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**824**- (**download**) (**annotate**)*Thu Apr 14 15:54:24 2011 UTC*(10 years, 2 months ago) by*jhr*File size: 4303 byte(s)

Some debugging and added "^" as power operator.

======================== SHORT TERM ============= (for curvature-based VR) ======================== 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 IL support for higher-order tensor values (matrices, etc). tensor construction [DONE] tensor indexing [DONE] tensor slicing verify that hessians work correctly Outer products [DONE] Add M dot v, v dot M, and M dot N [DONE] Identity matrix [DONE up to code generation] Zero tensor [DONE up to code generation] trace [DONE] extend norm (|exp|) to tensor[3,3] extend implementation of scaling to work on higher-order tensors (it currently just works on vectors) Use ∇⊗ etc. syntax syntax [DONE] typechecking IL and codegen Add sequence types syntax types: ty '{' INT '}' value construction: '{' e1 ',' … ',' en '}' indexing: e '{' e '}' Infix dot product and cross product [DONE] lerp on scalars and vectors [DONE] Infix "^" operator for pow() [DONE] ============================== other SHORT TERM ============= (including needed for LIC) ============================== determinant ("det") for tensor[3,3] Decide if we want to allow redefinitions of variables (as in vr-lite-cam.diderot) extend norm (|exp|) to all tensor types extend normalize to all tensor types vector fields: convolution on vector images expand trace in mid to low translation value-numbering optimization Add type aliases for color types rgb = real{3} rgba = real{4} ============================== MEDIUM TERM ================== (needed for streamlines & tractography) ============================== ability to emit/track/record variables into dynamically re-sized runtime buffer evals & evecs for symmetric tensor[3,3] tensor fields: convolution on general tensor images ============================== other MEDIUM TERM ============ (needed for particles) ============================== run-time birth and death of strands "initially" supports lists "initially" supports lists of positions output from different initalization Diderot program spatial data structure that permits strands' queries of neighbors proper handling of stabilize method Add support for code like (F1 if x else F2)@pos This will require duplication of the continuation of the conditional (but we should only duplicate over the live-range of the result of the conditional. ============================== other MEDIUM TERM ============ ============================== want: warnings when D (and likely I) is declared as a variable name (now get confusing error messages now) support for Python interop and GUI ============================== LONG TERM ==================== ============================== Better handling of variables that determines the scope of a variable based on its actual use, instead of where the user defined it. So, for example, we should lift strand-invariant variables to global scope. Also prune out useless variables, which should include field variables after the translation to mid-il. co- vs contra- index distinction add ":" for tensor dot product (contracts out two indices instead of one like •), valid for all pairs of tensors with at least two indices some indication of tensor symmetry (have to identify the group of index permutations that are symmetries) dot works on all tensors outer works on all tensors Einstein summation notation "tensor comprehension" (like list comprehension) Python/ctypes interface to run-timez ====================== BUGS ================= ====================== test/mip-cam.diderot: // generated C code looks like "(float)p_ui_0--0.5e0f" //real rayU = 2.0*camUmax*(real(ui) - -0.5)/real(imgResU) - camUmax; test/vr-kcomp.diderot: // HEY (scoping BUG): the strand parameters (e.g. ui, vi) ... test/zslice2.diderot: // but is this not valid syntax for creating field in one shot? //field#2(3)[] F = (load("../data/zimg112.nrrd")) ⊛ bspln3; // It is valid syntax, but there is a bug in the conversion from HighIL to MidIL test/zslice2.diderot: // HEY (bug) bspln5 leads to problems ... // uncaught exception Size [size] // raised at c-target/c-target.sml:47.15-47.19 //field#4(3)[] F = img ⊛ bspln5;

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