added routine to preview
got previewer to show basic stuff
get colors working
get all scenes rendering
rename v -> vn for vertnorms
move sphere translation into xform matrix
set material properties
fix bug in initialization of light num
trying to get lights working
use fov from model
shading working
reorg
more work on material/light properties
add a default diffuse value
working on making image
update image printer to use glm::vec3
working on fov
calculate center of pixel regions
refactor Scene::Render
only draw pixels on small images, init glut with large window