Tutorial on usage of cameras to transform geometries registered
in a display. This applet shows a 4d cube in the 3-sphere. The cube is projected either
parallel by removing the fourth coordinate, or by stereographic projection from
the projection center (1,0,0,0).
Inside the camera menu enable transformation of the currently selected geometry.
Depending on the chosen space form the geometry is transformed
in its own coordinate system. E.g. translation in S3 moves the geometry along a
great arc in S3. As an exception, also in R3 and R4 the geometry is transformed
individually but with respect to the global coordinate system of the camera. This
keeps the space ball like transformation of geometries as in camera mode.
In a scene with different models, the currently selected
model is transformed.
View source code:
PaTransform.java of applet,
PjTransform.java of project,
PjTransform_IP.java of project panel.
