code: public void setObservations( List<Point2D_F64> observations , List<DMatrixRMaj> cameraMatrices ) {
  		if( observations.size() != cameraMatrices.size() )
  			throw new IllegalArgumentException("Different size lists");
  
  		this.observations = observations;
  		this.cameraMatrices = cameraMatrices;
  	}
docs: Configures inputs.
  
  @param observations Observations of the feature at different locations. Pixels.
  @param cameraMatrices Camera matrices