The PAEPOS system developed for the Santa Clara Logo animation had a structure as shown below:
<paepos>
<defs>
<def>
<defname>aero</defname>
<symbol><name>wing</name>
<part><path>M0,0,-0.75L4,0,-0.75....</path>..<path>...</part>
</symbol>
</def>
</defs>
<composition>
<duration>6</duration> <intervals>16</intervals>
</composition>
<viewing>
<object>aero</object>
<animate>
<over><from>5</from><to>35</to></over>
</animate>
</viewing>
<object>
<animate><rotateyz><y>4</y><z>2.7</z><ang><from>1080</from><to>0</to></ang></rotateyz></animate>
<part>
<name>rightfus</name>
<use><def>aero</def><symbol>fus</symbol></use>
<size><xref>0</xref><yref>0</yref><xmag>-1</xmag><ymag>1</ymag></size>
</part>
<object>
</paepos>
A set of definitions at the head of the file define the objects to be used in the system. These were augmented by the set of basic shapes in the original CAMPER system. The composition section gave some overall information about the scene to be animated. The viewing section defines the perspective view to be used and finally the last section defines the scene made out of the objects previously defined. Animation or static pictures can be defined. The static element just has the transformations to apply while the animate element indicates the start and end values for the animation.
Our later Path_ology3D system has a similar structure but uses more attributes and less elements to make the file a lot smaller.
Below is the original CAMPER aeroplane recreated in the PAEPOS system.
Figure 3.1: CAMPER Aeroplane recreated in PAEPOS