Shader show different result between game view and scene view

Hi , Everyone

I am learning shader by myself ,and find this shader from my book, It’s a water shader.

But I notice that it have different result between scene view and game view , I also notice that if I change scene view camera from orthographic to perspective, It will have the same result to the game view, which is wrong result, the distortion of the water disappear.

I had google it but can not find anything similar to this. I believe that there is something that I can not understand behind it. Can someone explain it to me ? I really want to learn shader !

By Howard

Here is the code.
Shader “Unlit/Chapter15-WaterWave”
{
Properties
{
_Color(“Main Color”, Color) = (0, 0.15, 0.115, 1)
_MainTex (“Texture”, 2D) = “white” {}
_WaveMap(“WaveMap”, 2D) = “bump” {}
_CubeMap(“Enviornment CubeMap”, Cube) = “_Skybox” {}
_WaveXSpeed(“Wave Horizontal Speed”, Range(-0.1, 0.1)) = 0.01
_WaveYSpeed(“Wave Vertical Speed”, Range(-0.1, 0.1)) = 0.01
_Distortion(“Distortion”, Range(0, 100)) = 10
}
SubShader
{
Tags { “Queue” = “Transparent” “RenderType” = “Opaque” }

        LOD 100

        GrabPass { "_RefractionTex" }

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            fixed4 _Color;
            sampler2D _MainTex;
            float4 _MainTex_ST;
            sampler2D _WaveMap;
            float4 _WaveMap_ST;
            samplerCUBE _CubeMap;
            fixed _WaveXSpeed, _WaveYSpeed;
            float _Distortion;
            sampler2D _RefractionTex;
            float4 _RefractionTex_TexelSize;

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
                float3 normal : NORMAL;
                float4 tangent : TANGENT;
            };

            struct v2f
            {
                float4 pos : SV_POSITION;
                float4 scrPos : TEXCOORD0;
                float4 uv : TEXCOORD1;
                float4 TtoW0 : TEXCOORD2;
                float4 TtoW1 : TEXCOORD3;
                float4 TtoW2 : TEXCOORD4;
            };

            
            v2f vert (appdata v)
            {
                v2f o;
                o.pos = UnityObjectToClipPos(v.vertex);

                o.scrPos = ComputeGrabScreenPos(o.pos);

                o.uv.xy = TRANSFORM_TEX(v.uv, _MainTex);
                o.uv.zw = TRANSFORM_TEX(v.uv, _WaveMap);

                float3 worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
                fixed3 worldNormal = UnityObjectToWorldNormal(v.normal);
                fixed3 worldTangent = UnityObjectToWorldDir(v.tangent.xyz);
                fixed3 worldBinormal = cross(worldNormal, worldTangent) * v.tangent.w;

                o.TtoW0 = float4(worldTangent.x, worldBinormal.x, worldNormal.x, worldPos.x);
                o.TtoW1 = float4(worldTangent.y, worldBinormal.y, worldNormal.y, worldPos.y);
                o.TtoW2 = float4(worldTangent.z, worldBinormal.z, worldNormal.z, worldPos.z);

                return o;
            }

            fixed4 frag(v2f i) : SV_Target
            {
                float3 worldPos = float3(i.TtoW0.w, i.TtoW1.w, i.TtoW2.w);
                fixed3 viewDir = normalize(UnityWorldSpaceViewDir(worldPos));
                float2 speed = _Time.y * float2(_WaveXSpeed, _WaveYSpeed);

                // Get the normal in tangent space
                fixed3 bump1 = UnpackNormal(tex2D(_WaveMap, i.uv.zw + speed)).rgb;
                fixed3 bump2 = UnpackNormal(tex2D(_WaveMap, i.uv.zw - speed)).rgb;
                fixed3 bump = normalize(bump1 + bump2);

                //Compute the offset in tangent space
                float2 offset = bump.xy * _Distortion * _RefractionTex_TexelSize.xy;
                i.scrPos.xy = offset * i.scrPos.z + i.scrPos.xy;
                fixed3 refrCol = tex2D(_RefractionTex, i.scrPos.xy / i.scrPos.w).rgb;

                // Convert the normal to world space
                bump = normalize(half3(dot(i.TtoW0.xyz, bump), dot(i.TtoW1.xyz, bump), dot(i.TtoW2.xyz, bump)));

                fixed4 texColor = tex2D(_MainTex, i.uv.xy + speed);
                fixed3 reflDir = reflect(-viewDir, bump);
                fixed3 cubeCol = texCUBE(_CubeMap, reflDir).rgb;
                fixed3 reflCol = cubeCol * texColor.rgb * _Color.rgb;

                fixed fresnel = pow(1 - saturate(dot(viewDir, bump)), 4);
                fixed3 finalColor = reflCol * fresnel + refrCol * (1 - fresnel);

                return fixed4(finalColor, 1);
            }
            ENDCG
        }
    }

    FallBack "Diffuse"
}

and here is the result

Please~~~!!!

hi, Anybody ?