A brief User Guide for Seamless Landscape Explorer
Contents
1. o ee OCC OOHe og eo SDeesee 00e eee e ea ee 0 of o0 09 e 090 ce 200 ooo 00 eee 09000 o o 9 o o9 seamless eos CREER a a o gt 0 000 see EEE er e0 0 002 oa A brief User Guide for Seamless Landscape Explorer Manage and visualize landscape data By S bastien Griffon and Daniel Auclair December 2008 SLE User Manual Seamless Landscape Explorer S L E is a software that computes a virtual landscape from accurate spatial data and delivers a reasonable realistic representation of an existing landscape To realize this visualization it is necessary to follow two successive stages allowing to load and parametrize and to export the data which will be used by the renderer 1 Load_and parameter setting of the data To manipulate the data we propose a user friendly Open Source Geographic Information System GIS named Quantum GIS QGIS QGIS allows you to create visualise query and analyse a variety of spatial data types including terrain texture orthoimagery raster maps digital height models DTM DSM or vector based 2D geo objects The graphic interface of QGIS appears in the following way Add Vector layer Add Raster layer Add PostGIS layer Quantum GS 0 11 0 Metre PCSiLoup Rk amp w GS landusemash BE culture M sone a g El ortho E 20010722 1ih 34 2001 OF 22 1867 34 Data layers 8 i 2001 0722 1866 34 E x E 20010722186534 E xig 2001072. Double click on a cell of the Inter row column or Intra row column to enter the spacing value in meter The scale variation information This is used to generate variations in the appearance of objects and is particularly useful when billboards are used to render trees Double click on a cell of the Scale column to enter a value between 0 and 100 The level of detail The object can be displayed in 2D billboards or in 3D according the distance of the camera Click on the checkbox of the Full Geometry column User can remove a mesh by clicking on Remove Mesh button Then he needs to save the mesh configurations for this land use When he returned on the previous window he just has to click on compute terrain to start the visualization c The 3D visualisation According the amount of data the user needs to wait before the 3d display Once computed the 3D landscape is loaded and user can move into the scene with the keyboard see 1 2 in this section for the control keys A compass can help the user for the navigation d The 3D object importer Properties Layers Object Rendering Import 3D Models can choose AMAP Lig file format Choose Amap Lig Files Choose Mesh Files Click on Browse Lig Open a File Browser User Click on Browse Mesh Open a File Browser User can choose Mesh file format Once selected the 3D object is loaded in the 3D view User can move the object with Right Click Mouse Cursor Right
3. On Left Click the object is positioned e The rendering option Properties EJ Layers Object Rendering o Compute High Poly screenshot Full 30 Shadows 3 Sky rendering Render sky Modify sun position Time Speed J o Modify cloud density Modify Fog density Modify rain intensity Lighting Power Compute terrain shadows Stereo Render stereo Hydro Render hydro J J J J 1 Shot Take a screenshot Save the current viewport on the current directory SLElnstallDirectory bin release screenshot_i png where i is the screenshot number 2 Full 3D When activated all the geometry in a 200 m diameter circle around the camera is displayed when user takes screenshot 3 Shadows When activated shadows in a 200 m diameter circle around the camera 1s displayed when user takes screenshot 4 Render Sky When activated the sky is rendered User can parameterize the sky rendering with the options below 5 Modify Sun Position Slider to modify the sun time The centre slider position is midday 6 Time Speed Slider to modify the time speed By default the time is paused When slider is moved to the right the time speed is increased sun time The centre slider position is midday 7 Modity cloud density Slider to modify the cloud density When slider is moved to the right cloud density is increased 8 Modify fog density Slider to modify the fog density When slider is mo
4. different parts the menu bar 1 the 3D view 2 and the SLE configuration 3 The menu bar part 1 e File Load project Ctrl P load a SLE project Quit quit SLE e Edit Full screen Ctrl F10 show the 3D view in full screen e Help About the credits The 3D view part 2 You can navigate in 3D with the keyboard e Left control Move left e Right control Move right e Up control Move forward e Down control Move backward e PgUp Move up e PgDn Move down e Right Click Cursor Right Rotate right e Right Click Cursor Left Rotate left e D Render terrain solid wireframe point e F Anisotropic filtering On Off e F1 Takes a screenshot placed in the current directory e Insert Record the camera path e Return Play the recorded camera path e Space Record keyframe camera position e Change frequency between two keyframes The SLE configuration part 3 This part consists of three tables The land use configuration table user can edit the geo typical configuration texture and vegetation for each land use class e The object importer table user can import 3d object and insert it at a specific place e The rendering table user can edit rendering options b The land use configuration When a project is loaded into SLE you need to configure the texture and 3d objects to add for each land use type KT bois ferm Es bois ouvert jen garrigue ferm e x garrigue
5. i i 2001 0720 1865 34 A popup window appears and allows you to choose which specific attributes of the land use layer you wish to visualize Landuse combo box scenario 1 Landscape name MyProject Browse Matrix File Compute Select a land use attribute data from the ComboBox enter a name for the SLE project and click on compute Data are automatically cropped fused and formatted to be visualized An xml project file with geo reference and land use information is also written Next SLE is launched and user can edit the geo typical configuration texture and vegetation for each land use class 3 S L E a The SLE Graphic User Interface E Seamless Land Explorer Seles File Edit Help Properties Layers Object Rendering LandUse Fields Select Mesh Texture to each field LandUse Texture garrigue ferm e Grassi jpg bois Ferm Grass2 jpg garrigue ouvert Grass3 jpg zone urbaine Grass0 jpg bois ouvert Grassi jpg pelouse Grass2 jpg rivi re Grass3 jpg tendue d eau Grass0 jpg prairie Grass1 jpg Load Ogre Camera Save Ogre Camera Load Ogre Animation Path Mode IDLE INSERT record Animation Len RETURN play Save Ogre Animation Path Keyframes O SPACE manual keyframe Recording Freq 3 J change freq playback Compute terrain Current Pos FPS 15 Triangles 258037 Position 43 3626 2 08263 34 8289 The graphic interface of SLE can be divided into three
