Fix Metal shader compiler error in GpuRays (Lidar)

[darksylinc]

Signed-off-by: Matias N. Goldberg [email protected]

🦟 Bug fix

No ticket filed for this bug report.

Summary

Trying to use the heightmap in GpuRays (Lidar) in macOS / Metal will result in a shader compiler error.

This is a backport from PR #785 which includes this fix alongside the integration test that discovered this bug.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #786 (be8a7ea) into ign-rendering6 (a056220) will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           ign-rendering6     #786   +/-   ##
===============================================
  Coverage           77.85%   77.85%           
===============================================
  Files                 146      146           
  Lines               13404    13404           
===============================================
  Hits                10436    10436           
  Misses               2968     2968           

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