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OSL trace to gather information on second hit

Julius Ihle
 

Hi,

I'm trying to create a mask of everything after the first hit using `trace`. The way I was thinking of going about this is to do another trace call after the initial hit based on its P. I'm kind of getting the result I am after, however everything is really grainy and I cannot really wrap my head around as to why that is.

I'm using the following code:

```

int hit = trace(P, I);

if (hit)

{

point PP;

getmessage("trace", "P", PP);

int tt = trace(PP, I);

out = tt;

}

```

Which gives me this result:

I'm basically looking for exactly this result minus all the noise, which I'm not really sure why it's happening :) My approach is probably not the proper way to go about this.

Any help would be greatly appreciated!

Thanks, Julius


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Now: OSL TSC meeting ( every other week ) - 09/15/2022 #cal-notice

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Standardizing a perceptive color space.

philippe.groarke@...
 

It would be quite useful to have a perceptive color space (and its polar form) available natively in OSL. Something like CIELAB or Oklab.

cheers


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Q on preferred version bumping practice

Larry Gritz
 

As discussed in the last TSC meeting, I'm working on documenting our release practices, and I have a question about how people prefer to have the timing of version number changes in the trunk.

We release a tagged patch to the supported release branch monthly (more or less). But in between these tag+release events, we cherry-pick fixes into the branch that will get tagged for the next month's release. In other words, we have a history that looks like:

tagged 1.2.3 --> change A --> change B --> change C --> next tagged release

Here is the question. WHEN should we change CMakeLists.txt to bump the release number of this in-progress development branch to 1.2.4?

1. Bump the number at (A), so a dev build that includes ANY changes after the 1.2.3 release advertises itself as if it were the next version.

2. Bump the number at (C), the very last thing we do before tagging the next release, so that no build advertises itself as 1.2.4 until it's really a 1.2.4 release (or later).

3. It doesn't matter, any time between the releases is fine.

I've seen projects that operate both ways, and I think either is justifiable. I tend to do the first one, but I don't have any strong religious feelings about it. Since I'm writing docs for this process anyway, I thought I'd take this opportunity to see if people like that or if you would prefer the alternative.


--
Larry Gritz
lg@...


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OSL v1.12.6.0-beta

Larry Gritz
 

At long last, we have tagged "v1.12.6.0-beta"!

This is the first beta test release of OSL 1.12. The current plan is to have a true release
or or about October 1, after which the 1.12 family will be the new supported set of stable
production quality releases, and support for 1.11 will be sunset.

The full list of new features and changes for 1.12 (versus the initial release of 1.11)
is below.


Release 1.12 -- beta 1 Sep 2022 (compared to 1.11)
--------------------------------------------------
Big Deal Changes:
* **Batch shading**: A fully operational "batch shading" support when using
CPUs supporting the Intel AVX2 or AVX512 instruction set architectures,
allows shading 8 or 16 points at a time, accelerated by using SIMD
instructions. (Changes contributed by Intel.)
* **OptiX**: A reasonable subset of the OSL language can run on NVIDIA GPUs
for Cuda or OptiX-based renderers.
* **Standardized material closures**: Synchronize with MaterialX on a minimum
standard set of material closures. This is reflected in both the OSL spec as
well as reference implementations of those closures in testrender. #1533
#1536 #1537 #1538 #1539 #1541 #1542 #1547 #1557

Dependency and standards requirements changes:
* The minimum (and default) compilation mode is now C++14. C++17 and 20 are
also supported. #1362 #1369 (1.12.2)
* Minimum compilers are now gcc 6.1 (no more support for gcc 4.8), MSVS
2017 or newer (no more support for 2015).
* Minimum LLVM is now 9.0. Support for LLVM 7 and 8 have ben dropped.
#1441 (1.12.3)
* Minimum OpenImageIO is now 2.2: Support for OIIO 2.0 and 2.1 have been
dropped. #1426 (1.12.3)
* Minimum OpenEXR version is now 2.3 (raised from 2.0). #1406 (1.12.3)

