Process SMIL directives in XML data

Process SMIL directives in XML data is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.

One very common task in OpenGL is to load data from a file that contains geometry. These data most often also contain additional informations, for example animation informations. In this task we propose to load X3D geometric data with additional Smil animation statments. X3D is not particularly supposed to be mixed with Smil, but Smil is supposed to be mixable with any XML format.

• X3D: on Wikipedia / SPECS of the XML form / Examples
• Smil: on Wikipedia / SPECS / Examples

Here is the pure X3D base of our file containing only geometry:

<lang xml><?xml version="1.0" ?> <X3D>

 <Scene>
   <Viewpoint position="0 0 8" orientation="0 0 1 0"/>
   <PointLight color='1 1 1' location='0 2 0'/>
   <Transform translation='0.0 0.0 0.0' scale='1 1 1'>
     <Shape>
       <Box size='2 1 2'/>
       <Appearance>
         <Material diffuseColor='0.0 0.6 1.0'/>
       </Appearance>
     </Shape>
   </Transform>
 </Scene>

</X3D></lang>

And here is the same data with additional Smil statments that you should load, display and animate with OpenGL (or something else):

<lang xml><?xml version="1.0" ?> <smil> <X3D>

 <Scene>
   <Viewpoint position="0 0 8" orientation="0 0 1 0"/>
   <PointLight color='1 1 1' location='0 2 0'/>
   <Transform translation='0.0 0.0 0.0' scale='1 1 1'>
     <Shape>
       <Box size='2 1 2'>
         <animate attributeName="size" from="2 1 2"
                                         to="1 2 1" begin="0s" dur="10s"/>
       </Box>
       <Appearance>
         <Material diffuseColor='0.0 0.6 1.0'>
           <animate attributeName="diffuseColor" from="0.0 0.6 1.0"
                                                   to="1.0 0.4 0.0" begin="0s" dur="10s"/>
         </Material>
       </Appearance>
     </Shape>
   </Transform>
 </Scene>

</X3D></smil></lang>

Try to make it possible to insert "animate" tags for animating every attribute of the base file.

In the example file, there is only a <Box> primitive, try to implement the primitives below too: <lang xml> <Sphere radius="1"/>

 <Cylinder radius="1" height="2"/>
 <Cone bottomRadius="1" height="2"/></lang>

If you are in shape, try to implement the <seq> tag too (def, ex.), we could for example put successivelly a Box, a Sphere, a Cone into it.

For this task the more important is to focus on the data structure with inserted timelines.

Warnings:

• this task is a draft, you can modify it if you find a way to enhance it,
• the coordinates in the X3D data are perhaps not relavant, for example the box is maybe not positioned in front of the viewpoint, please fix this if you can.

OCaml

See Loading Animated 3D Data/OCaml