Process SMIL directives in XML data

From Rosetta Code
Revision as of 21:55, 12 July 2011 by rosettacode>Markhobley (wordliness)
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.

OpenGL commonly requires the facility to be able to obtain geometric data and supplementary information, such as animation data, from a file. The task is to obtain data from a given file and place into appropriately organized X3D data structures. The Smil animation statements found within the file should be stored in an XML record, because X3D data structures are not supposed to contain Smil data.

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>

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.

It should be possible to insert "animate" tags against every attribute of the base file and it is important to be able to insert timelines into the data structure.

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 not important. For example, the provided box data may not be positioned centrally to the viewpoint, Please fix this if you can.


OCaml

See Loading animated 3D data/OCaml

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