关于Unity Shader中的动画shader，出现了莫名其妙的bug

跟着Unity Shader入门精要这本书学习的
学习到11.2章节的时候，写出来的shader跟他给的案例基本没什么区别，但是我的shader导致uv的Y轴撕裂严重，他的肯定是一切正常的，但当我一步步的替换成他的代码来debug的时候，依旧达不到预期的效果，诡异的事情出现，我直接一个c+a c+c然后c+v到我的代码中，一摸一样的代码，就出出来的不同的效果，依旧是UV的Y轴撕裂严重。
···
这个是我的UV撕裂严重的效果

···
···
这个是正常的效果

···
···
Shader "Unity Shaders Book/Chapter 11/Image Sequence Animation" {
Properties {
_Color ("Color Tint", Color) = (1, 1, 1, 1)
_MainTex ("Image Sequence", 2D) = "white" {}
_HorizontalAmount ("Horizontal Amount", Float) = 4
_VerticalAmount ("Vertical Amount", Float) = 4
_Speed ("Speed", Range(1, 100)) = 30
}
SubShader {
Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
Pass {
Tags { "LightMode"="ForwardBase" }
ZWrite Off
Blend SrcAlpha OneMinusSrcAlpha
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
fixed4 _Color;
sampler2D _MainTex;
float4 _MainTex_ST;
float _HorizontalAmount;
float _VerticalAmount;
float _Speed;
struct a2v {
float4 vertex : POSITION;
float2 texcoord : TEXCOORD0;
};
struct v2f {
float4 pos : SV_POSITION;
float2 uv : TEXCOORD0;
};
v2f vert (a2v v) {
v2f o;
o.pos = UnityObjectToClipPos(v.vertex);
o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
return o;
}
fixed4 frag (v2f i) : SV_Target {
float time = floor(_Time.y * _Speed);
float row = floor(time / _HorizontalAmount);
float column = time - row * _HorizontalAmount;
//half2 uv = float2(i.uv.x /_HorizontalAmount, i.uv.y / _VerticalAmount);
//uv.x += column / _HorizontalAmount;
//uv.y -= row / _VerticalAmount;
half2 uv = i.uv + half2(column, -row);
uv.x /= _HorizontalAmount;
uv.y /= _VerticalAmount;
fixed4 c = tex2D(_MainTex, uv);
c.rgb *= _Color;
return c;
}
ENDCG
}
}
FallBack "Transparent/VertexLit"
}
···
这个是元代码
···
Shader "Custom/Chapter11-ImageScequnceAnimationShader"
{
Properties
{
_Color ("Color Tint", Color) = (1,1,1,1)
_MainTex ("Image Sequence", 2D) = "white" {}
//_ HorizontalAmount and _ VerticalAmount respectively represent
//the number of key frame images contained in the image in
//the horizontal and vertical directions.
_HorizontalAmount("Horizontal Amount",Float) =4
_VerticalAmount("Vertical Amount",Float) =4
_Speed("Speed",Range(1,100))=30
}
SubShader
{
Tags
{
"Queue"="Transparent"
"RenderType"="Transparent"
"IgnoreProjector"="True"
}
Pass
{
Tags
{
"LightMode"="ForwardBase"
}
ZWrite Off
Blend SrcAlpha OneMinusSrcAlpha
CGPROGRAM
// Physically based Standard lighting model, and enable shadows on all light types
#pragma vertex vert
// Use shader model 3.0 target, to get nicer looking lighting
#pragma fragment frag
#include "UnityCG.cginc"
#include "Lighting.cginc"
#include "AutoLight.cginc"
sampler2D _MainTex;
fixed4 _Color;
float4 _MainTex_ST;
float _HorizontalAmount;
float _VerticalAmount;
float _Speed;
struct a2v
{
float4 vertex:POSITION;
float2 texcoord:TEXCOORD0;
};
struct v2f
{
float4 pos:SV_POSITION;
float uv : TEXCOORD0;
};
v2f vert(a2v v)
{
v2f o;
o.pos = UnityObjectToClipPos(v.vertex);
o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
return o;
}
fixed4 frag(v2f i) :SV_Target
{
float time = floor(_Time.y * _Speed);
float row = floor(time / _HorizontalAmount);
float column = time - row * _HorizontalAmount;
//half2 uv = float2(i.uv.x/_HorizontalAmount,i.uv.y/_VerticalAmount);
//uv.x += colum/_HorizontalAmount;
//uv.y -= row/_VerticalAmount;
half2 uv = i.uv + half2(column, -row);
uv.x /= _HorizontalAmount;
uv.y /= _VerticalAmount;
fixed4 c = tex2D(_MainTex, uv);
c.rgb *= _Color;
return c;
}
ENDCG
}
}
FallBack "Transparent/VertixLit"
}
···
这个是我的代码
主要是，即使我完全复制了元代码，UV的撕裂还是很严重
但我用提供的案例shader的时候就正常了
而且用在的是同一个材质跟贴图
。。。
有大大遇到这种情况么