How to prevent my projector from being clipped?

I'm using projector with this shader. (source: https://hyunkell.com/blog/rts-style-unit-selection-in-unity-5/)

Code (CSharp):

1. Shader "Projector/AdditiveTint" {
2. Properties {
3.     _Color ("Tint Color", Color) = (1,1,1,1)
4.     _Attenuation ("Falloff", Range(0.0, 1.0)) = 1.0
5.     _ShadowTex ("Cookie", 2D) = "gray" {}
6. }
7. Subshader {
8.     Tags {"Queue"="Transparent"}
9.     Pass {
10.         ZWrite Off
11.         ColorMask RGB
12.         Blend SrcAlpha One // Additive blending
13.         Offset -1, -1
14.  
15.         CGPROGRAM
16.         #pragma vertex vert
17.         #pragma fragment frag
18.         #include "UnityCG.cginc"
19.  
20.         struct v2f {
21.             float4 uvShadow : TEXCOORD0;
22.             float4 pos : SV_POSITION;
23.         };
24.  
25.         float4x4 unity_Projector;
26.         float4x4 unity_ProjectorClip;
27.  
28.         v2f vert (float4 vertex : POSITION)
29.         {
30.             v2f o;
31.             o.pos = UnityObjectToClipPos (vertex);
32.             o.uvShadow = mul (unity_Projector, vertex);
33.             return o;
34.         }
35.  
36.         sampler2D _ShadowTex;
37.         fixed4 _Color;
38.         float _Attenuation;
39.  
40.         fixed4 frag (v2f i) : SV_Target
41.         {
42.             // Apply tint & alpha mask
43.             fixed4 texCookie = tex2Dproj (_ShadowTex, UNITY_PROJ_COORD(i.uvShadow));
44.             fixed4 outColor = _Color * texCookie.a;
45.             // Distance attenuation
46.             float depth = i.uvShadow.z; // [-1(near), 1(far)]
47.             return outColor * clamp(1.0 - abs(depth) + _Attenuation, 0.0, 1.0);
48.         }
49.         ENDCG
50.     }
51. }

It works perfectly unless I try to move far away from it.



I tried to just return _Color * texCookie.a in the frag function but it still clips the projector. Could anyone shed some light on this? I'm still really new with shaders. If you could also recommend a good book about shaders in unity I would really appreciate it. Thank you.

 

I suspect you're not doing anything wrong, this is likely the projector not taking into account terrain LOD. Unfortunately there's not much you can do to fix that from the projector or shader side. You could play with your terrain settings to push the LOD distance further away.

 

Thank you for the reply. I actually solved it by unchecking generate mip maps on the the texture settings. I found the solution here in case someone wants it. https://en.wikibooks.org/wiki/Cg_Programming/Unity/Projectors

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