OSL Language and oslc compiler:
* `#pragma error "message"` and `#pragma warning "message"` can be used to
conditionally inject a compile-time error or warning. #1300 (1.12.1)
* Check for errors when when writing oso files (for example, disk volume
full). #1360 (1.12.2/1.11.14)
* A new flavor of `gettextureinfo(texturename, paramname, s, t, destination)`
allows for querying of texture metadata about the particular UDIM tile
that will be used for particular (s,t) texture coordinates. #1398 (1.12.3)
* Better error detection when OSL user functions write to function parameters
that are not marked as output. #1417 (1.12.3)
* Detect and better error message when using a type name where a variable
identifier should be. #1457 (1.12.4.2)

OSL Standard library:
* vector2.h is updated with a mod() function for vector2. #1312 (1.12.1/1.11.12)
* Preliminary work for adding standard MaterialX closures. 31371 (1.12.2)
* Fix previously-broken color conversions from RGB to xyY. #1410 (1.12.3)
* Fully removed MaterialX shaders (get those from the MaterialX project).
#1450 (1.12.3)
* Fix incorrect implementation of `matrix4 * vector4` in vector4.h #1513
(1.12.5.0)

API changes, new options, new ShadingSystem features (for renderer writers):
* Custom experimental llvm optimization levels 10, 11, 12, and 13. These
are stripped down versions of 0, 1, 2, 3 (corresponding to clang's -O0,
-O1, -O2, -O3) but we think for shaders are just as performant but with
lower JIT time. These are currently experimental, but we are benchmarking
to determine if they should be the new defaults. #1250 (1.12.0.0)
* ShadingSystem attribute "searchpath:library" gives a searchpath for finding
runtime-loadable implementation modules for ISA-optimized operations.
#1310 (1.12.1)
* Output variable placement -- now you can designate where shader outputs
should go and the shader will put results there, instead of the app using
find_symbol() and symbol_address after the shader is executed. #1328 (1.12.2)
* Userdata input placement -- now you can designate where interpolated
userdata should be copied from directly, rather then via callbacks to
RendererServices::get_userdata(). #1391 (1.12.3)
* Better hiding of the Matrix22 class, which was never actually part of the
public APIs. #1480 (1.12.4.5)
* Add ACES2065-1 and ACEScg as shading system color spaces (#1486) (1.12.4.6)
* Expanded warnings (via enabling the "opt_warnings" attribute of the
ShadingSystem) for operations that try to create new strings mid-shader, or
that need to access the characters of strings mid-shader. These are only
triggered for those cases that cannot be resolved by the end of the "runtime
optimization" phase. #1497 (1.12.4.6)

SIMD batched shading mode:
* Added support for masked operations to LLVMUtil. #1248 #1250 (1.12.0.0)
* Add interface to ShadingSystem for batched execution. #1272 (1.12.0.1)
* Add interface to batched RendererServices. #1276 (1.12.0.1)
* Batched testshade. #1298 (1.12.1)
* ShadingSystem plumbing to support batched execution. #1301 (1.12.1)
* Batched analysis to figure out which symbols need to be varying or uniform,
and which operations require masking. #1313 #1318 #1322 (1.12.1)
* Additional infrastructure for batched analysis. #1316 (1.12.1)
* Add implementation for BatchedBackendLLVM. #1330 (1.12.1)
* ISA-specific modules. #1345 (1.12.2)
* Introduction of CI testing of batched mode. #1357 #1367 (1.12.2)
* Control flow and string ops. #1372 (1.12.2)
* Matrix operations. #1378 (1.12.2) #1485 (1.12.4.6)
* Batched algebraic, trig, and transcendental functions. #1385 (1.12.2)
* Batched noise. #1394 (1.12.3)
* Batched implementation of all color operations. #1408 (1.12.3)
* Batched bitwise ops. #1413 (1.12.3)
* Batched spline and spline inverse. #1422 (1.12.3)
* Batched texture, gettextureinfo, texture3d, environment. #1436 (1.12.3)
* Batched dictionary functionality (dict_find, etc.) #1445 (1.12.3)
* Enable batched execution of most testsuite. #1453 (1.12.4.1)
* Batched isnan, isinf, isfinite. #1456 (1.12.4.2)
* Batched userdata and output placement. #1455 (1.12.4.2)
* Batched pointcloud functions. #1464 (1.12.4.4)
* Batched closures (#1500)

