Amazon VERSION 2.0V1 Uživatelská příručka stáhnout pdf (Strana 164)

164

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

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Amazon VERSION 2.0V1 Uživatelská příručka Strana 164