| Date |
Implementation History |
| 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).
Code capabilities:
- Unshadowed SH coefficients computed per-frame in GLSL to degree 4.
- Swtich light probes at run time.
- Switch scene / object at run time.
- Mouse handler to control scene rotation. (from 3d Labs Demo)
|
| 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.
- Shadowed SH coeffs rotated by Wigner D-matrix at run time, shadowed vertex colours computed in CPU.
- Switch SH degree at run time.
- Switch shading models (SH shadowed / SH unshadowed / standard OpenGL) at run time.
|
| 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.
- Switch shading models (SH interreflected / Interreflected only / SH shadowed / SH unshadowed / standard OpenGL) at run time.
- Circular light window added as alternative to light probes. SH coeffs computed at runtime by efficient recurrence -- so aperture can be varied in real time.
|
| 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
|