OptiX rendering:
* Explicitly set the OptiX pipeline stack size. #1254 (1.12.0.0)
* CI tests now at least compile and build with USE_OPTIX=1 (though not yet
run the tests). #1281 (1.12.0.1)
* A simple self-contained Cuda/OptiX example has been added as
testsuite/example-cuda. #1280 (1.12.0.1)
* Overhaul in how strings are communicated to the GPU side. #1309 (1.12.1)
* Removal of runtime compilation of Cuda (libnvrtc dependency eliminated).
#1309 (1.12.1)
* Fix problems with unresolved symbols on GPU, particularly when multiple
shaders call certain functions like printf. #1401 (1.12.3)
* Changed prototype of osl_get_attribute callback to work properly on
GPU. #1404 (1.12.3)
* Fix missing hostdevice modifier on some matrix operators. #1409 (1.12.3)
* Fix race conditions when compiling for OptiX 7. #1411 (1.12.3)
* osl_get_attribute() uses device strings when compiling for OptiX.
#1435 (1.12.3)
* Fix issue with OptiX + clang 14 with duplicate symbols. #1561 (1.12.6.0)

Performance improvements:
* Less mutex locking around use and retrieval of ColorSystem related to
doing color transforms. #1405 (1.12.3)
* Constant folding of `startswith()`. #1507 (1.12.5.0)

Bug fixes and other improvements (internals):
* Fix derivatives of texture calls when only derivatives of the "alpha"
value are needed. #1251 (1.12.0.0)
* When uninitialized value detection is used, fix possible "false positive"
related to the condition variable of do-while loops. #1252 (1.12.0.0)
* Avoid some pointless copies of output variables from a used layer to a
downstream layer that is known to not be used. #1253 (1.12.0.0)
* Stats now print more information about build options and runtime hardware
capabilities. #1258 #1259 (1.12.0.1)
* The osl and oso parsers are now re-entrant, which allows different threads
to concurrently compile or load shaders. #969 (1.12.0.1)
* Fix asymptomatic potential runtime optimizer bug where certain
multi-component values were not correctly recognized as nonzero. #1266
(1.12.0.1/1.11.9)
* Fix optimizer bug where an `output` parameter that is also marked as
`[[lockgeom=0]]`, i.e., it gets a value from a userdata input, but also
passes it to a downstream connection or a renderer output, could end up
with an incorrect value if it was never read in the shader (including if
the only times it was read were optimized away). #1295 (1.12.0.1)
* Ensure that OSLCompiler::LoadMemoryCompiledShader returns false upon parse
failure. #1302 (1.12.1/1.11.10)
* During runtime optimization, don't merge layers that produce renderer
outputs (the semantics of doing so are very fishy). #1296 (1.12.1)
* Eliminate unnecessary error messages to stderr for broken point clouds.
#1333 (1.12.1/1.11.13)
* Fix undefined behavior that could result in crashes that resulted from
the Symbol class having no virtual destructor. #1397 (1.12.3)
* Fix in runtime optimizer where tracking of messages and unknown messages
relied on uninitialized variables. #1447 (1.11.17/1.12.3)
* Stop internally using OIIO::string_view::c_str(), which will someday be
removed. #1458 (1.12.4.2)
* Correctly track that the backfacing() function requires N and I shader
globals. #1462 (1.12.4.4)
* Print all 4 levels of version numbers in help messages. #1477 (1.12.4.4)
* Fix GPU code generation crash. #1479 (1.12.4.4)
* Work to transition internals to use modern std::format notation for
formatted output. #1487 #1490 (1.12.4.6) #1504 #1506 (1.12.5.0)
* testrender improvements:
* Fix testrender memory error on teardown. #1499 (1.12.4.6)
* Modernize the sampler in testrender, improving quality and performance.
#1534 (1.12.6.0)
* Switch to cone tracing for derivatives. #1543 (1.12.6.0)
* Fix error that prevented correct typecheck of ternary operator. #1552
(1.12.6.0)

