|23 July 2006||Project started|
|July-Aug 2006||Mathematical theory of SH functions, lighting equation, Monte Carlo integration etc.
Derive efficient recurrence for SH evaluation in real basis.
|Aug 2006||Code for lighting SH coefficients — standalone program.
Use light probes from Paul Debevec, SH coeffs found using code modified from Ravi Ramamoorthi’s. Our code works to any SH degree.
|15 Sept 2006||Code for reading polygon mesh files|
|18 Sept 2006||
Diffuse Unshadowed Transfer (Using shader language GLSL).
Unshadowed SH coefficients computed per-frame in GLSL to degree 4.
|22 Sept 2006||Texture map light probe to sphere|
|25 Sept 2006||Replace drawing objects with VertexArray|
|28 Sept 2006||Simple ray tracing — spheres and boxes.|
|10 Oct 2006||Wigner-D matrix (rotation) via general recurrence to arbitrary SH degree.|
|Oct 2006||Improve efficiency of light probe file read / SH calculation and merge into main SH project.|
|12 Oct 2006||
Diffuse Shadowed Transfer (in CPU).
Code capabilities — as for unshadowed case, plus:
Shadowed SH coefficients precomputed via per-vertex ray casting / Monte Carlo integration.
|16 Oct 2006||Improve ray tracing method: eliminate objects behind ray origin.|
|17 Nov 2006||SH degree arbitrary in all parts of code, systematic mechanism for changing.|
|25 Nov 2006||
Diffuse Interreflected Transfer (in CPU).
Code capabilities — as for shadowed case, plus:
Interreflected coeffs precomputed via 2nd ray trace.
|29 Nov 2006||Write & read .PLY files using RPLY library (Diego Nehab), including shadowed and interreflected SH coeffs.|
|Dec 2006||Ray tracing arbitrary polygon mesh objects; save hit records to improve speed of ray trace for interreflected transfer.|
|Jan 2007||Re-structure the program to more OO flavour.
Code is now data-centric, not function-centric. Module interdependencies clarified and reduced.
Added all-of-scene data structure & allow whole scene with SH coeffs to be read / written to file.
|22 Nov 2007||Uniform Grid Subdivision (UGS) ray tracing implemented successfully.|
|25 Nov 2007||Succeed switching to 3ds format for mesh objects|
|28 Nov 2007||Switch to command-line parse|