Fix for GuyFinal rotation.
Merge pull request #1169 from ey6es/master

Fix for GuyFinal rotation.
Sanity check to prevent crash in Model::simulate.
Merge pull request #1171 from ey6es/master

Sanity check to prevent crash in Model::simulate.
Merge pull request #1170 from ZappoMan/point_shader

first cut a variable point size point rendering