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Maya

Maya. Programming Interface Overview. Programming Interfaces. MEL - Maya Embedded Language Scripting language Interpreted Fast prototyping, slow execuation C++ Powerful, fast Class libraries. Maya Architecture. Dependency Graph (DG). Data flow model

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Maya

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  1. Maya Programming Interface 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. The Scene • 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

  23. Animation Expressions – expression editor Baking simulations Record out put of expressions Makes each frame a single frame Connecting attributes • Handling complexity • Layers • Groups • Reference & proxy files CIS682

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