build_param (layer->add_child("param"),"z_depth","real","0");
build_param (layer->add_child("param"),"amount","real","1");
build_param (layer->add_child("param"),"blend_method","integer","21"); //straight onto
build_param (layer->add_child("param"),"z_depth","real","0");
build_param (layer->add_child("param"),"amount","real","1");
build_param (layer->add_child("param"),"blend_method","integer","21"); //straight onto