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It is possible to write an expression that will reference a node by name and not break when the node name changes,
see Appendix B: Expressions In the Katana User Guide for more information and a list of what functions are available
to an expression.
NOTE: you should avoid using the nodeName variable for parameter expressions that specify scene graph
locations, and must take care when using them anywhere that a scenegraph attribute is set. Node names
are not namespaced and can therefore change unpredictably.
The following example script sets the expression on a parameter:
# Add a PrimitiveCreate node
root = NodegraphAPI.GetRootNode()
primitive = NodegraphAPI.CreateNode( 'PrimitiveCreate', root )
# Add a User Parameter of type Number, called myNumber
rootParam = primitive.getParameters()
rootParam.createChildNumber( "myNumber", 7.0 )
# Link myNumber to the node's scale x parameter by expression
scaleX = NodegraphAPI.GetNode( 'PrimitiveCreate' )\
.getParameter( 'transform.scale.x' )
scaleX.setExpression( "getParam( 'PrimitiveCreate.myNumber' )" )
You can disable an expression with the setExpressionFlag() method.
yourExpression.setExpressionFlag( False ) # Disable
yourExpression.setExpressionFlag( True ) # Enable
CEL
Parameters that contain CEL expressions are set like any other string parameter only the value of the parameter is
evaluated to a CEL expression. For example create a CEL expression on a CollectionCreate node that sets to the
/root/geo location:
TIME = 0
root = NodegraphAPI.GetRootNode()
collection = NodegraphAPI.CreateNode( 'CollectionCreate',\
root)
c = collection.getParameter( 'CEL' )
c.setValue( "( (/root/geo) )", TIME )
For more on CEL, and collections using CEL, see the Collections & CEL chapter in the Katana User Guide.
23 NODEGRAPH API | CEL
- TECHNICAL GUIDE 1
- Contents 3
- 9 Porting Plug-ins 4
- 11 Look Files 5
- Appendix B: Other APIs 11
- 28 Render Farm API 11
- Appendix C: Glossary 12
- 1 Preface 13
- 2 Katana For The Impatient 14
- A Short History of Katana 15
- Scene Graph Iterators 16
- The Katana User Interface 16
- Technical Docs and Examples 17
- 3 Custom Render Resolutions 18
- Using the Python API 19
- 4 Custom Node Colors 21
- Editing Rules 22
- Editing Flavors 22
- Updating Node Colors 23
- Making Updates Persist 24
- Flavor API 25
- 5 Message Logging 29
- Custom Logger 30
- Logging Exceptions 31
- 6 Katana Launch Modes 32
- Batch Mode 33
- Script Mode 40
- Shell Mode 40
- Querying Launch Mode 41
- 7 Scene Attributes and 42
- Hierarchy 42
- Common Attributes 43
- Generating Scene Graph Data 44
- Collections and CEL 45
- CEL In the User Interface 46
- Guidelines for Using CEL 46
- Avoid Using Deep Collections 47
- Paths Versus Rules 48
- 8 Scene Graph Generator Plug 49
- Running an SGG Plug-in 50
- ScenegraphGeneratorResolve 51
- SGG Plug-in API Classes 53
- ScenegraphGenerator 54
- Constructor 55
- Destructor 55
- Static Methods 55
- Instance Methods 57
- Registering an SGG Plug-in 58
- ScenegraphContext 59
- Providing Error Feedback 64
- Source Locations 70
- Additional Build-ins 70
- FAQ for Plug-in Porting 71
- Bounding Boxes and Good Data 74
- Proxies and Good Data 74
- Level of Detail Groups 75
- ScenegraphXML 77
- Look File Baking 79
- Other Uses For Look Files 79
- How Look Files Work 80
- Collections Using Look Files 81
- Look File Globals 82
- The Look File Manager 82
- 12 User Parameters and Widget 83
- Widget Availability 91
- 13 Groups, Macros, and Super 93
- Adding User Parameters 94
- Conditional Behavior 96
