Tilemap outline issue

Hi,

I am making a platformer game which has a bunch of platforms. I am adding outline to the map by using a shader but having the following issue:

When the tile asset size is equal to that of the GRID TILE SIZE, the outlines only show up on edges.

I believe that somehow the texture that the Tile renderer generates is being clipped. The outlines appear on the edge because there is some empty space..


When the tile size is smaller than the GRID TILE SIZE, the outlines show up.



Does anyone have a suggestion? I am using the following shader

Code (CSharp):

1. Shader "Sprites/Outline"
2. {
3.     Properties
4.     {
5.         [PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
6.         _Color ("Tint", Color) = (1,1,1,1)
7.         [MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
8.         [HideInInspector] _RendererColor ("RendererColor", Color) = (1,1,1,1)
9.         [HideInInspector] _Flip ("Flip", Vector) = (1,1,1,1)
10.         [PerRendererData] _AlphaTex ("External Alpha", 2D) = "white" {}
11.         [PerRendererData] _EnableExternalAlpha ("Enable External Alpha", Float) = 0
12.  
13.         // Add values to determine if outlining is enabled and outline color.
14.         [PerRendererData] _Outline("Outline", Float) = 0
15.         [PerRendererData] _OutlineColor("Outline Color", Color) = (1,1,1,1)
16.         [PerRendererData] _OutlineSize("Outline Size", int) = 1
17.     }
18.  
19.     SubShader
20.     {
21.         Tags
22.         {
23.             "Queue"="Transparent"
24.             "IgnoreProjector"="True"
25.             "RenderType"="Transparent"
26.             "PreviewType"="Plane"
27.             "CanUseSpriteAtlas"="True"
28.         }
29.  
30.         Cull Off
31.         Lighting Off
32.         ZWrite Off
33.         Blend One OneMinusSrcAlpha
34.  
35.         Pass
36.         {
37.         CGPROGRAM
38.             #pragma vertex SpriteVert
39.             #pragma fragment frag
40.             #pragma target 2.0
41.             #pragma multi_compile_instancing
42.             #pragma multi_compile _ PIXELSNAP_ON
43.             #pragma multi_compile _ ETC1_EXTERNAL_ALPHA
44.             #include "UnitySprites.cginc"
45.  
46.             float _Outline;
47.             fixed4 _OutlineColor;
48.             int _OutlineSize;
49.             float4 _MainTex_TexelSize;
50.  
51.             fixed4 frag(v2f IN) : SV_Target
52.             {
53.                 fixed4 c = SampleSpriteTexture(IN.texcoord) * IN.color;
54.  
55.                 // If outline is enabled and there is a pixel, try to draw an outline.
56.                 if (_Outline > 0 && c.a != 0) {
57.                     float totalAlpha = 1.0;
58.  
59.                     [unroll(16)]
60.                     for (int i = 1; i < _OutlineSize + 1; i++) {
61.                         fixed4 pixelUp = tex2D(_MainTex, IN.texcoord + fixed2(0, i * _MainTex_TexelSize.y));
62.                         fixed4 pixelDown = tex2D(_MainTex, IN.texcoord - fixed2(0,i *  _MainTex_TexelSize.y));
63.                         fixed4 pixelRight = tex2D(_MainTex, IN.texcoord + fixed2(i * _MainTex_TexelSize.x, 0));
64.                         fixed4 pixelLeft = tex2D(_MainTex, IN.texcoord - fixed2(i * _MainTex_TexelSize.x, 0));
65.  
66.                         totalAlpha = totalAlpha * pixelUp.a * pixelDown.a * pixelRight.a * pixelLeft.a;
67.                     }
68.  
69.                     if (totalAlpha == 0) {
70.                         c.rgba = fixed4(1, 1, 1, 1) * _OutlineColor;
71.                     }
72.                 }
73.  
74.                 c.rgb *= c.a;
75.  
76.                 return c;
77.             }
78.         ENDCG
79.         }
80.     }
81. }
82.  

 

Hello,
Sorry to see no-one has been able to help you... that's sadly often the case regarding Tilemaps AFAIK...
Alas I can't help you either, as you seem to have more knowledge than me regarding this topic.

I'm here to ask you about something I noticed in your shader: I see you're using [PerRendererData] on a shader intended for Tilemaps. How does that work?
I mean, I know how to use it when I have a renderer (e.g. SpriteRenderer) per object, and I can pass my MaterialPropertyBlock with my data for this specific object. But would you happen to know if there's a way to use [PerRendererData] with Tiles, so that I can pass some data specific to each tile (just like they do for _MainTex) ?

In case you want some context, I'm trying to do some masking on my tiles, and would like to find a way to pass a mask texture specific to each individual tile to be able to access it from the frag.

Thanks in advance.

 

Hi, honestly I just picked up an online shader and tried modify it. I am afraid I can't help you out since I don't have much shader knowledge

 

Haha then I'm outta luck.
Thanks anyways.

 

Thanks for the answer!
Coincidentally I'm actually currently in the process of trying this new secondary texture feature in 19.2, and that indeed looks like an interesting thing!
I did try it with normal maps and it seems to be working fine with Tilemap, so now I'm gonna try with my mask + my custom shader instead but it should work just like the normal map, which would be wonderful.

The only problem I've found so far with that feature is that apparently it breaks when I try atlasing the sprites... or did I do something wrong? Because unfortunately if that's the case I'm afraid it's still a no-go, as I definitely want to keep my atlases for performance reasons.

 

Exactly. To be fair, I could actually already do that without secondary textures to fix my original issue for Tilemaps and use my custom masks, but it being too annoying in our pipeline was already what made me try to find alternatives.

Not asking for an actual precise ETA and I understand fully that whatever you answer, this will be fully "off the record" and not binding at all but... do you have a vague idea of when I could potentially expect that to be supported?
I just wabt to be able to wrap my head around whether I can potentially hope for it being available at some point during my current project's development cycle or if I'd better completely drop the idea.