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[diderot] Diff of /branches/pure-cfg/TODO
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Diff of /branches/pure-cfg/TODO

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revision 824, Thu Apr 14 15:54:24 2011 UTC revision 950, Fri Apr 22 19:27:39 2011 UTC
# Line 2  Line 2 
2  SHORT TERM =============  (for curvature-based VR)  SHORT TERM =============  (for curvature-based VR)
3  ========================  ========================
4    
 For RGB color output of 2D transfer function (indexed by  
 kappa1,kappa2), or for a 1D transfer function, will need  
 something akin to convolution on vector images  
   
5  IL support for higher-order tensor values (matrices, etc).  IL support for higher-order tensor values (matrices, etc).
6      tensor construction [DONE]      tensor construction [DONE]
7      tensor indexing [DONE]      tensor indexing [DONE]
8      tensor slicing      tensor slicing
9      verify that hessians work correctly      verify that hessians work correctly [DONE]
10    
11  Outer products [DONE]  Outer products [DONE]
12    
13  Add M dot v, v dot M, and M dot N [DONE]  Add M dot v, v dot M, and M dot N [DONE]
14    
15  Identity matrix [DONE up to code generation]  Identity matrix [DONE]
16    
17  Zero tensor [DONE up to code generation]  Zero tensor [DONE]
18    
19  trace [DONE]  trace [DONE]
20    
21  extend norm (|exp|) to tensor[3,3]  extend norm (|exp|) to tensor[3,3] [DONE]
22    
23  extend implementation of scaling to work on higher-order tensors (it currently  Matrix addition, subtraction, and scaling  [DONE]
 just works on vectors)  
24    
25  Use ∇⊗ etc. syntax  Use ∇⊗ etc. syntax
26      syntax [DONE]      syntax [DONE]
# Line 44  Line 39 
39    
40  Infix "^" operator for pow() [DONE]  Infix "^" operator for pow() [DONE]
41    
42    Code generation support for 1D image data, such as RGBA transfer functions [DONE]
43    
44  ==============================  ==============================
45  other SHORT TERM =============  (including needed for LIC)  other SHORT TERM =============  (including needed for LIC)
46  ==============================  ==============================
47    
48  determinant ("det") for tensor[3,3]  test/uninit.diderot:
49    documents need for better compiler error messages when output variables
50  Decide if we want to allow redefinitions of variables  are not initialized; the current messages are very cryptic
   (as in vr-lite-cam.diderot)  
   
