## 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 = tar (key, DEF);
  s = read_options (varargin, "op1", op1, "default", df);
  [key, DEF] = getfields (s, "key", "DEF");
end


static 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 struct_contains (nname, typ)
  typs = nname.(typ);
elseif ischar(typ)
  e2 = leval ("sprintf",\
	      append (list("    '%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)));
  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
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