Invalid curves from exported alembic cache #50529

New Issue

Chris Rydalch · 2017-01-26T02:59:13+01:00

Chris Rydalch commented

2017-01-26 02:59:13 +01:00

System Information
Linux Mint 18.1
GeForce 1060 GTX

Blender Version
2.78a e8299c8

Short description of error
Exported alembic cache contains curves with invalid vertex counts

Exact steps for others to reproduce the error
I downloaded the rocket/launchpad model from blendswap (http:*www.blendswap.com/blends/view/69355 ), and exported the scene as an alembic cache.

The cache imports into Houdini just fine, but when rendering, it crashed. When I submitted a bug to SideFX, they indicated the curves being generated have invalid vertex counts, and are corrupt.

Thanks!

**System Information** Linux Mint 18.1 GeForce 1060 GTX **Blender Version** 2.78a e8299c8 **Short description of error** Exported alembic cache contains curves with invalid vertex counts **Exact steps for others to reproduce the error** I downloaded the rocket/launchpad model from blendswap ([http:*www.blendswap.com/blends/view/69355 ](http:*www.blendswap.com/blends/view/69355)), and exported the scene as an alembic cache. The cache imports into Houdini just fine, but when rendering, it crashed. When I submitted a bug to SideFX, they indicated the curves being generated have invalid vertex counts, and are corrupt. Thanks!

Chris Rydalch commented

2017-01-26 02:59:13 +01:00

Changed status to: 'Open'

Chris Rydalch commented

2017-01-26 02:59:13 +01:00

Added subscriber: @ChrisRydalch

Kévin Dietrich commented

2017-01-30 07:02:05 +01:00

Added subscriber: @kevindietrich

Kévin Dietrich self-assigned this 2017-01-30 07:02:05 +01:00

Kévin Dietrich commented

2017-01-30 07:02:05 +01:00

Sounds like more or less the same issue as in #49114. In any case fixing this without proper knowledge of how other software expects curve data to be written will require a bit of trial and error, so setting priority to Low.

@ChrisRydalch, for reference, if there is more information about the crash there, do you have a link to the Houdini bug report? (Or a screenshot if private.)

Sounds like more or less the same issue as in #49114. In any case fixing this without proper knowledge of how other software expects curve data to be written will require a bit of trial and error, so setting priority to Low. @ChrisRydalch, for reference, if there is more information about the crash there, do you have a link to the Houdini bug report? (Or a screenshot if private.)

Chris Rydalch commented

2017-04-13 15:50:36 +02:00

@kevindietrich I'm so sorry, I somehow missed, or simply forgot about, this issue; please forgive me. The SideFX dev indicated the Alembic export from blender was generating curve meshes with incorrect vertex counts.

Here is the crash output from Mantra (not sure how helpful it'll be, but just in case):

