Post

CoordinateInterpolator

Posted Updated
By CREATE3000
2 min read

Overview

CoordinateInterpolator linearly interpolates among a list of 3-tuple MFVec3f arrays, producing a single MFVec3f array that is fractional average between two nearest arrays in the list. Authors can ROUTE value_changed output events (an array of 3-tuple SFVec3f values) to a Coordinate node’s point field, or to another MFVec3f field.

The CoordinateInterpolator node belongs to the Interpolation component and requires at least level 1, its default container field is children. It is available since VRML 2.0 and from X3D version 3.0 or higher.

Hierarchy

1
2
3
4

+ X3DNode
  + X3DChildNode
    + X3DInterpolatorNode
      + CoordinateInterpolator

Fields

SFNode [in, out] metadata NULL [X3DMetadataObject]

Information about this node can be contained in a MetadataBoolean, MetadataDouble, MetadataFloat, MetadataInteger, MetadataString or MetadataSet node.

Hint

SFFloat [in] set_fraction (-∞,∞)

set_fraction selects input key for corresponding keyValue output.

Hint

  • set_fraction values are typically in same range interval as values in the key array. Response to an input set_fraction value less than minimum is equivalent to minimum key, and response to an input set_fraction value greater than maximum is equivalent to maximum key.

Warning

  • It is an error to define this transient inputOnly field in an X3D file, instead only use it a destination for ROUTE events.

MFFloat [in, out] key [ ] (-∞,∞)

Definition values for linear-interpolation function input intervals, listed in non-decreasing order and corresponding to a value in the keyValue array.

Hints

  • Number of keyValues must be an integer multiple of the number of keys!
  • KeyValue/key integer multiple defines how many coordinates are sent in value_changed outputOnlys.
  • Typical interval for values in key array is within range of 0 to 1, but larger intervals can be defined with arbitrary bounds.

Warning

  • Values in key array shall be monotonically non-decreasing, meaning that each value is greater than or equal to the preceding value.

MFVec3f [in, out] keyValue [ ] (-∞,∞)

Output values for linear interpolation, each corresponding to an input-fraction value in the key array.

Hints

MFVec3f [out] value_changed

Linearly interpolated output value determined by current key time and corresponding keyValue pair.

Hints

  • X3D players might not send unchanging intermediate values, thus avoiding excessive superfluous events that have no effect.
  • KeyValue/key integer multiple defines how many coordinates are sent in value_changed outputOnlys.

Warning

  • It is an error to define this transient outputOnly field in an X3D file, instead only use it a source for ROUTE events.

Advice

Hints

  • Typical input connection is ROUTE someTimeSensorDEF.fraction_changed TO thisInterpolatorDEF.set_fraction.
  • Typical output connection is ROUTE thisInterpolatorDEF.value_changed TO someDestinationNodeDEF.set_someAttribute.
  • Example scenes and authoring assets

Example

See Also

Interpolation

components, Interpolation
CoordinateInterpolator Interpolation
This post is licensed under CC BY 4.0 by the author.