6. 2118673 xE 2001 0721 1866 34 X 2001 0722 1063 34 OA TA ance os N Peer S k ERE an Aarin ee A 2 Echelle 1 3520474023 7181611863530 me Randu Mol Load a QGIS project Save a QGIS project QGIS proj Toobar Map View All this information can be founded in the User and Installation Guide of QGIS at http download osgeo org qgis doc manual qgis 0 9 1_user_guide_en pdf To use correctly SLE you first have to load in QGIS at least one landuse layer with landuse attribute table and one digital elevation model DEM You can also optionally add orthophotos Then you have to rename every layer so that it is correctly exported towards SLE right click on the layer Rename e Rename the land use layer landuse e Rename the DEM layer terrain e Rename the orthophotos layer ortho You can now save your project in QGIS 2 Export towards SLE The SLE software allows choosing exactly the zone which we wish to see represented For that purpose it is necessary that the zone of display of QGIS Map View corresponds to the area which we wish to export When this choice is done you have to open the menu Plugins and select SLE Exporter then Export 3D landscape Quantum GIS 0 71 0 Metis PCStLoup 20010721 1868 34 i El 2001 0721 1865 34 Ds De x El 2001 0721 1863 34 Le aa El 2001 0 20 1866 34 E 20010721 1864 34 El 2001 0720 1867 34 ET i E 2001 0720 1866 34
7. k on a cell of the Density column and enter a value This 1s a factor between 0 and 100 The list of 3D objects on this land use When you double click on a cell of the Mesh column a new window with the following parameters appears Select Mesh For this field Mesh Spatial Density ing Conky iF line acing fonly if line sf Scale Full Geometry Enable wind 1 D SLEDemo med rand 1 Ful wind 2 Rae rand 1 Full wind lt gt Add Mesh In this panel user can add meshes to the selected land use by clicking on Add Mesh A new line into the table is created where user can edit O The 3D object file It is possible also to define objects like rocks as long as they have a natural distribution double click on a cell of the Mesh column to open a file browser and choose a mesh file mesh format only The type of spatialization the object s distribution over the terrain can be done randomly or by rows Double click on a cell of the Spatial column to enter rand for random positions or line for aligned positions The density This is used in conjunction with a random offset to determine the number of objects in a specific area Double click on a cell of the Density column to enter a value between 0 and 100 The inter row Intra row spacing This is used in conjunction with rows spatialization to specify the distance between objects
8. ouvert _ pelouse prairie culture Fa olivier z vigne En zone urbaine route sol nu rivi re s tendue d eau Then the user has to parametrize the configuration table Properties Layers Object Rendering LandUse Fields Select Mesh Texture to each Field LandUse Texture Resolution Density garrique ferme Grassl jpa here to add Meshes Click here to add Meshes Click here to add Meshes Click here to add Meshes Click here to add Meshes Click here to add Meshes Click here to add Meshes Click here to add Meshes Click here to add Meshes L gr LE LE bois Ferm arassa jpg garrigue ouvert Grass3 ipg zone urbaine ae bois ouvert Grassl jpg pelouse Grasse jpg rivitre arassa jpg bendue d eau Grass jpg 10 prairie Grass1 jpg Load Ogre Camera Save Ogre Camera Load Ogre 4nimation Path Each row of this table represents a land use For each land use user can edit geo typical parameters in columns The texture represents typical ground cover This is used to build the texture that is draped over the terrain when rendering Double click on a cell of the Texture column to open a file browser and choose an image file bmp png or jpg format only The resolution of the texture Click on click on a cell of the Resolution column and enter a value This value is the size in meter of a texture pixel The density of 3D object on this land use Click on clic
9. ts change the interval between the keyframes that are created in record mode and the playback speed in playback mode You can also place keyframes manually with the Space key Once the playback started frames are saved on the current directory SLElnstallDirectory bin release in PNG format moviei png where i is the frame number When playback is finished makemovie bat creates automatically the movie file movie mp4
10. ved to the right fog density is increased 9 Modity rain density Slider to modify the rain density When slider is moved to the right rain density is increased Caution the time speed must be gt 0 10 Lighting Power When activated the HDR Hight Dynamic Range rendering is activated http en wikipedia org wiki High_dynamic_range_rendering 11 HDR Velocity Slider to modify the HDR velocity When slider is moved to the right light velocity is increased 12 Compute Compute the terrain light map That is it computes the terrain shadows 13 Render Stereo When activated the stereo rendering 1s enabled 14 Camera Distance Slider to modify the distance between the two cameras When slider is moved to the right the distance is increased 15 Focal Distance Slider to modify the focal When slider is moved to the right focal distance is increased 16 Render Hydro When activated a water plane is added on the scene 17 Z Position Slider to modify the elevation of the water plane 18 X Position Slider to modify the abscise position of the water plane 19 Y Position Slider to modify the ordinate position of the water plane 20 Size of the plane Slider to modify the area of the water plane When slider is moved to the right the pane size is increased f Recording amp playing back camera paths You can start and stop recording the camera by pressing nsert and toggle playback using Return The bracke
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