Internals/developer concerns:
* Use the `final` keyword in certain internal classes where applicable.
#1260 (1.12.0.1/1.11.9)
* Minor fixes to the internal TypeSpec and Symbol classes. #1267 (1.12.0.1)
* Switch from deprecated call to OIIO::parallel_image to the new version.
#1317 (1.11.11/1.12.1)
* The "archive_groupname" handling is now careful to sanitize the filenames
it deals with, closing some security and safety holes. #1383 (1.12.2)
* More migration of string formatting to new std::format style. #1389 (1.12.3)
#1469 #1470 (1.12.4.4)
* llvm_util: Switch some uses of ptr+len to span. #1390 (1.12.3)
* OSL no longer uses sscanf internally (which has icky locale-dependent
behavior), and instead use locale-independent OIIO::Strutil utilities
whenever we need to parse strings. #1432 (1.12.3)
* Avoid use of OIIO::string_view::str() which is not corresponding to the
official C++17 std::string_view. #1467 (1.12.4.4)
* Prototype of "free function" approach that will someday mostly supplant
the way we use RendererServices, and will help to unlock feature completion
for GPU and other back ends. This experimental feature is not expected
to be used in OSL 1.12. #1494 (1.12.5.0)
* Work on gradually converting printf-style formatted strings to fmt /
std::format style. #1493 (1.12.5.0)
* LLVM_Util: allow naming of llvm symbols to help with IR debugging. #1530
(1.12.6.0)
* clang-format the code base. #1508 #1509 #1511 #1512 #1515 #1518 #1540
(1.12.5.0) #1555 #1562 #1568 (1.12.6.0)
* A round of spell-checking all the comments in the code base. #1550
(1.12.5.0)

