Changes between Version 6 and Version 7 of visual_object

Timestamp:

Apr 10, 2010, 12:29:22 PM (15 years ago)

Author:

Torben Dannhauer

Comment:

--

visual_object

@@ -9 +9 @@
 The module "visual_object" allows to manage objects in the scene, with fixed or dynamic position. An visual_object can be positioned in latitude, longitude and altitude, as well in rotations along all three axis.
 The object itself is not visible, it only provides the functions for managing the object. By adding text labels or geometries, it is visible in the scene.
+
+If you want to specialize visual_object for more specifiy usage, subclass visual_object and add your new convenient values and calculations, e.g.:
+ * visual_aircraft
+  * Add gear : extraction_value
+  * Add light : navigationlight_value
+  * Add propeller rpm : prop_rpm_value
 
 == Overview Convenience Functions ==
@@ -21 +27 @@
  * setting camera translation offset (used by node attached camera manipulator)
  * setting camera rotation offset (used by node attached camera manipulator)
- * adding/removing object_updater      (see xx for further information)
- * adding/removing label      (see [http://www.osgvisual.org/projects/osgvisual/wiki/visual_object#Objectlabels Object labels] for further information)
+ * adding/removing object_updater      (see [http://www.osgvisual.org/projects/osgvisual/wiki/visual_object#Objectupdater object updater] for further information)
+ * adding/removing label      (see [http://www.osgvisual.org/projects/osgvisual/wiki/visual_object#Objectlabels object labels] for further information)
 
 == Technical Implementation ==
 
-This description does not replace the dive into the sourceode, it should give you only a short overview how it works.
-Please read the doxygen documentation as reference for all function calls: http://www.osgvisual.org/notyetpublished
+This description does not replace the dive into the source code, it should give you only a short overview how it works.
+Please read the doxygen documentation of all function calls: http://www.osgvisual.org/notyetpublished
 
+Basically, a visual_object is a subclass of  a simple Matrixtransform which has the geometry as child node.
+Additionally it contains variables and their setters/getter for all specified convenient functions.
 
-Basically, a visual_object is a simple Matrixtransform which has the geometry as childnode.
+The Matrixtransform has several child which are matrixes or drawables to provide the functionality:
+<Insert Image of visual Objects architecture>
+
+The core functionality is an update callback (installed on the visual_object class by its initializer), which transforms the specified object properties to the corresponding matrices:
+ * lat/lon/alt via OSG'S ellipsoid model and its computeLocalToWorld() to the objects transform matrix.
+ * scale values to the scaling matrix.
+ * camera values to the camera matrix.
+ * geometry offset values to the object matrix.
+
+The object updater and label functions are not updated every frame by the callback, it just invokes their own udpdate functions.