[bugfix] - ray distance scaling

[aclegg3]

Motivation and Context

RayHitInfo.rayDistance should be in units of ray length. In other words, rayDistance==1 indicates a world distance of length(ray.direction). The hit fraction from Bullet is already scaled this way, so additional scaling is not necessary, but was being done erroneously.

Because no tests or downstream code had the audacity to use non-unit ray directions, this bug was not caught until now.

How Has This Been Tested

Added a test.

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have completed my CLA (see CONTRIBUTING)
• I have added tests to cover my changes.
• All new and existing tests passed.

[0mdc]

LGTM!