Custom shader go to black on android devices.

Questions & Answers
1

Hello, im have a shader demo liquid in the bottle. Shader run normaly in editor but have error in android devices. A part of shader become black. I try to read shader file but i did’t find where the error.
Some one can help me :frowning:
This is my picture off error.

Imgur

Imgur

And this is my shader :

Shader “Vertex Magic/Liquid” {

Properties {
	_MainTex   ("Main", 2D) = "white" {}
	_MainTint  ("Tint", Color) = (1, 1, 1, 1)
	_Fill      ("Fill Amount", Float) = 0
	_WobbleX   ("WobbleX", Float) = 0
	_WobbleZ   ("WobbleZ", Float) = 0
	_TopColor  ("Top Color", Color) = (1, 1, 1, 1)
	_FoamColor ("Foam Line Color", Color) = (1, 1, 1, 1)
	_FoamWidth ("Foam Line Width", Float) = 0    
	_RimColor  ("Rim Color", Color) = (1, 1, 1, 1)
	_RimPower  ("Rim Power", Float) = 0
}
SubShader {
	Tags { "Queue" = "Transparent" }
	Pass {
		Zwrite On Cull Off AlphaToMask On
		
		CGPROGRAM
		#pragma vertex vert
		#pragma fragment frag
		#include "UnityCG.cginc"
		struct v2f
		{
			float4 pos : SV_POSITION;
			float2 uv : TEXCOORD0;
			float3 view : TEXCOORD1;
			float3 norm : TEXCOORD2;
			float  edge : TEXCOORD3;
		};
		sampler2D _MainTex;
		float4 _MainTex_ST;
		float _Fill, _WobbleX, _WobbleZ, _FoamWidth, _RimPower;
		fixed4 _TopColor, _RimColor, _FoamColor, _MainTint;

		float4 RotateAroundY (float3 v, float degree)
		{
			float a = degree * UNITY_PI / 180.0;
			float s, c;
			sincos(a, s, c);
			float2x2 m = float2x2(c, s, -s, c);
			return float4(v.yz , mul(m, v.xz)).xzyw;            
		}
		v2f vert (appdata_full v)
		{
			float3 wldpos = mul(unity_ObjectToWorld, v.vertex.xyz);
			float3 wldposX = RotateAroundY(wldpos, 360.0);
			float3 wldposZ = float3(wldposX.y, wldposX.z, wldposX.x);
			float3 wldposAdjusted = wldpos + (wldposX  * _WobbleX)+ (wldposZ * _WobbleZ);
		
			v2f o;
			o.pos = UnityObjectToClipPos(v.vertex);
			o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
			o.edge = wldposAdjusted.y + _Fill;
			o.view = normalize(ObjSpaceViewDir(v.vertex));
			o.norm = v.normal;
			return o;
		}
		fixed4 frag (v2f i, fixed facing : VFACE) : SV_Target
		{
			fixed4 col = tex2D(_MainTex, i.uv) * _MainTint;

			// rim
			float3 V = normalize(i.view);
			float3 N = normalize(i.norm);
			float rim = 1.0 - pow(dot(N, V), _RimPower);
			float3 rimcol = _RimColor.rgb * smoothstep(0.5, 1.0, rim);

			// foam edge
			float4 foam = step(i.edge, 0.5) - step(i.edge, 0.5 - _FoamWidth);
			float4 result = step(i.edge, 0.5) - foam;
			float4 c1 = result * col;
			float4 c = c1 + (foam * _FoamColor);               
			c.rgb += rimcol;
			
			float4 topcol = _TopColor * (foam + result);
			return facing > 0 ? c: topcol;
		}
		ENDCG
    }
}
FallBack "Diffuse"

}

Thanks for reading.

2

Hello, if anyone have same problem can fix by this:
AlphaToMask is not support on devices mobile if not enable antialising x2, so you need turn of it.