trees sorta work, but breaks selection
	modified:   ../../web/lib/pre3d.js
	modified:   ../../web/mc/map/cameraAndStuff.js
	modified:   ../../web/mc/map/index.html
	modified:   ../../web/mc/map/tree.js
trees and fly-to-tree.  still a problem with negative/positive so flying to opposite point
	modified:   ../../web/lib/pre3d.js
	modified:   ../../web/mc/map/cameraAndStuff.js
	modified:   ../../web/mc/map/demoUtils.js
	modified:   ../../web/mc/map/hasher.js
	modified:   ../../web/mc/map/index.html
	modified:   ../../web/mc/map/tree.js