code: public void setObservations( List<Point2D_F64> observations,
  								 List<DMatrixRMaj> essential ) {
  		this.observations = observations;
  		this.essential = essential;
  	}
docs: Configures inputs.
  
  @param observations Observations of the feature at different locations. Normalized image coordinates.
  @param essential Essential matrices associated with camera motion (world to camera)