- added method setModelToShoebox which allows you define/create/simulate a shoebox room

- added example script for the simulation of a shoebox room created by this method

applications/VirtualAcoustics/Raven/ita_raven_demo_shoebox.m

+%% RAVEN simulation: Example for creating shoebox room model
+
+% Author: las@akustik.rwth-aachen.de
+% date:     2019/04/10
+
+%% project settings
+myLength=10;
+myWidth=8;
+myHeight=3;
+projectName = [ 'myShoeboxRoom' num2str(myLength) 'x' num2str(myWidth) 'x' num2str(myHeight) ];
+
+%% create project and set input data
+rpf = itaRavenProject('C:\ITASoftware\Raven\RavenInput\Classroom\Classroom.rpf');   % modify path if not installed in default directory
+rpf.copyProjectToNewRPFFile(['C:\ITASoftware\Raven\RavenInput\' projectName '.rpf' ]);
+rpf.setProjectName(projectName);
+rpf.setModelToShoebox(myLength,myWidth,myHeight);
+
+% set values of six surfaces: 
+% 10% absorption and 10% scattering for floor and ceiling
+% Identical material with 5% absorption and 20% scattering for walls
+
+for iMat=1:2
+   myAbsorp = 0.1 * ones(1,31);
+   myScatter = 0.1 * ones(1,31);
+   rpf.setMaterial(rpf.getRoomMaterialNames{iMat},myAbsorp,myScatter);
+end
+
+
+for iMat=3:6
+   myAbsorp = 0.05 * ones(1,31);
+   myScatter = 0.2 * ones(1,31);
+   rpf.setMaterial(rpf.getRoomMaterialNames{iMat},myAbsorp,myScatter);
+end
+
+% uncomment to see plot of room and absorption coefficient
+% rpf.plotMaterialsAbsorption;
+% rpf.plotModel;
+
+%% set simulation parameters
+rpf.setGenerateRIR(1);
+rpf.setGenerateBRIR(1);
+rpf.setSimulationTypeRT(1);
+rpf.setSimulationTypeIS(1);
+rpf.setNumParticles(20000);
+rpf.setISOrder_PS(2);
+
+%% run simulation
+rpf.run
+
+% RIR = rpf.getMonauralImpulseResponseItaAudio;
+% RIR.ptd;
+T30_firstRoom = rpf.getT30;
+
+% Now change the room, double all dimensions
+rpf.setModelToShoebox(myLength*2,myWidth*2,myHeight*2);
+rpf.run;
+T30_secondRoom = rpf.getT30;
+
+%% plot results
+figure;
+semilogx(rpf.freqVectorOct,[T30_firstRoom T30_secondRoom]','LineWidth',1.5,'Marker','x');
+grid on;ylabel('T30 in s');xlabel('Frequency in Hz');title('T30 of two shoebox rooms');xlim([20 20000]);
+legend(['Room 1 (V= ' num2str(myLength*myWidth*myHeight) ' m)'],['Room 2 (V= ' num2str(2*myLength*2*myWidth*2*myHeight) ' m)']);
+
+
+