Added Lines interactive to test lines
It's not a trick question... yet it is.
Lines can now be interpreted from the MML
I had to deal with a really awkward coordinate system for the lines to get things to work properly.
Lines are now supported by the md2d engine
It's a pain to find and add support for another object in such a large engine.
Lines now render
It's a start. Everything works but line arrowheads.
Added line-reflection interactive to test line reflection
It's a maze to see which particle can reach the end first!
Lines export, render, and reflect particles properly
I used four cross products to tell a particle will intersect a line.
Arrowheads are in the works.
Arrowheads can now render
Note: Lines that are too thin will have arrowheads that are too small.
Fixed broken tests
time-step-5.0.json had a line which didn't export before.