Vertex displacement

float3 worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
float3 worldNormal = mul(float4(v.normal,0.0),unity_WorldToObject).xyz;

o.pos = mul(UNITY_MATRIX_VP, float4(worldPos,1.0)+
        (0.8+0.5*sin(5.0*worldPos.z+5.0*_Time.y))*
        (0.5+0.5*sin(10.0*_Time.y+10.0*worldPos.x))*float4(worldNormal,0.0));