--- trunk/TODO	2011/05/13 04:52:06	1211
+++ trunk/TODO	2011/05/13 08:00:33	1212
@@ -60,7 +60,7 @@
     to index into complete list
 
 [GLK:6] Use of Teem's "hest" command-line parser for getting
-any input variables that are not defined in the source file
+any "input" variables that are not defined in the source file.
 
 [GLK:7] ability to declare a field so that probe positions are
 *always* "inside"; with various ways of mapping the known image values
@@ -205,12 +205,12 @@
   field#2(3)[] F = bspln3 ⊛ img;
 or, as a tensor product of kernels, one for each axis, e.g.
   field#0(3)[] F = (bspln3 ⊗ bspln3 ⊗ tent) ⊛ img;
-This is especially important for things like time-varying data, or
-other multi-dimensional fields where one axis of the domain is very
-different from the rest, and hence must be treated separately when
-it comes to convolution.  What is very unclear is how, in such cases,
-we should notate the gradient, when we only want to differentiate with
-respect to some subset of the axes.  One ambitious idea would be:
+This is especially important for things like time-varying fields
+and the use of scale-space in field visualization: one axis of the
+must be convolved with a different kernel during probing.
+What is very unclear is how, in such cases, we should notate the
+gradient, when we only want to differentiate with respect to some
+subset of the axes.  One ambitious idea would be:
   field#0(3)[] Ft = (bspln3 ⊗ bspln3 ⊗ tent) ⊛ img; // 2D time-varying field
   field#0(2)[] F = lambda([x,y], Ft([x,y,42.0]))     // restriction to time=42.0
   vec2 grad = ∇F([x,y]);                             // 2D gradient

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