Post

GeoLocation

Posted Updated
By CREATE3000 3 min read

Overview

GeoLocation positions a regular X3D model onto earth’s surface. GeoLocation can contain children and GeoOrigin nodes.

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

Hierarchy

1
2
3
4

+ X3DNode
  + X3DChildNode
    + X3DGroupingNode
      + GeoLocation

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

SFNode [ ] geoOrigin NULL [GeoOrigin] (deprecated)

Single contained GeoOrigin node that can specify a local coordinate frame for extended precision.

Hint

Warning

  • XML validation requires placement as first child node following contained metadata nodes (if any).

MFString [ ] geoSystem [ “GD”, “WE” ]

Identifies spatial reference frame: Geodetic (GD), Geocentric (GC), Universal Transverse Mercator (UTM). Supported values: “GD” “UTM” or “GC” followed by additional quoted string parameters as appropriate for the type.

Hints

Warning

  • Deprecated values are GDC (replaced by GD) and GCC (replaced by GC).

SFVec3d [in, out] geoCoords 0 0 0 (-∞,∞)

Geographic location (specified in current geoSystem coordinates) for children geometry (specified in relative coordinate system, in meters).

Hint

Warning

  • Requires X3D profile='Full' or else include <component name='Geospatial' level='1'/>

SFBool [in, out] visible TRUE

Whether or not renderable content within this node is visually displayed.

Hints

  • The visible field has no effect on animation behaviors, event passing or other non-visual characteristics.
  • Content must be visible to be collidable and to be pickable.

SFBool [in, out] bboxDisplay FALSE

Whether to display bounding box for associated geometry, aligned with world coordinates.

Hint

  • The bounding box is displayed regardless of whether contained content is visible.

SFVec3f [ ] bboxSize -1 -1 -1 [0,∞) or −1 −1 −1

Bounding box size is usually omitted, and can easily be calculated automatically by an X3D player at scene-loading time with minimal computational cost. Bounding box size can also be defined as an optional authoring hint that suggests an optimization or constraint.

Hints

SFVec3f [ ] bboxCenter 0 0 0 (-∞,∞)

Bounding box center accompanies bboxSize and provides an optional hint for bounding box position offset from origin of local coordinate system.

Hints

MFNode [in] addChildren

Input field addChildren.

MFNode [in] removeChildren

Input field removeChildren.

MFNode [in, out] children [ ] [X3DChildNode]

Grouping nodes contain an ordered list of children nodes.

Hints

  • Each grouping node defines a coordinate space for its children, relative to the coordinate space of its parent node. Thus transformations accumulate down the scene graph hierarchy.
  • InputOnly MFNode addChildren field can append new X3DChildNode nodes via a ROUTE connection, duplicate input nodes (i.e. matching DEF, USE values) are ignored.
  • InputOnly MFNode removeChildren field can remove nodes from the children list, unrecognized input nodes (i.e. nonmatching DEF, USE values) are ignored.
  • X3D Architecture 10.2.1 Grouping and children node types

Advice

Hints

  • X3D for Advanced Modeling (X3D4AM) slideset
  • GeoLocation adjusts orientation of children models appropriately: +Y axis is up direction for that local area (i.e. normal to tangent plane on the geospatial ellipsoid), -Z axis points towards north pole, and +X axis points east.

Warnings

  • Requires X3D profile='Full' or else include <component name='Geospatial' level='1'/>
  • Avoid having GeoLocation or GeoTransform as a parent or ancestor node of each other, since multiple geospatial transformations then occur with unpredictable results.

See Also

Geospatial

components, Geospatial
GeoLocation Geospatial
This post is licensed under CC BY 4.0 by the author.