message: fix Curves geometry numPrimitives count
  Was previously returning the number of indices divided by the number of
  vertices the curve basis requires. But the number of indices alone
  should be equal to the number of curve segments represented
diff: @@ -96,16 +96,7 @@ namespace ospray {
  size_t Curves::numPrimitives() const
  {
  - const bool haveIndices = indexData;
  -
  - if (!haveIndices)
  - return 0;
  -
  - uint32_t numVerts = 4;
  - if (curveBasis == OSP_LINEAR || curveBasis == OSP_HERMITE)
  - numVerts = 2;
  -
  - return indexData->numItems / numVerts;
  + return indexData->numItems;
  }
  LiveGeometry Curves::createEmbreeGeometry()
  