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Shader "Custom/Geometry/Wireframe"
{
Properties
{
[PowerSlider(3.0)]
_WireframeVal ("Wireframe width", Range(0., 0.5)) = 0.05
_FrontColor ("Front color", color) = (1., 1., 1., 1.)
_BackColor ("Back color", color) = (1., 1., 1., 1.)
[Toggle] _RemoveDiag("Remove diagonals?", Float) = 0.
}
SubShader
{
Tags { "Queue"="Geometry" "RenderType"="Opaque" }
Pass
{
Cull Front
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma geometry geom
// Change "shader_feature" with "pragma_compile" if you want set this keyword from c# code
#pragma shader_feature __ _REMOVEDIAG_ON
#include "UnityCG.cginc"
struct v2g {
float4 worldPos : SV_POSITION;
};
struct g2f {
float4 pos : SV_POSITION;
float3 bary : TEXCOORD0;
};
v2g vert(appdata_base v) {
v2g o;
o.worldPos = mul(unity_ObjectToWorld, v.vertex);
return o;
}
[maxvertexcount(3)]
void geom(triangle v2g IN[3], inout TriangleStream<g2f> triStream) {
float3 param = float3(0., 0., 0.);
#if _REMOVEDIAG_ON
float EdgeA = length(IN[0].worldPos - IN[1].worldPos);
float EdgeB = length(IN[1].worldPos - IN[2].worldPos);
float EdgeC = length(IN[2].worldPos - IN[0].worldPos);
if(EdgeA > EdgeB && EdgeA > EdgeC)
param.y = 1.;
else if (EdgeB > EdgeC && EdgeB > EdgeA)
param.x = 1.;
else
param.z = 1.;
#endif
g2f o;
o.pos = mul(UNITY_MATRIX_VP, IN[0].worldPos);
o.bary = float3(1., 0., 0.) + param;
triStream.Append(o);
o.pos = mul(UNITY_MATRIX_VP, IN[1].worldPos);
o.bary = float3(0., 0., 1.) + param;
triStream.Append(o);
o.pos = mul(UNITY_MATRIX_VP, IN[2].worldPos);
o.bary = float3(0., 1., 0.) + param;
triStream.Append(o);
}
float _WireframeVal;
fixed4 _BackColor;
fixed4 frag(g2f i) : SV_Target {
if(!any(bool3(i.bary.x < _WireframeVal, i.bary.y < _WireframeVal, i.bary.z < _WireframeVal)))
discard;
return _BackColor;
}
ENDCG
}
Pass
{
Cull Back
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma geometry geom
// Change "shader_feature" with "pragma_compile" if you want set this keyword from c# code
#pragma shader_feature __ _REMOVEDIAG_ON
#include "UnityCG.cginc"
struct v2g {
float4 worldPos : SV_POSITION;
};
struct g2f {
float4 pos : SV_POSITION;
float3 bary : TEXCOORD0;
};
v2g vert(appdata_base v) {
v2g o;
o.worldPos = mul(unity_ObjectToWorld, v.vertex);
return o;
}
[maxvertexcount(3)]
void geom(triangle v2g IN[3], inout TriangleStream<g2f> triStream) {
float3 param = float3(0., 0., 0.);
#if _REMOVEDIAG_ON
float EdgeA = length(IN[0].worldPos - IN[1].worldPos);
float EdgeB = length(IN[1].worldPos - IN[2].worldPos);
float EdgeC = length(IN[2].worldPos - IN[0].worldPos);
if(EdgeA > EdgeB && EdgeA > EdgeC)
param.y = 1.;
else if (EdgeB > EdgeC && EdgeB > EdgeA)
param.x = 1.;
else
param.z = 1.;
#endif
g2f o;
o.pos = mul(UNITY_MATRIX_VP, IN[0].worldPos);
o.bary = float3(1., 0., 0.) + param;
triStream.Append(o);
o.pos = mul(UNITY_MATRIX_VP, IN[1].worldPos);
o.bary = float3(0., 0., 1.) + param;
triStream.Append(o);
o.pos = mul(UNITY_MATRIX_VP, IN[2].worldPos);
o.bary = float3(0., 1., 0.) + param;
triStream.Append(o);
}
float _WireframeVal;
fixed4 _FrontColor;
fixed4 frag(g2f i) : SV_Target {
if(!any(bool3(i.bary.x <= _WireframeVal, i.bary.y <= _WireframeVal, i.bary.z <= _WireframeVal)))
discard;
return _FrontColor;
}
ENDCG
}
}
}
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