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I need to change shading technique to physically based (want make metallic refractions on material).

Currently i have that chunck of code in .dae:

<technique sid="common">
 <blinn>
  <ambient>
   <color>0.484529 0.484529 0.484529 1</color>
  </ambient>
  <diffuse>
   <color>0.837421 0.837421 0.837421 1</color>
  </diffuse>
  <shininess>
   <float>0.022516</float>
  </shininess>
  <reflective>
   <color>0 0 0 1</color>
  </reflective>
  <transparent opaque="A_ONE">
   <color>1 1 1 1</color>
  </transparent>
  <transparency>
   <float>1</float>
  </transparency>
  <index_of_refraction>
   <float>1</float>
  </index_of_refraction>
 </blinn>
</technique>
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