Algodoo

Interesting scene! I never heard of Hottel or his string theory (or whatever it's called). I noticed that if I rotate either surface past 90 degrees (now facing away from other surface), then the F12 values become negative. But if I rotate BOTH surfaces so that they are both facing away from each other, then the values become positive. This doesn't seem logical, but not knowing anything about Hottel and his strings, it may be perfectly normal.

BTW - The surface 2 name is F21 (rather than F12). I assume that's a typo.

I learned something new today! (now I need to research Mr. Hottel and his amazing strings!

F21 is named correctly. View factor F12 is the fraction of total radiation from surface 1 that falls on surface 2. View factor F21 is the fraction of total radiation from surface 2 that falls on surface 1. F12 * L1 = F21 * L2. If L2 = 2 * L1, then F21 will be F12/2. The method only works as long as the 4 laser beams contact the corners of the surface 1.

Hottel's method works on curved surfaces and also when a third object blocks some of the radiation. This scene doesn't handle curved surfaces or partial blockage, but it probably could if I used (6) elastic bands for strings.

WOW! 10/10 this scene could help people to make polygons with pos surface-reference it would be really really difficult for me to make code that solves that problem !

Edit: Added to favorites!

Dynamic lasers are really cool feature.

Thanks.

I agree with Kilinich. You are very talented to be able to convert math equations into efficient Thyme script. Those lasers that rotate and follow the corners of the box is quite clever. I don't recall any other scene that does that.