fixed testing of whether screenToModelCoordinates's result value is behind the camera

use glm::project instead of figuring out the conversion manually...

use glm::unProject to implement screenToModelCoordinates

PartRenderer::modelToScreenCoordinates FINALLY WORKS

grid stuff

made the grid look nicer

added grid program

avoid having the null id in the selection

selection works now

fix some warnings

wrote the id color in terms of the id value in the shader now that I can get the id to the shader properly

added selection highlighting

picking works now

added the pick scene

(0) -14 +14 +100 +300 tip

mercurial