[x3d-public] JSON Encoding

[Cecile Muller]

Good evening,


Let's take this example from the mailing-list:

{ "Shape":
{
"-content": [
{ "#comment":"Sphere begin"},
{ "Sphere":
{
}
},
{ "#comment":"Sphere complete, Appearance begin"},
{ "Appearance":
{
"-content": [
{ "#comment":"Material begin"},
{ "Material":
{
"@DEF":"MaterialLightBlue",
"@diffuseColor":[0.1,0.5,1]
}
},
{ "#comment":"Material complete, ImageTexture begin"},
{ "ImageTexture":
{
"@DEF":"ImageCloudlessEarth",
"@url":["earth-topo.png”]
}
},
{ "#comment":"ImageTexture complete"}
]
}
},
{ "#comment":"Appearance complete"}
]
}
}

Given a reference "data" to the root of the structure, you would have to
use this to access the color:
 "
*data.Shape['-content'][3].Appearance['-content'][1].Material['@diffuseColor']*
"
which is quite a mouthful.


Compare to this JSON5 structure instead:

{
"$": "Shape",

// Sphere begins
"geometry": {
"$": "Sphere"
},

// Sphere complete, Appearance begin
"appearance": {
"$": "Appearance",
"material": {
"$": "Material",
"$DEF": "MaterialLightBlue",
"diffuseColor": [0.1, 0.5, 1]
},

// Material complete, ImageTexture begin
"texture": {
"$": "ImageTexture",
"$DEF": "ImageCloudlessEarth",
"url": ["earth-topo.png"]
}
// ImageTexture complete
}
// Appearance complete
}

This time, you can access the color simply using: "
*data.appearance.material.diffuseColor*".


See you,
Cecile
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