DampedPositionInterpolator
This proto was posted by peter on 2007-08-14.
So far there is 1 comment. Feel free to add one.
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Description
A damped PositionInterpolator which can be used as a drop-in replacement for a standard PositionInterpolator.
It combines a PositionInterpolator, PositionDamper and TimeSensor node.
Interface
| Field name | Value type | Field type | Default value |
|---|---|---|---|
| set_fraction | SFFloat | inputOnly | |
| Selects input key for corresponding keyValue output. | |||
| duration | SFTime | inputOutput | 1.0 |
| The duration of the interpolation (in seconds). | |||
| enabled | SFBool | inputOutput | true |
| Flag to enable/disable the node behaviour | |||
| initialDestination | SFVec3f | inputOutput | 1 1 1 |
| The initial damper destination. | |||
| initialValue | SFVec3f | inputOutput | 1 1 1 |
| The initial damper value. | |||
| key | MFFloat | inputOutput | 0 1 |
| Defines parameters for interpolation function time intervals, in increasing order and corresponding to keyValues. Hint: number of keys must match number of keyValues! | |||
| keyValue | MFVec3f | inputOutput | 0 0 0, 1 1 1 |
| Output values of the interpolation, each corresponding to time-fraction keys. Hint: number of keys must match number of keyValues! | |||
| loop | SFBool | inputOutput | false |
| Specifies if the interpolation is looped. | |||
| startTime | SFTime | inputOutput | 0 |
| Interpolation is started if value is >=now. | |||
| tau | SFTime | inputOutput | 0.2 |
| The field tau specifies the time-constant of the internal filters and thus the speed that the output of an X3DDamperNode responds to the input. | |||
| cycleTime | SFTime | outputOnly | |
| Sends a time output at start time of the interpolation and also at the beginning of each new cycle (useful for synchronization with other time-based objects). | |||
| value_changed | SFVec3f | outputOnly | |
| Interpolated output value determined by current key time and corresponding “keyValue” pair. | |||
Proto code
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE X3D PUBLIC "ISO//Web3D//DTD X3D 3.0//EN" "http://www.web3d.org/specifications/x3d-3.0.dtd">
<X3D xmlns:xsd='http://www.w3.org/2001/XMLSchema-instance' profile='Full' version='3.0' xsd:noNamespaceSchemaLocation='http://www.web3d.org/specifications/x3d-3.0.xsd'>
<Scene DEF='scene'>
<ProtoDeclare name='DampedPositionInterpolator' component='pyjax' documentation='A damped PositionInterpolator which can be used as a drop-in replacement for a standard PositionInterpolator. It combines a PositionInterpolator, PositionDamper and TimeSensor node.'>
<ProtoInterface>
<field name='key' type='MFFloat' accessType='inputOutput' value='0 1'
documentation='Defines parameters for interpolation function time intervals, in increasing order and corresponding to keyValues. Hint: number of keys must match number of keyValues!' />
<field name='keyValue' type='MFVec3f' accessType='inputOutput' value='0 0 0, 1 1 1'
documentation='Output values of the interpolation, each corresponding to time-fraction keys. Hint: number of keys must match number of keyValues!' />
<field name='enabled' type='SFBool' accessType='inputOutput' value='true'
documentation='Flag to enable/disable the node behaviour'/>
<field name='value_changed' type='SFVec3f' accessType='outputOnly'
documentation='Interpolated output value determined by current key time and corresponding "keyValue" pair.'/>
<field name='set_fraction' type='SFFloat' accessType='inputOnly'
documentation='Selects input key for corresponding keyValue output.'/>
<field name='tau' type='SFTime' accessType='inputOutput' value='0.2'
documentation='The field tau specifies the time-constant of the internal filters and thus the speed that the output of an X3DDamperNode responds to the input.' />
<field name='initialValue' type='SFVec3f' accessType='inputOutput' value='1 1 1'
documentation='The initial damper value.'/>
<field name='initialDestination' type='SFVec3f' accessType='inputOutput' value='1 1 1'
documentation='The initial damper destination.'/>
<field name='duration' type='SFTime' accessType='inputOutput' value='1.0'
documentation='The duration of the interpolation (in seconds).' />
<field name='startTime' type='SFTime' accessType='inputOutput' value='0'
documentation='Interpolation is started if value is >=now. '/>
<field name='loop' type='SFBool' accessType='inputOutput' value='false'
documentation='Specifies if the interpolation is looped.'/>
<field name='cycleTime' type='SFTime' accessType='outputOnly'
documentation='Sends a time output at start time of the interpolation and also at the beginning of each new cycle (useful for synchronization with other time-based objects).'/>
</ProtoInterface>
<ProtoBody>
<Group>
<PositionInterpolator DEF='posInterpol'>
<IS>
<connect protoField='key' nodeField='key'/>
<connect protoField='keyValue' nodeField='keyValue'/>
<connect protoField='enabled' nodeField='enabled'/>
<connect protoField='set_fraction' nodeField='set_fraction'/>
</IS>
</PositionInterpolator>
<PositionDamper DEF='damper'>
<IS>
<connect protoField='tau' nodeField='tau'/>
<connect protoField='initialValue' nodeField='initialValue'/>
<connect protoField='initialDestination' nodeField='initialDestination'/>
<connect protoField='enabled' nodeField='enabled'/>
<connect protoField='value_changed' nodeField='value_changed'/>
</IS>
</PositionDamper>
<TimeSensor DEF='ts'>
<IS>
<connect protoField='startTime' nodeField='startTime'/>
<connect protoField='duration' nodeField='cycleInterval'/>
<connect protoField='loop' nodeField='loop'/>
<connect protoField='cycleTime' nodeField='cycleTime'/>
</IS>
</TimeSensor>
<ROUTE fromNode='ts' fromField='fraction_changed' toNode='posInterpol' toField='set_fraction' />
<ROUTE fromNode='posInterpol' fromField='value_changed' toNode='damper' toField='set_destination' />
</Group>
</ProtoBody>
</ProtoDeclare>
</Scene>
</X3D>
Test code
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE X3D PUBLIC "ISO//Web3D//DTD X3D 3.0//EN" "http://www.web3d.org/specifications/x3d-3.0.dtd">
<X3D xmlns:xsd='http://www.w3.org/2001/XMLSchema-instance' profile='Full' version='3.0' xsd:noNamespaceSchemaLocation='http://www.web3d.org/specifications/x3d-3.0.xsd'>
<Scene DEF='scene'>
<ExternProtoDeclare name='DampedPositionInterpolator' url='DampedPositionInterpolator_PROTO.x3d' />
<!-- A simple test for the DampedPositionInterpolator.
It animates a box from left to right. Note the "smoothness" of the animation due
to the damper.
-->
<Viewpoint position='0.5 0 2' />
<DampedPositionInterpolator DEF='dampedPosInterpol' loop='true' key='0 0.5 1' keyValue='0 0 0, 1 0 0, 0 0 0' />
<Transform DEF='boxTrans'>
<Shape>
<Box size='.1 .1 .1' containerField='geometry' />
</Shape>
</Transform>
<ROUTE fromNode='dampedPosInterpol' fromField='value_changed' toNode='boxTrans' toField='translation' />
</Scene>
</X3D>
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