...as described in Peter Shirley's Ray Tracing in One Weekend
Cameron Christensen - Fall 2021
| Lambertian almost | Lambertian proper |
|---|---|
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- One method, called "almost Lambertians," creates vectors from random points in a unit circle. This is the default so you'll be more impressed when you see the other method.
- Another method projects these random points to the edge of the circle and creates vectors from these. You can see the distribution of vectors is more even across the hemisphere.
- Finally, the hemisphere was added, but its weaknesses are unclear, especially here in 2d.
'l'/'L' to cycle between methods
'c' to toggle source
'r' refresh
'+'/'-' inc/dec lines
'a' artistic colors
'g' toggle gui
I just wanted to better understand and compare these algorithms for Lambertian reflection.
This is my first use of jquery, svg, etc, and super hacky at that.
I just wrote quick Vec and Ray classes because I was too lazy to cut and paste anything, much less find a module to import, then learn how to use it--I just wanted to see some lines, remember? Plus xxXxXx has traumitized me so much that I now avoid ever wanting to use anyone else's libraries ever again.
Yes, I'm going to share this, and I don't want to be judged on this crap code, but it's still cool to press a couple keys to see the differences between these methods more clearly illustrated.
WARNING: ...and for hack sakes, don't look at this and try to actually create a reflection vector in real life.
More like "other things I'm curious to examine offline." By "offline" I mean outside the place where they'll be used, e.g., a ray tracer.
- other kinds of reflections, like smoother operators and psychiatric
- use random theta with hemi-circle to emulate uniform selection of theta on hemisphere
- 3d
- refractions