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Overview of Maya's Internal Architecture: Interfaces, Dependency Graph, and Data Flow

This document provides a comprehensive overview of Maya's internal structure, focusing on key components such as programming interfaces, the Dependency Graph (DG), and the data flow model. It discusses the importance of MEL (Maya Embedded Language) for scripting, the role of C++ for performance, and how nodes and attributes function within the DG. Users will learn about connecting attributes, the significance of DAG (Directed Acyclic Graph) nodes, and how transforms affect shapes. Gain insights into building custom attributes and utilizing the pipeline for 3D graphics operations.

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Overview of Maya's Internal Architecture: Interfaces, Dependency Graph, and Data Flow

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  1. Maya Internal Structure Overview CIS682

  2. Programming Interfaces • MEL - Maya Embedded Language • Scripting language • Interpreted • Fast prototyping, slow execuation • C++ • Powerful, fast • Class libraries CIS682

  3. Maya Architecture CIS682

  4. Dependency Graph (DG) • Data flow model • Data manipulated by series of operations • Pipeline • Push-pull model • DG - heart of Maya • Data and operations represented as nodes • Network of nodes to perform task • Add functionality by defining new node CIS682

  5. DG • Entire 3D graphics state - the DG • Models • Animations • Textures • Lights • cameras • Programming interfaces hide much of DG complexity CIS682

  6. Data Flow • Nodes • Attributes - properties of a node • Input/output • Compute function time nurbsSphere1 NurbsSphere1_translateX CIS682

  7. NODE node input output Compute() CIS682

  8. Node attributes node pointA (compound) node x (float) size(float) y (float) z (float) CIS682

  9. Node node points (array) [0] point compound x (float) y (float) z (float) [1] point compound x (float) y (float) z (float) […] point compound CIS682

  10. Node Custom attributes can be added e.g., mass, velocity Window->Attribute editor Attributes->Add Attributes CIS682

  11. Connecting attributes Window->General Editors->Connection editor OR MEL: connectAttr sphere.tx cone.ty Driven keys as explained by technical group CIS682

  12. Compute Function • Output = compute(input0, …, inputN) • Input and output attributes are LOCAL • Black box • Interface: input and output attributes CIS682

  13. Dependent Attributes • Volume = compute(sphereSize) • attributeAffects( sphereSize, volume) sphereVolume sphereSize (float) volume (float) CIS682

  14. Time • Example of node that only holds data • Current time in time node named time1 • Moving frame slider or click on Play sets time time outTime (time) CIS682

  15. Connecting Nodes • Connect nodes by connecting node attributes • Attribute can only connect to attribute of same type • Maya handles flow of data; node not ‘aware’ of connections • Connections: one-to-many mappings • When connections broken, node retains value CIS682

  16. DAG nodes • Directed Acyclic Graph • DAG nodes form Shape-Transform hierarchy • DAG nodes are in DG - they are DG nodes • Some DAG nodes connect to non-DAG DG nodes • Some DAG nodes may not be connected to any non-DAG nodes • Maya shows either DAG hierarchy or connected DG nodes, not both simultaneously CIS682

  17. transform time animCurve shape DAG and DG nodes transform CIS682

  18. Shape Nodes • Meshes • NURBS curves and surfaces • Springs • Camera • Lights • Particles • Etc. CIS682

  19. Transform Nodes • Shape node can’t exist without a transform node • Shape node holds the data • Transform node transforms from objects space to world space nurbsSphere2 nurbsSphereShape2 CIS682

  20. boxMetrics width (float) height (float) depth (float) areaOfTop (float) volume (float) Dependent Attributes • attributeAffects( width, areaOfTop) • attributeAffects( depth, areaOfTop) • attributeAffects( areaOfTop, volume) • attributeAffects( height, volume) dependent CIS682

  21. Transform Hierarchy CIS682

  22. headShape head torso leftArm rightArm leftArm rightArm rightArmShape rightArmShape torsoShape leftArmShape leftArmShape Node Hierarchy CIS682

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