tests for normal, intersection

• normal vec3 and dir3, intersection ray3, sphere3
• latest tg

changed title from normal, intersection to tests for normal, intersection

changed the description

added 7 commits

• 403bff7a...b03b8989 - 5 commits from branch develop
• a64a2d0e - Merge remote-tracking branch 'origin/develop' into jschakib
• e6db1261 - remove emtpy test file

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assigned to @ptrettner

mentioned in commit f64fb531

merged