--- /dev/null
+## Copyright (C) 2005-2012 Etienne Grossmann <etienne@egdn.net>
+##
+## This program is free software; you can redistribute it and/or modify it under
+## the terms of the GNU General Public License as published by the Free Software
+## Foundation; either version 3 of the License, or (at your option) any later
+## version.
+##
+## This program is distributed in the hope that it will be useful, but WITHOUT
+## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+## details.
+##
+## You should have received a copy of the GNU General Public License along with
+## this program; if not, see <http://www.gnu.org/licenses/>.
+
+## s = vrml_interp (typ, val,...)
+
+function s = vrml_interp (typ, val, varargin)
+
+key = [];
+DEF = "";
+if nargin < 1, help vrml_interp; return; end
+if nargin < 2
+ val = [];
+elseif nargin > 2
+ op1 = " key DEF ";
+ df = tars (key, DEF);
+ s = read_options (varargin, "op1", op1, "default", df);
+ [key, DEF] = getfields (s, "key", "DEF");
+end
+
+
+persistent nname = struct ("col" , "Color",
+ "Color" , "Color",
+ "coord" , "Coordinate",
+ "Coordinate" , "Coordinate",
+ "normal" , "Normal",
+ "Normal" , "Normal",
+ "orient" , "Orientation",
+ "Orientation", "Orientation",
+ "pos" , "Position",
+ "Position" , "Position",
+ "scal" , "Scalar",
+ "Scalar" , "Scalar");
+if isfield (nname, typ)
+ typs = nname.(typ);
+elseif ischar(typ)
+# e2 = leval ("sprintf",\
+# append (list(" '%s'\n"), fieldnames (nname)));
+ e2 = sprintf(" '%s'\n", fieldnames (nname){:});
+ error ("vrml_interp : Unknown type '%s'. Should be in:\n%s",typ,e2);
+else
+# e2 = leval ("sprintf",\
+# append (list(" '%s;\n"), fieldnames (nname)));
+ e2 = sprintf(" '%s'\n", fieldnames (nname){:});
+ error ("vrml_interp : typ should be a string in:\n%s",typ,e2);
+end
+
+if isempty (val)
+ vs = "";
+else
+ vs = sprintf ("%8.5f, ", val);
+ vs = sprintf (" keyValue [ %s ]\n", vs(1:length(vs)-2));
+end
+if isempty (key)
+ ks = "";
+else
+ ks = sprintf ("%8.5f, ", key);
+ ks = sprintf (" key [ %s ]\n", ks(1:length(ks)-2));
+end
+if length (DEF), defs = ["DEF ",DEF," "];
+else defs = "";
+end
+
+s = [defs,typs,"Interpolator {\n", vs, ks,"}\n"];endfunction
+