The right way to convert from object house to clip house

I wish to animate foliage with vertex animation however I’ve unsuitable output as a result of I can not correctrly remodel from object house to clip house, and my foliage goes off the mannequin. How Can I convert in corrent method the house?

fragmentInput vertexProgram(vertexInput information)
{
    UNITY_SETUP_INSTANCE_ID(information);

    fragmentInput output;
    float3 positionWS = TransformObjectToWorld(information.positionOS);
    output.positionCS = TransformWorldToHClip(positionWS);
    output.positionWSAndFog = float4(positionWS, ComputeFogFactor(output.positionCS.z));

    VertexNormalInputs normalInput = GetVertexNormalInputs(information.normalOS, information.tangentOS);
    output.normalWS = normalInput.normalWS;
    output.tangentWS = normalInput.tangentWS;
    output.bitangentWS = normalInput.bitangentWS;

    output.uv = TRANSFORM_TEX(information.uv, _BaseColor);

    output.viewDirectionWS = GetWorldSpaceViewDir(positionWS);

#ifdef _MAIN_LIGHT_SHADOWS
    output.shadowCoord = TransformWorldToShadowCoord(positionWS);
#endif

    OUTPUT_LIGHTMAP_UV(enter.staticLightmapUV, unity_LightmapST, output.staticLightmapUV);
    OUTPUT_SH(output.normalWS, output.vertexSH);
    
    // I am beginning my animation from right here
    float4 worldPos = mul(information.positionOS, unity_ObjectToWorld);
    float2 samplePos = worldPos.xz / _WorldSize.xz;
    samplePos += _Time.x * _WindSpeed.xy;
    float windSample = tex2Dlod(_WindTex, float4(samplePos, 0, 0));

    output.positionCS.x += sin(_WaveSpeed * windSample) * _WaveAmp;
    output.positionCS.z += cos(_WaveSpeed * windSample) * _WaveAmp;

    // then I sholud by some means convert to clip house if im not unsuitable
    return output;
}

Right here what I’ve bought: