Improved grid coverage

[ahcorde]

Signed-off-by: ahcorde [email protected]

🎉 New feature

Summary

Related with gazebosim/gz-sim#1575

Improved grid coverage

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• 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 #737 (4c978fd) into ign-rendering3 (4a364a2) will increase coverage by 0.46%.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           ign-rendering3     #737      +/-   ##
==================================================
+ Coverage           76.42%   76.88%   +0.46%     
==================================================
  Files                 100      100              
  Lines                7805     7805              
==================================================
+ Hits                 5965     6001      +36     
+ Misses               1840     1804      -36     

Impacted Files	Coverage Δ
ogre2/src/Ogre2DynamicRenderable.cc	52.95% <0.00%> (+3.73%)	⬆️
ogre2/src/Ogre2Grid.cc	97.40% <0.00%> (+31.16%)	⬆️

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