assure raytrace always progress to prevent infinite loop

[GuySten]

Description

Please include a summary of the change and which issue is fixed if applicable. Please also include relevant motivation and context.

Fixes # (issue)

Checklist

• I have performed a self-review of my own code
• I have run clang-format (version 15) on any C++ source files (if applicable)
• I have followed the style guidelines for Python source files (if applicable)
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works (if applicable)

[coveralls]

Pull Request Test Coverage Report for Build 15568616619

Details

• 2 of 3 (66.67%) changed or added relevant lines in 1 file are covered.
• 114 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.001%) to 85.157%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/mesh.cpp	2	3	66.67%

Files with Coverage Reduction	New Missed Lines	%
src/mesh.cpp	114	88.19%

Totals
Change from base Build 15568579285:	0.001%
Covered Lines:	52364
Relevant Lines:	61491

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💛 - Coveralls