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A Group Node Example
The following stand alone example produces a group node containing a network that produces a Scene Graph with
sphere and cube locations. It uses only Nodegraph API calls covered by this chapter. There is no access to the
generated Scene Graph from outside of the group node.
# Constants
TIME = 0
HALF_DISTANCE_APART = 1.0
# Create the group at root level
root = NodegraphAPI.GetRootNode()
group = NodegraphAPI.CreateNode('Group', root)
# Create the sphere at group level
sphere = NodegraphAPI.CreateNode('PrimitiveCreate', group)
sphere.setName( 'Sphere' )
sphere.getParameter( 'name' )\
.setValue( "/root/world/geo/sphere", TIME )
# Set the type to sphere
sphere.getParameter( 'type' ).setValue( 'sphere', TIME )
sphere.getParameter( 'transform.translate.x' ).\
setValue( HALF_DISTANCE_APART, TIME )
NodegraphAPI.SetNodePosition(sphere, ( -100, 100 ) )
# Create the cube
cube = NodegraphAPI.CreateNode( 'PrimitiveCreate', group )
cube.setName( 'Cube' )
cube.getParameter( 'name' ).\
setValue( "/root/world/geo/cube", TIME )
# Set the type to cube
cube.getParameter( 'type' ).setValue( 'cube', TIME )
cube.getParameter( 'transform.translate.x' ).\
setValue( - HALF_DISTANCE_APART, TIME )
NodegraphAPI.SetNodePosition( cube, ( 100, 100 ) )
# Create a Merge node at group level
merge = NodegraphAPI.CreateNode( 'Merge', group )
# Connect the two PrimitiveCreate nodes to a Merge node
mergeSphere = merge.addInputPort( 'sphere' )
mergecube = merge.addInputPort( 'cube' )
mergeSphere.connect( sphere.getOutputPort( 'out' ) )
mergecube.connect(cube.getOutputPort( 'out' ) )
# Rename our merge node to 'Result' to make it clear that
# this is the final result.
23 NODEGRAPH API | GROUP NODES
- 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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