Build & test system improvements:
* CMake build system and scripts:
- We now use .git-blame-ignore-revs to record commits that consist
entirely of reformatting, so that 'git blame' does not misattribute
authorship to the trivial changes of those commits. #1244 (1.12.0.0)
- Miscellaneous improvements to cmake scripts. #1247 (1.12.0.0)
- Instead of defaulting to looking for Python 2.7, the OSL build now
defaults to whatever Python is found (though a specific one can still
be requested via the PYTHON_VERSION variable). #1249 (1.12.0.0/1.11.8)
#1286 (1.12.0.1/1.11.9)
- Extend checked_find_package with VERSION_MIN and VERSION_MAX. #1303
(1.12.1/1.11.10)
- Make the CMake build scripts more friendly to being a subproject.
#1304 #1319 (1.11.11/1.12.1)
- We weren't properly hiding non-public symbols. #1337 (1.12.1/1.11.12)
- Fully split oslquery and oslnoise libraries from oslexec, no more
redundant modules put into both. #1346 #1348 (1.12.1)
- Support for CMake 3.20 #1354 (1.12.2/1.11.14)
- Important change to `Makefile` wrapper: We have a 'Makefile' that just
wraps cmake for ease of use. This has changed its practice of putting
builds in `build/ARCH` to just `build` (and local installs from
`dist/ARCH` to `dist`) to better match common cmake practice. So where
your local builds end up may shift a bit. #1396 (1.12.3)
- Be more careful about not writing over a sensitive install area
unless CMAKE_INSTALL_PREFIX is explicitly set. #1421 (1.12.3)
- PROJECT_VERSION_RELEASE_TYPE and OSL_SUPPORTED_RELEASE are now
cache variables that can have build-time overrides. #1443 (1.12.3)
- Use PROJECT_IS_TOP_LEVEL (not OSL_IS_SUBPROJECT) to confirm with
CMake 21 conventions. #1443 (1.12.3)
- New TIME_COMMANDS option, when enabled, can help debug performance of
the build. #1443 (1.12.3)
- New CMake variable `DOWNSTREAM_CXX_STANDARD` sets the downstream
minimum C++ requirement, separately from `CMAKE_CXX_STANDARD` which sets
what we build OSL itself with. Clarify that currently, OSL can be used
downstream by C++14, even if it is built with C++17 or higher. #1454
(1.12.4.1)
- Make exported cmake configs relocatable by using relative paths. #1466
(1.12.4.4)
* Dependency version support:
- Build properly against Cuda 11 and OptiX 7.1. #1232 (1.12.0.1)
and up to OptiX 7.4 #1559 (1.12.6.0)
- PugiXML build fixes on some systems. #1262 (1.12.0.1/1.11.8)
- Cuda/OptiX back end: Add `__CUDADEVRT_INTERNAL__` define to bitcode
generation, needed to avoid duplicate cudaMalloc symbols with CUDA9+
#1271 (1.12.0.1)
- Build against LLVM 11 #1274 (1.12.0.1), LLVM 12 #1351 (1.12.1.0)
#1412 (1.12.3), LLVM 13 #1420 (1.12.3), LLVM 14 #1492 (1.12.4.6)
- Fix build break against recent OIIO master change where m_mutex field
was removed from ImageInput. #1281 (1.12.0.1/1.11.9)
- Work to ensure that OIIO will build correctly against the upcoming
Imath 3.0 and OpenEXR 3.0. #1299 (1.11.10/1.12.1) #1332 (1.11.11/1.12.1)
#1341 (1.11.12/1.12.1) #1356 #1368 (1.11.13/1.12.2) #1489 (1.12.4.6)
- Improved finding of llvm components when using static libraries. #1375
(1.12.2)
- No longer use boost regex, completely rely on std::regex now that OSL
is C++14 minimum. #1377. (1.12.2)
- Support for OpenImageIO 2.3 changes. #1393 (1.12.3)
- Some rearrangement of `#include` and other trickery ensures that OSL
always includes headers from its favored version of Imath, rather than
the ones that OIIO prefers (in cases where OIIO and OSL were each based
on different Imath versions). #1460 (1.12.4.2)
- Various fixes for functionality and warnings for Intel icc and icx
compilers. #1459 #1473 #1475. (1.12.4.4)
- Fixes for recent OIIO TextureSystem changes that hide Imath types.
#1476 (1.12.4.4)
- Changes to work correctly with OpenImageIO 2.4 and its master being
the start of 2.5. #1569 (1.12.6.0)
* Testing and Continuous integration (CI) systems:
- Eliminate the old Travis CI and Appveyor. #1334 #1338 (1.12.1)
- Use ccache + GitHub 'cache' action to greatly speed up CI runs. #1335
(1.12.1)
- Divide the CI stages into separate steps, combine dependency-building
scripts for CentOS and Ubuntu ito a single script. #1338 (1.12.1)
- CI tests clang11, also batched shading with clang. #1379 (1.12.2)
- CI speeds up OIIO builds by not building its tests. #1380 (1.12.2)
- CI tests gcc11 #1381 (1.12.2) and gcc12 #1565 (1.12.6)
- Deal with OpenColorIO changing its master branch to "main". #1429
(1.12.3)
- Fix tests for texture3d now that OIIO has dropped support for Field3D.
#1437 (1.12.3)
- Test against LLVM13/clang13 for the VFX Platform 2022 tests. #1434
(1.12.3)
- CI test against MacOS-11 #1434 (1.12.3) and MacOS-12 #1554 (1.12.6)
#1522 (1.12.5)
- Add testsuite coverage of environment(). #1438 (1.12.3)
- Use a project-specific environment variable `OSL_CI` instead of the more
generic `CI` to avoid clashes with other systems. #1446 (1.12.3)
- Deal with OpenEXR and Imath changing its master branch to "main". #1463
(1.12.4.4)
- testrender fix sphere tangents, per MaterialX suggestion. #1465
(1.12.4.4)
- Allow testsuite tests to use oiiotool for image diffs instead of idiff.
#1472 (1.12.4.4)
- Allow `-Werror` to be disabled even on CI branches. #1471 (1.12.4.4)
- CI Tests against the Intel icc and icx compilers! #1459 #1473 (1.12.4.4)
#1501 (1.12.5.0)
- Overhaul of GHA ci.yml to use strategy matrix. #1474 (1.12.4.4)
- Test against clang 14 and fix new warnings. #1498 (1.12.5.0)
- A scorecards workflow guards against a variety of security issues of
the CI system itself. #1529 (1.12.6.0)
- Enable SonarCloud static analysis. #1551 #1556 #1563 (1.12.6.0)
* Platform support:
- Various Windows compile fixes. #1263 #1285 (1.12.0.1)
- Windows+Cuda build fixes. #1292 (1.12.0.1)
- Fix warnings about pointer casts on Windows. #1484 (1.12.4.5)
- Various Windows build fixes. #1502 (1.12.5.0)
* The oso and osl lexers/parsers are now given internal symbol names that
are fully versioned, to avoid possible clash if multiple OSL releases are
both linked into the same application. #1255 (1.12.0.0)