- Super Tools 99
- Examples 103
- 14 Resolvers 105
- Examples of Resolvers 106
- Implicit Resolvers 106
- Creating Your Own Resolvers 107
- 15 Wrapping SGG Plug-Ins in a 109
- Custom Node 109
- Creating A Custom Node 110
- What Is A Node? 111
- Defining Your Node Class 111
- Declaring the Node Shell 112
- Registering with NodegraphAPI 112
- Defining the User Interface 112
- Specifying UI Hints 113
- Calling the SGG Plug-in 114
- Installing Your Node 116
- 16 Creating New Importomatic 117
- Creating a Tree Structure 121
- Updating the Node Graph 122
- Registering the GUI 123
- 17 Handling Textures 125
- Using Primvars In RenderMan 128
- Using Custom User Data 128
- Metadata on Imported Geometry 129
- Metadata From Another Source 129
- 18 Typed Connection Checking 131
- Shader Inputs 132
- ( ', ' ) 133
- 19 Universal Attributes 134
- Default Attributes 135
- Reading Default Parameters 136
- 20 Args Files in Shaders 138
- Edit Main Shader Description 140
- Export Args File 140
- Widget Types 140
- Widget Options 143
- Conditional Locking Options 144
- Editing Help Text 144
- Co-Shaders 145
- Co-Shader Pairing 145
- Example Args File 146
- Usage in Python Nodes 149
- Usage in C++ Nodes 150
- 21 Locations and Attributes 152
- Light Linking 153
- 22 PRMan Technical Notes 155
- Oi = Os; 156
- 22 PRMAN TECHNICAL NOTES 156
- 23 Nodegraph API 157
- Referencing a Node 158
- Referencing a Parameter 158
- Node Position 158
- Node Naming 159
- Input and Output Ports 160
- Duplicating Nodes 161
- Deserialize 162
- Printing An XML Tree 162
- Group Nodes 163
- A Group Node Example 164
- Send and Return Ports 165
- Return Port Example 165
- Send Port Example 166
- Physical Connection 167
- Logical Connection 167
- Physical and Logical Source 168
- Logical Source 169
- User Parameters 170
- Top Level User Parameters 171
- Nested User Parameters 171
- Parameter Hints 171
- Parameter Expressions 172
- Enableable Parameter Groups 174
- 24 Op API 176
- The OpTree 177
- Core Concepts with Geolib3 178
- The Op API Explained 181
- The Cook Interface 182
- Op Arguments 182
- Scene Graph Creation 184
- The setAttr() Function 185
- The createChild() Function 185
- The execOp() Function 186
- The deleteSelf() Function 187
- Reading Scene Graph Input 188
- The getAttr() Function 189
- The prefetch() Function 190
- CEL and Utilities 191
- Integrating Custom Ops 192
- The NodeTypeBuilder Class 193
- Op Toolchain 193
- Client Configuration 194
- Advanced Topics 195
- Op Best Practices Cheat Sheet 196
- 25 NodeTypeBuilder 198
- Examples of NodeBuilderType 199
- 26 Creating a GenericAssign 201
- 27 Asset Management System 204
- Plug-in API 204
- Asset Fields 205
- Asset Attributes 205
- Asset Publishing 205
- Transactions 205
- Creating an Asset Plug-in 206
- Publishing an Asset 207
- Asset Types and Contexts 209
- Accessing an Asset 210
- Additional Methods 210
- Top Level Asset API Functions 214
- LiveGroup Asset Functions 214
- Delegate 215
- Configuring the Asset Browser 216
- The Asset Control Widget 217
- Asset Render Widget 218
- The C++ API 220
- Farm Menu Options 222
- Farm Node Parameters 223
- Get Sorted Dependency List 224
- Render Dependencies 225
- Render Passes and Outputs 226
- File Browser Example 227
- Custom Dialog 228
- Additional Utils 229
- Appendix A: Custom Katana 231
- Attribute Modifiers 232
- Viewer Manipulator API 234
- Viewer Modifier API 234
- Viewer Proxy Loader API 234
- Renderer API 234
- Key Locations 237
- Location Type Conventions 241
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