title: HLSL float4x4 individual floats
body: <p>Simple question, but how can I access single floats or float4's in a 4x4 matrix in HLSL?</p>
  
  <p>I tried: matrix._m00_m01_m02 for a float3 to no avail.
  I also tried matrix._00_01_02 to no avail.</p>
  
  <p>What is the correct way to get single floats or float3/4's of a matrix in HLSL?</p>
  
  <p>Also, how do I insert a float4 in a matrix?</p>