Merge pull request #178 from 2014-Android-ITX4/test-170

fix #171 fix #170 fix #175 fix #177
fix #180
Merge pull request #181 from 2014-Android-ITX4/fix-180

fix #180
update
Merge branch 'master' into test-170
fix #182 sphere rendering trouble.
Merge pull request #183 from 2014-Android-ITX4/fix-182

Fix 182