96 lines
4.7 KiB
Plaintext
96 lines
4.7 KiB
Plaintext
Assimp Regression Test Suite
|
|
============================
|
|
|
|
1) How does it work?
|
|
---------------------------------------------------------------------------------
|
|
run.py checks all model in the <root>/test/models* folders and compares the result
|
|
against a regression database provided with assimp (db.zip). A few failures
|
|
are totally fine (see sections 7+). You need to worry if a huge
|
|
majority of all files in a particular format (or post-processing configuration)
|
|
fails as this might be a sign of a recent regression in assimp's codebase or
|
|
gross incompatibility with your system or compiler.
|
|
|
|
2) What do I need?
|
|
---------------------------------------------------------------------------------
|
|
- You need Python installed (2.7+, 3.x). On Windows, run the scripts using "py".
|
|
- You need to build the assimp command line tool (ASSIMP_BUILD_ASSIMP_TOOLS
|
|
CMake build flag). Both run.py and gen_db.py take the full path to the binary
|
|
as first command line parameter.
|
|
|
|
3) How to add more test files?
|
|
---------------------------------------------------------------------------------
|
|
Use the following procedure:
|
|
- Verify the correctness of your assimp build - run the regression suite.
|
|
DO NOT continue if more tests fail than usual.
|
|
- Add your additional test files to <root>/test/models/<fileformat>, where
|
|
<fileformat> is the file type (typically the file extension).
|
|
- If you test file does not meet the BSD license requirements, add it to
|
|
<root>/test/models-nonbsd/<fileformat> so people know to be careful with it.
|
|
- Rebuild the regression database:
|
|
"gen_db.py <binary> -ixyz" where .xyz is the file extension of the new file.
|
|
- Run the regression suite again. There should be no new failures and the new
|
|
file should not be among the failures.
|
|
- Include the db.zip file with your Pull Request. Travis CI enforces a passing
|
|
regression suite (with offenders whitelisted as a last resort).
|
|
|
|
4) I made a change/fix/patch to a loader, how to update the database?
|
|
---------------------------------------------------------------------------------
|
|
- Rebuild the regression database using "gen_db.py <binary> -ixyz"
|
|
where .xyz is the file extension for which the loader was patched.
|
|
- Run the regression suite again. There should be no new failures and the new
|
|
file should not be among the failures.
|
|
- Include the db.zip file with your Pull Request. Travis CI enforces a passing
|
|
regression suite (with offenders whitelisted as a last resort).
|
|
|
|
5) How to add my whole model repository to the database?
|
|
---------------------------------------------------------------------------------
|
|
|
|
Edit the reg_settings.py file and add the path to your repository to
|
|
<<model_directories>>. Then, rebuild the database.
|
|
|
|
6) So what is actually tested?
|
|
---------------------------------------------------------------------------------
|
|
The regression database includes mini dumps of the aiScene data structure, i.e.
|
|
the scene hierarchy plus the sizes of all data arrays MUST match. Floating-point
|
|
data buffers, such as vertex positions are handled less strictly: min, max and
|
|
average values are stored with low precision. This takes hardware- or
|
|
compiler-specific differences in floating-point computations into account.
|
|
Generally, almost all significant regressions will be detected while the
|
|
number of false positives is relatively low.
|
|
|
|
7) The test suite fails, what do do?
|
|
---------------------------------------------------------------------------------
|
|
Get back to <root>/test/results and look at regression_suite_failures.txt.
|
|
It contains a list of all files which failed the test. Failing dumps are copied to
|
|
<root>/test/results/tmp. Both an EXPECTED and an ACTUAL file is produced per test.
|
|
The output of "assimp cmpdump" is written to regressions_suite_output.txt. Grep
|
|
for the file name in question and locate the log for the failed comparison. It
|
|
contains a full trace of which scene elements have been compared before, which
|
|
makes it reasonably easy to locate the offending field.
|
|
|
|
8) fp:fast vs fp:precise fails the test suite (same for gcc equivalents)
|
|
---------------------------------------------------------------------------------
|
|
As mentioned above, floating-point inaccuracies between differently optimized
|
|
builds are not considered regressions and all float comparisons done by the test
|
|
suite involve an epsilon to accomodate. However compiler settings that allow
|
|
compilers to perform non-IEEE754 compliant optimizations can cause arbitrary
|
|
failures in the test suite. Even if the compiler is configured to be IEE754
|
|
comformant, there is lots of code in assimp that leaves the compiler a choice
|
|
and different compilers make different choices (for example the precision of
|
|
float intermediaries is implementation-specified).
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|