffset.y - _WorldSpaceCameraPos.y - _GridOffset.w) / oc.y;
fixed3 foundPoint = _WorldSpaceCameraPos + oc * t;
return (foundPoint.xz - _GridOffset.xz) / _Spacing;
// */
// This also handles ceiling
// /*
float3 oc = normalize(viewDir);
float t = (_GridOffset.y - _WorldSpaceCameraPos.y + lerp (-_GridOffset.w, _GridOffset.w, sign(oc.y)*0.5+0.5) ) / oc.y;
fixed3 foundPoint = _WorldSpaceCameraPos + oc * t;
return (foundPoint.xz - _GridOffset.xz) / _Spacing;
// */
}
fixed4 frag (v2f i) : SV_Target
{
fixed2 uv = UVsForFloor(i.viewDir, i.wp);
fixed2 newUv = abs(uv % 1.0);
fixed lineWidthY = fwidth(uv.y) * _Width;
fixed alphaY = smoothstep(0, lineWidthY, lineWidthY - abs(newUv.y - 0.5));
fixed lineWidthX = fwidth(uv.x) * _Width;
fixed alphaX = smoothstep(0, lineWidthX, lineWidthX - abs(newUv.x - 0.5));
//version that shows only floor grid and fades above horizon to _BackColor
//return fixed4(lerp(_BackColor.rgb,_Color.rgb, _Color.a*max(alphaX, alphaY)*clamp( (-normalize(i.viewDir).y*50) , 0 , 1 )), 1);
//version that shows top and bottom grid but covers horizon in solid colour to avoid one-pixel glitch
return fixed4(lerp(_BackColor.rgb, _Color.rgb, _Color.a*max(max(alphaX, alphaY), 1-abs(normalize(i.viewDir).y*50))), 1);
}
ENDCG
}
}
}
Raw
WireCube.obj
# Blender v2.80 (sub 75) OBJ File: 'wireCube.blend'
# www.blender.org
# This cube works with the DrawLine.shader
o WireCube_Cube
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