title: Can you look sample a texture in a vertex shader?
body: <p>In shader model 3.0, I'm pretty sure this was a <em>no</em> but I want to ask this anyway,</p>
  
  <p>In shader model 5.0, can you sample a texture in a vertex shader?</p>
  
  <p>If I want to make large amounts of supplementary information available per-vertex, what are my options?</p>
  
  <p>Edit:
  Apparently it <em>is</em> possible to do a Vertex Texture Fetch, as done <a href="http://http.developer.nvidia.com/GPUGems2/gpugems2_chapter18.html" rel="noreferrer">here</a>, but when I try it in my hlsl shader model 5 program, I get the error </p>
  
  <blockquote>
  error X4532: cannot map expression to vs_5_0 instruction set
  </blockquote>