Chapter 6 - The Scene Graph
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1 Chapter 6 - The Scene Graph Why a scene graph? What is stored in the scene graph? objects appearance camera lights Rendering with a scene graph Practical example 1
2 The 3D Rendering Pipeline (our version for this class) 3D models in model coordinates 3D models in world coordinates 2D Polygons in camera coordinates Pixels in image coordinates Scene graph Camera Rasterization Animation, Interaction Lights 2
3 Why a Scene Graph? Naive approach: for each object in the scene, set its transformation by a single matrix (i.e., a tree 1 level deep and N nodes wide) advantage: very fast for rendering disadvantage: if several objects move, all of their transforms change Observation: Things in the world are made from parts Approach: define an object hierarchy along the part-of relation transform all parts only relative to the whole group transform group as a whole with another transform parts can be groups again 3
4 Chapter 6 - The Scene Graph Why a scene graph? What is stored in the scene graph? objects appearance camera lights Rendering with a scene graph Practical example 4
5 Geometry in the Scene Graph Leaves are basic 3D objects (polygon meshes, primitives,...) Welt Non-leaf nodes (groups) contain a transformation can have one or several children transformation is given by a homogeneous Matrix Auto TAuto Root is the entire world TKarosserie Karosserie Räder TRäder Nodes can be the child of several groups not a tree, but a directed acyclic graph (DAG) TChassis Chassis Quader1 Kabine grau Quader2 TKabine Rad1 Rad2 Rad3 Rad4 Rad effective reuse of geometry Felge Reifen Zylinder1 weiß Zylinder2 schwarz 5
6 Appearance in the Scene Graph Scene graph also contains appearances Appearance: E.g. Color, reflection, transparency, texture Details see next lecture can be reused similarly to geometry Auto Appearance can be only partially specified Karosserie Räder unspecified values are inherited Chassis Kabine grau Rad1 Rad2 Rad3 Rad4 Quader1 Quader2 Rad Felge Reifen Zylinder1 weiß Zylinder2 schwarz 6
7 Lights in the Scene Graph Light sources also need a position and/or direction Welt Just include them into the scene graph Can be animated just like geometry Auto Sonne Licht1 Lights can be in local coordinate systems of geometry groups Karosserie Räder move with them Chassis Kabine grau Rad1 Rad2 Rad3 Rad4 example: headlamps on a car Quader1 Quader2 Rad Felge Reifen Zylinder1 weiß Zylinder2 schwarz 7
8 The Camera in the Scene Graph Camera also needs a position and direction Just include it into the scene graph Welt Can be animated just like geometry Kamera Sonne Auto Camera can be in local coordinate systems of geometry groups Kamera1 Karosserie Räder Licht1 move with them example: driver s view from a car Chassis Kabine grau Rad1 Rad2 Rad3 Rad4 Quader1 Quader2 Rad Felge Reifen Zylinder1 weiß Zylinder2 schwarz 8
9 Chapter 6 - The Scene Graph Why a scene graph? What is stored in the scene graph? objects appearance camera lights Rendering with a scene graph Practical example 9
10 Scene graph traversal for rendering set Tact to TAuto push state Auto set Tact to Tact x TKarosserie push state Karosserie Räder set Tact to Tact x TChassis render Quader1 Chassis Kabine grau Rad1 Rad2 Rad3 Rad4 pop state set Tact to Tact x TKabine render Quader2 Quader1 Quader2 Rad pop state pop state Felge Reifen set Tact to Tact x TRäder... Zylinder1 weiß Zylinder2 schwarz 10
11 Scene Graph Libraries Scene graphs exist on a more abstract layer than OpenGL! VRML/X3D descriptive text format, ISO standard OpenInventor based on C++ and OpenGL originally Silicon Graphics, 1988 now supported by VSG3d.com Java3D provides 3D data structures in Java not supported anymore Open Scene Graph (OSG) Various Game Engines e.g. JMonkey 3 (scene graph based game engine for Java) 11
12 Scene Graphs in Practice Creation of scene graphs and objects Specific authoring software (e.g. Blender, Maya, 3DS Max) Assets (models, objects) exported to exchange formats E.g. (X3D,) Wavefront OBJ (.obj), 3ds Max (.3ds), Ogre XML (.mesh) Objects typically are tesselated Polygon meshes No primitive geometric objects visible/readable anymore Example: JME Scene 12
13 Chapter 6 - The Scene Graph Why a scene graph? What is stored in the scene graph? objects appearance camera lights Rendering with a scene graph Practical example 13
14 Example of a scene graph Graph to be drawn together in the lecture VRML world linked from the class page 14
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