Overview: Open Inventor

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OverviewOpen Inventor
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Open Inventor

• set of building blocks
• based on OpenGL - uses OpenGL for rendering
• focuses on creating 3D objects
• commonly used to render the objects
• creates a scene graph
• directed, acyclic graph of nodes
• state machine
• some nodes modify state
• object nodes are rendered according to current
  state

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Inventor Objects

• database primitives
• shape
• property
• group
• engine

• manipulators
• handle box
• trackball
• components
• materials
• directional lights

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Hierarchical Traversal
Separator Separator RotationXYZ axis
Z angle 0 ElapsedTime speed
0.4 . Timeout Transform
translation 0 0 0.5 Separator
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The Scene Database
Transformation node
Separator node
Object node
Property node
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Sample Graph
Group
Separator
transform
object
transform
property
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Class Tree
SoBase SoFieldContainer SoNode SoCamera SoShape So
Cube SoEngine SoCalculator
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Etc.
Callback function at node Selection callback
node Event callbacks manipulators
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OSU inventor flattens tree
T1
T12
T1234
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O1
O2
O3
O1
T3
O2
T4
O3