Blend touching triangle textures

Hello! I made a project where a voxel terrain system uses a specific vertex color to determine the texture used for that voxel. This works fine - but has very sharp edges and looks quite bad. I was wondering if there's any way to make the edges blend together.



Thanks! Current shader code below:

Code (CSharp):

1. // Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'
2.  
3. Shader"Triplanar" {
4.   Properties {
5.     _ArrTex("TextureArr", 2DArray) = "" {}
6.     scale("Scale", Float) = 1
7.     _brightness("Texture Brightness", Float) = 1
8.     _SpecColor("Specular Material Color", Color) = (1, 1, 1, 1)
9.     _Shininess("Shininess", Float) = 10
10.   }
11.   SubShader {
12.     Pass {
13.       Tags { "LightMode" = "ForwardBase" }
14.  
15. CGPROGRAM
16. #pragma multi_compile_fwdbase
17. #pragma vertex vert
18. #pragma fragment frag
19. #include"UnityCG.cginc"
20. #include"AutoLight.cginc"
21.  
22. struct v2f
23. {
24.     float3 worldPos : TEXCOORD0;
25.     half3 worldNormal : TEXCOORD1;
26.     float4 pos : SV_POSITION;
27.     float4 color : COLOR;
28.         LIGHTING_COORDS(2, 3)
29. };
30.  
31. v2f vert(float4 vertex : POSITION, float3 normal : NORMAL, float4 color : COLOR)
32. {
33.     v2f o;
34.     o.color = color;
35.     o.pos = UnityObjectToClipPos(vertex);
36.     o.worldPos = mul(unity_ObjectToWorld, vertex).xyz;
37.     o.worldNormal = UnityObjectToWorldNormal(normal);
38.     TRANSFER_VERTEX_TO_FRAGMENT(o);
39.     return o;
40. }
41.  
42. float scale;
43. float _brightness;
44. float4 _SpecColor;
45. float _Shininess;
46.  
47. UNITY_DECLARE_TEX2DARRAY(_ArrTex);
48.  
49. fixed4 frag(v2f i) : SV_Target
50. {
51.  
52.         //////////////////////////////////   TRIPLANAR   ////////////////////////////////
53.  
54.     half texid = i.color.x * 255;
55.     half3 norm = i.worldNormal;
56.         // in wNorm is the world-space normal of the fragment
57.     vector blending = abs(float4(norm.x, norm.y, norm.z, 0));
58.     blending = normalize(max(blending, 0.00001)); // Force weights to sum to 1.0
59.     float b = (blending.x + blending.y + blending.z);
60.     blending /= vector(b, b, b, 1);
61.  
62.     float4 xaxis = UNITY_SAMPLE_TEX2DARRAY(_ArrTex, float3(i.worldPos.y, i.worldPos.z, texid) * scale);
63.     float4 yaxis = UNITY_SAMPLE_TEX2DARRAY(_ArrTex, float3(i.worldPos.x, i.worldPos.z, texid) * scale);
64.     float4 zaxis = UNITY_SAMPLE_TEX2DARRAY(_ArrTex, float3(i.worldPos.x, i.worldPos.y, texid) * scale);
65.  
66.         // in float scale
67.     float4 tex = xaxis * blending.x + yaxis * blending.y + zaxis * blending.z;
68.  
69.     tex = tex * _brightness;
70.  
71.         //////////////////////////////      LIGHTING     ////////////////////////////////
72.  
73.     float attenuation = LIGHT_ATTENUATION(i);
74.     tex = tex * attenuation;
75.  
76.         ////////////////////////////////////////////////////////////////////////////////////
77.  
78.     return tex;
79.  
80. }
81.       ENDCG
82.     }
83.  
84.     Pass {
85.  
86. Blend one one
87.  
88.       Tags { "LightMode" = "ForwardAdd" }
89.  
90. CGPROGRAM
91. #pragma vertex vert
92. #pragma fragment frag
93. #include"UnityCG.cginc"
94. #pragma multi_compile_fwdadd_fullshadows
95. #include"AutoLight.cginc"
96.  
97. struct v2f
98. {
99.     float3 worldPos : TEXCOORD0;
100.     half3 worldNormal : TEXCOORD1;
101.     float4 pos : SV_POSITION;
102.     float4 color : COLOR;
103.         LIGHTING_COORDS(2, 3)
104. };
105.  
106. v2f vert(appdata_base v, float4 vertex : POSITION, float3 normal : NORMAL, float4 color : COLOR)
107. {
108.     v2f o;
109.     o.color = color;
110.     o.pos = UnityObjectToClipPos(vertex);
111.     o.worldPos = mul(unity_ObjectToWorld, vertex).xyz;
112.     o.worldNormal = UnityObjectToWorldNormal(normal);
113.     TRANSFER_VERTEX_TO_FRAGMENT(o);
114.     return o;
115. }
116.  
117. float scale;
118. float _brightness;
119. float4 _SpecColor;
120. float _Shininess;
121.  
122.       UNITY_DECLARE_TEX2DARRAY(_ArrTex);
123.  
124. fixed4 frag(v2f i) : SV_Target
125. {
126.  
127.         //////////////////////////////////   TRIPLANAR   ////////////////////////////////
128.  
129.     half texid = i.color.x * 255;
130.     half3 norm = i.worldNormal;
131.         // in wNorm is the world-space normal of the fragment
132.     vector blending = abs(float4(norm.x, norm.y, norm.z, 0));
133.     blending = normalize(max(blending, 0.00001)); // Force weights to sum to 1.0
134.     float b = (blending.x + blending.y + blending.z);
135.     blending /= vector(b, b, b, 1);
136.  
137.     float4 xaxis = UNITY_SAMPLE_TEX2DARRAY(_ArrTex, float3(i.worldPos.y, i.worldPos.z, texid) * scale);
138.     float4 yaxis = UNITY_SAMPLE_TEX2DARRAY(_ArrTex, float3(i.worldPos.x, i.worldPos.z, texid) * scale);
139.     float4 zaxis = UNITY_SAMPLE_TEX2DARRAY(_ArrTex, float3(i.worldPos.x, i.worldPos.y, texid) * scale);
140.  
141.         // in float scale
142.     float4 tex = xaxis * blending.x + yaxis * blending.y + zaxis * blending.z;
143.  
144.     tex = tex * _brightness;
145.  
146.         //////////////////////////////      LIGHTING     ////////////////////////////////
147.  
148.     float attenuation = LIGHT_ATTENUATION(i);
149.     tex = tex * attenuation;
150.  
151.         ////////////////////////////////////////////////////////////////////////////////////
152.  
153.     return tex;
154.  
155. }
156.  
157.       ENDCG
158.  
159.     }
160.  
161.   }
162.  
163. Fallback"VertexLit"
164.  
165. }

 

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