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Fix mesh loading for texture coordinates and face indices #25382 ### This PR changes * Texture coordinates were stored incorrectly (3-channel array is read as if there were 2 channels), fixed * Faces were pushed back to the output array instead of indexed writing which produced a lot of empty faces, fixed * A set of ground truth tests were added to cover these issues * `std::vector<cv::Mat>` support added for `saveMesh()` which is required for Python bindings * More command line args were added to rasterization test data generator ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [x] There is a reference to the original bug report and related work - [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [x] The feature is well documented and sample code can be built with the project CMake |
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