Documentation:
* A simple self-contained Cuda/OptiX example has been added as
testsuite/example-cuda. #1280 (1.12.0.1)
* Update CLAs, Charter, GOVERNANCE, particularly after acceptance of new
CLAs and moving the repo to the ASWF GitHub account. #1308 #1240 #1314
(1.11.11/1.12.1)
* First steps in new documentation and scripts for building OSL on Windows.
#1326 (1.12.1)
* Fix missing explanation of the optional "errormessage" parameter to
environment() and texture3d(). #1442 (1.12.3/1.11.17)
* A SECURITY.md file explains how to confidentially report vulnerabilities.
#1529 (1.12.6)
* Document all the new MaterialX closures. #1564

--
Larry Gritz
lg@...


Now: OSL TSC meeting ( every other week ) - 09/01/2022 #cal-notice

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OSL TSC meeting ( every other week )

When:
09/01/2022
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(UTC-07:00) America/Los Angeles

Where:
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Every other week meeting of the OSL TSC.

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Event: OSL TSC meeting ( every other week ) - 09/01/2022 #cal-reminder

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Event: OSL TSC meeting ( every other week ) - 09/01/2022 #cal-reminder

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Event: OSL TSC meeting ( every other week ) - 09/01/2022 #cal-reminder

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Upcoming Events #cal-summary

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osl-dev@... Upcoming Events

OSL TSC meeting ( every other week )

When:
Thursday, September 1, 2022, 2:00pm to 3:00pm
(GMT-07:00) America/Los Angeles

Where:
https://zoom.us/j/100511909

Organizer: Chris Kulla ckulla@...

Details:

Every other week meeting of the OSL TSC.

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OSL TSC meeting ( every other week )

When:
Thursday, September 15, 2022, 2:00pm to 3:00pm
(GMT-07:00) America/Los Angeles

Where:
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Organizer: Chris Kulla ckulla@...

Details:

Every other week meeting of the OSL TSC.

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App integration Documentation

Alvaro Castaneda
 

Hello
Sorry if you thought this was the documentation, but I'm asking for it.
I'm currently integrating OSL into an application I am building, I've been looking at the osltoy and the testrender for reference. I got my shader to compile and render the image so far, which is good but to be honest, there's so much stuff that I just used from the source code that I have no idea what is doing and it is quite possible I'm making a mess on my project.

I would really appreciate some documentation on how oslc, oslexec work and how you are supposed to integrate this.
Most of you are pros and have probably built hundreds of renderers, I am not, and getting started is hard, that on top of learning the ins and outs of C++.

I can contribute back, doing some OSL shading tutorials, I have a vast experience on making online training, so far the only good docs about that are the Zap videos, which are pretty good, I would like to do some shading training based on some projects.

thanks for your help and I'll keep grinding cause this app is not going to build itself :)

Cheers!


Upcoming Events #cal-summary

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osl-dev@... Upcoming Events

OSL TSC meeting ( every other week )

When:
Thursday, September 1, 2022, 2:00pm to 3:00pm
(GMT-07:00) America/Los Angeles

Where:
https://zoom.us/j/100511909

Organizer: Chris Kulla ckulla@...

Details:

Every other week meeting of the OSL TSC.

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OSL TSC meeting ( every other week )

When:
Thursday, September 15, 2022, 2:00pm to 3:00pm
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Where:
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Organizer: Chris Kulla ckulla@...

Details:

Every other week meeting of the OSL TSC.

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Meeting ID: 100 511 909

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Dial by your location +1 646 558 8656 US (New York) +1 312 626 6799 US (Chicago) +1 669 900 6833 US (San Jose) +1 253 215 8782 US +1 301 715 8592 US +1 346 248 7799 US (Houston) 877 369 0926 US Toll-free 855 880 1246 US Toll-free +1 587 328 1099 Canada +1 647 374 4685 Canada +1 647 558 0588 Canada +1 778 907 2071 Canada +1 438 809 7799 Canada 855 703 8985 Canada Toll-free Meeting ID: 100 511 909 Find your local number: https://zoom.us/u/acBVrM6HWR

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