 extend norm (|exp|) to all tensor types  
51    
52  extend normalize to all tensor types  determinant ("det") for tensor[3,3]
53    
54  vector fields: convolution on vector images  extend norm (|exp|) to all tensor types [DONE for vectors and matrices]
55    
56  expand trace in mid to low translation  expand trace in mid to low translation
57    
# Line 68  Line 62 
62      rgba = real{4}      rgba = real{4}
63    
64  ==============================  ==============================
65  MEDIUM TERM ================== (needed for streamlines & tractography)  MEDIUM TERM ================== (including needed for streamlines & tractography)
66  ==============================  ==============================
67    
68    Want: allow X *= Y, X /= Y, X += Y, X -= Y to mean what they do in C,
69    provided that X*Y, X/Y, X+Y, X-Y are already supported.
70    Nearly every Diderot program would be simplified by this.
71    
72    Want: ability to apply "normalize" to a field itself, e.g.
73      field#1(2)[2] V = normalize(Vimg ⊛ ctmr);
74    so that V(x) = normalize((Vimg ⊛ ctmr)(x)).
75    (For now, it would be okay for the differentability of V to be 0;
76    later we can teach Diderot the quotient rule of derivatives.)
77    Having this would simplify expression of standard LIC method, and
78    would also help express other vector field expressions that arise
79    in vector field feature exraction
80    Related to this and possibly simpler:
81      image(2)[2] Vimg = load(...);
82      field#0(2)[] Vlen = |Vimg ⊛ bspln3|;
83    to get a scalar field of vector length, or
84      field#2(2)[] F = Fimg ⊛ bspln3;
85      field#0(2)[] Gmag = |∇F|;
86    to get a scalar field of gradient magnitude, or
87      field#2(2)[] F = Fimg ⊛ bspln3;
88      field#0(2)[] Gmsq = ∇F•∇F;
89    to get a scalar field of squared gradient magnitude, which is simpler
90    to differentiate.  Again, though, it would be such a benefit to have
91    these expressions, without any differentiability.  Hence my indication
92    of "field#0" for these above.
93    
94    ability to declare a field in such a way so that probe
95    positions are *always* clamped to the support of "inside";
96    there are many cases where this is the sensible behavior
97    
98  ability to emit/track/record variables into dynamically re-sized  ability to emit/track/record variables into dynamically re-sized
99  runtime buffer  runtime buffer
100    
# Line 78  Line 102 
102    
103  tensor fields: convolution on general tensor images  tensor fields: convolution on general tensor images
104    
105    Use of Teem's "hest" command-line parser for getting
106    any input variables that are not defined in the source file
107    
108    Save Diderot output to nrrd, instead of "mip.txt"
109      For grid of strands, save to similarly-shaped array
110      For list of strands, save to long 1-D (or 2-D for non-scalar output) list
111      For ragged things (like tractography output), will need to save both
112        complete list of values, as well as list of start indices and lengths
113        to index into complete list
114    
115  ==============================  ==============================
116  other MEDIUM TERM ============ (needed for particles)  other MEDIUM TERM ============ (needed for particles)
117  ==============================  ==============================
# Line 93  Line 127 
127    
128  proper handling of stabilize method  proper handling of stabilize method
129    
130  Add support for code like  test/vr-kcomp2.diderot: Add support for code like
131    
132          (F1 if x else F2)@pos          (F1 if x else F2)@pos
133    
# Line 104  Line 138 
138  other MEDIUM TERM ============  other MEDIUM TERM ============
139  ==============================  ==============================
140    
141  want: warnings when D (and likely I) is declared as a  want: warnings when "D" (reserved for differentiation) is declared as
142  variable name (now get confusing error messages now)  a variable name (get confusing error messages now)
143    
144  support for Python interop and GUI  support for Python interop and GUI
145    
# Line 113  Line 147 
147  LONG TERM ====================  LONG TERM ====================
148  ==============================  ==============================
149    
150  Better handling of variables that determines the scope of a variable based on its actual use,  Better handling of variables that determines the scope of a variable
151  instead of where the user defined it.  So, for example, we should lift strand-invariant variables  based on its actual use, instead of where the user defined it.  So,
152  to global scope.  Also prune out useless variables, which should include field variables after the  for example, we should lift strand-invariant variables to global
153  translation to mid-il.  scope.  Also prune out useless variables, which should include field
154    variables after the translation to mid-il.
155    
156  co- vs contra- index distinction  co- vs contra- index distinction
157    
# Line 141  Line 176 
176  BUGS =================  BUGS =================
177  ======================  ======================
178    
179    test/fields.diderot:
180    documents various bugs/questions associated with field expressions
181    
182  test/mip-cam.diderot:  test/mip-cam.diderot:
183      // generated C code looks like "(float)p_ui_0--0.5e0f"      // generated C code looks like "(float)p_ui_0--0.5e0f"
184      //real rayU = 2.0*camUmax*(real(ui) - -0.5)/real(imgResU) - camUmax;      //real rayU = 2.0*camUmax*(real(ui) - -0.5)/real(imgResU) - camUmax;
# Line 158  Line 196 
196  //  uncaught exception Size [size]  //  uncaught exception Size [size]
197  //    raised at c-target/c-target.sml:47.15-47.19  //    raised at c-target/c-target.sml:47.15-47.19
198  //field#4(3)[] F = img ⊛ bspln5;  //field#4(3)[] F = img ⊛ bspln5;
   
   

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