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**788**- (**download**) (**annotate**)*Fri Apr 8 03:57:23 2011 UTC*(9 years, 10 months ago) by*jhr*File size: 3181 byte(s)

minor edits to TODO list

======================== SHORT TERM ============= (for curvature-based VR) ======================== IL support for higher-order tensor values (matrices, etc). tensor construction tensor indexing and slicing verify that hessians work correctly Outer products syntax [DONE] typechecking IL and codegen Add M dot v, v dot M, and M dot N Identity matrix [DONE up to code generation] trace [DONE] extend norm (|exp|) to tensor[3,3] 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] ============================== 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 ============================== LONG TERM ==================== ============================== 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) ====================== 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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