Hi everyone. Sorry for my bad English. I create dae file to export to the web app. My surface has texture only on back (one side of surface). I want it has face and back texture. In collada spec 1.5 (page 26) i see that we should apply semantic attribute with double sided:
<input semantic="POSITION" source="#grid-Position"/>
<newparam sid="blah">
<semantic>DOUBLE_SIDED</semantic>
<float>1.0</float>
</newparam>

But when i do this nothing changed. I paste this code:

<effect name="Material0-fx" id="Material0-fx">
<profile_COMMON>
<newparam sid="Image-Material0-surface">
<surface type="2D">
<init_from>Image-Material0</init_from>
<format>A8R8G8B8</format>
</surface>
</newparam>
<newparam>
<semantic>DOUBLE_SIDED</semantic>
</newparam>

<technique id="Material0-fx-COMMON" sid="COMMON">
<phong>
<ambient>
<color>1 1 1 1</color>
</ambient>
<diffuse>
<texture texture="Image-Material0-sampler" texcoord="CHANNEL1" />
</diffuse>
<specular>
<color>0.00784313725490196 0.00784313725490196 0.00784313725490196 1</color>
</specular>
<shininess>
<float>0.3125</float>
</shininess>
<transparency>
<float>0</float>
</transparency>
</phong>
</technique>
</profile_COMMON>
</effect>


What is wrong in my code that texture applied only for back of surface?