330: Fatal error: Segmentation fault (sent by pid 10)
-- TRACEBACK BEGIN --
Traceback from mantra 16.0.497 (Compiled on linux-x86_64-gcc4.8):
stackTrace() <libHoudiniUT.so>
signalCallback(UTsignalHandlerArg) <libHoudiniUT.so>
UT_Signal::UT_ComboSignalHandler::operator()(int, siginfo*, void*) const <libHoudiniUT.so>
UT_Signal::processSignal(int, siginfo*, void*) <libHoudiniUT.so>
__funlockfile <libpthread.so.0>
void UT_PageArray<void, 1l, true, false, 10l, long>::opUnknownType<0, long>(long, long, long) [clone .constprop.414] <libHoudiniGEO.so>
GA_Topology::wireVertexPoint(long, long) <libHoudiniGEO.so>
(anonymous namespace)::gtutil_GEORefine::makeCurveMesh(GT_PrimCurveMesh const&) <libHoudiniGEO.so>
(anonymous namespace)::gtutil_GEORefine::addPrimitive(GT_Primitive const&) <libHoudiniGEO.so>
GT_Util::makeGEO(UT_Array<GU_Detail*>&, GT_Primitive const&, GT_RefineParms const*, int) <libHoudiniGEO.so>
GT_Util::makeGEO(UT_Array<GU_DetailHandle>&, UT_IntrusivePtr<GT_Primitive> const&, GT_RefineParms const*, int) <libHoudiniGEO.so>
(anonymous namespace)::refineToDetail(VRAY_ProcGT*, UT_IntrusivePtr<GT_Primitive> const&, int, (anonymous namespace)::PackInstanceInfo&, bool, bool&) <libHoudiniRAY.so>
VRAY_ProcGT::renderSimpleInstances(UT_StringHolder const&, UT_IntrusivePtr<GT_Primitive> const&, UT_IntrusivePtr<GT_TransformArray> const&, UT_IntrusivePtr<GT_AttributeList> const&, UT_IntrusivePtr<GT_AttributeList> const&, bool) <libHoudiniRAY.so>
VRAY_ProcGT::renderPrim(UT_IntrusivePtr<GT_Primitive> const&) <libHoudiniRAY.so>
VRAY_ProcGT::renderPrim(UT_IntrusivePtr<GT_Primitive> const&) <libHoudiniRAY.so>
VRAY_Instance::refineProcedural() <libHoudiniRAY.so>
VRAY_Instance::refineProcedural() <libHoudiniRAY.so>
VRAY_Scene::beginRender() <libHoudiniRAY.so>
VRAY_Scene::doRender() <libHoudiniRAY.so>
VRAY_Scene::render() <libHoudiniRAY.so>
VRAY_SceneIO::doRender(CMD_Args&) <libHoudiniRAY.so>
CMD_Manager::runCommand(char*) <libHoudiniPRM.so>
CMD_Manager::internalExecute(char const*) <libHoudiniPRM.so>
CMD_Manager::processInput(CMD_Source*, char const*) <libHoudiniPRM.so>
CMD_Manager::internalSendInput(char const*, bool) <libHoudiniPRM.so>
CMD_Manager::sendInputNoLock(char const*, bool) <libHoudiniPRM.so>
VRAY_Scene::load(UT_IStream&) <libHoudiniRAY.so>
std::basic_streambuf<char, std::char_traits<char> >::uflow() <mantra-bin>
__libc_start_main <libc.so.6>
std::basic_streambuf<char, std::char_traits<char> >::uflow() <mantra-bin>
-- TRACEBACK END --
404: Fatal error: Segmentation fault (sent by pid 256)
-- TRACEBACK BEGIN --
Traceback from mantra 16.0.497 (Compiled on linux-x86_64-gcc4.8):
stackTrace() <libHoudiniUT.so>
signalCallback(UTsignalHandlerArg) <libHoudiniUT.so>
UT_Signal::UT_ComboSignalHandler::operator()(int, siginfo*, void*) const <libHoudiniUT.so>
UT_Signal::processSignal(int, siginfo*, void*) <libHoudiniUT.so>
__funlockfile <libpthread.so.0>
void UT_PageArray<void, 1l, true, false, 10l, long>::opUnknownType<0, long>(long, long, long) [clone .constprop.414] <libHoudiniGEO.so>
GA_Topology::wireVertexPoint(long, long) <libHoudiniGEO.so>
(anonymous namespace)::gtutil_GEORefine::makeCurveMesh(GT_PrimCurveMesh const&) <libHoudiniGEO.so>
(anonymous namespace)::gtutil_GEORefine::addPrimitive(GT_Primitive const&) <libHoudiniGEO.so>
GT_Util::makeGEO(UT_Array<GU_Detail*>&, GT_Primitive const&, GT_RefineParms const*, int) <libHoudiniGEO.so>
GT_Util::makeGEO(UT_Array<GU_DetailHandle>&, UT_IntrusivePtr<GT_Primitive> const&, GT_RefineParms const*, int) <libHoudiniGEO.so>
(anonymous namespace)::refineToDetail(VRAY_ProcGT*, UT_IntrusivePtr<GT_Primitive> const&, int, (anonymous namespace)::PackInstanceInfo&, bool, bool&) <libHoudiniRAY.so>
VRAY_ProcGT::renderSimpleInstances(UT_StringHolder const&, UT_IntrusivePtr<GT_Primitive> const&, UT_IntrusivePtr<GT_TransformArray> const&, UT_IntrusivePtr<GT_AttributeList> const&, UT_IntrusivePtr<GT_AttributeList> const&, bool) <libHoudiniRAY.so>
VRAY_ProcGT::renderPrim(UT_IntrusivePtr<GT_Primitive> const&) <libHoudiniRAY.so>
VRAY_ProcGT::renderPrim(UT_IntrusivePtr<GT_Primitive> const&) <libHoudiniRAY.so>
VRAY_Instance::refineProcedural() <libHoudiniRAY.so>
VRAY_Instance::refineProcedural() <libHoudiniRAY.so>
VRAY_Scene::beginRender() <libHoudiniRAY.so>
VRAY_Scene::doRender() <libHoudiniRAY.so>
VRAY_Scene::render() <libHoudiniRAY.so>
VRAY_SceneIO::doRender(CMD_Args&) <libHoudiniRAY.so>
CMD_Manager::runCommand(char*) <libHoudiniPRM.so>
CMD_Manager::internalExecute(char const*) <libHoudiniPRM.so>
CMD_Manager::processInput(CMD_Source*, char const*) <libHoudiniPRM.so>
CMD_Manager::internalSendInput(char const*, bool) <libHoudiniPRM.so>
CMD_Manager::sendInputNoLock(char const*, bool) <libHoudiniPRM.so>
VRAY_Scene::load(UT_IStream&) <libHoudiniRAY.so>
std::basic_streambuf<char, std::char_traits<char> >::uflow() <mantra-bin>
__libc_start_main <libc.so.6>
std::basic_streambuf<char, std::char_traits<char> >::uflow() <mantra-bin>
-- TRACEBACK END --

Thanks!

@kevindietrich I'm so sorry, I somehow missed, or simply forgot about, this issue; please forgive me. The SideFX dev indicated the Alembic export from blender was generating curve meshes with incorrect vertex counts. Here is the crash output from Mantra (not sure how helpful it'll be, but just in case): ``` 330: Fatal error: Segmentation fault (sent by pid 10) -- TRACEBACK BEGIN -- Traceback from mantra 16.0.497 (Compiled on linux-x86_64-gcc4.8): stackTrace() <libHoudiniUT.so> signalCallback(UTsignalHandlerArg) <libHoudiniUT.so> UT_Signal::UT_ComboSignalHandler::operator()(int, siginfo*, void*) const <libHoudiniUT.so> UT_Signal::processSignal(int, siginfo*, void*) <libHoudiniUT.so> __funlockfile <libpthread.so.0> void UT_PageArray<void, 1l, true, false, 10l, long>::opUnknownType<0, long>(long, long, long) [clone .constprop.414] <libHoudiniGEO.so> GA_Topology::wireVertexPoint(long, long) <libHoudiniGEO.so> (anonymous namespace)::gtutil_GEORefine::makeCurveMesh(GT_PrimCurveMesh const&) <libHoudiniGEO.so> (anonymous namespace)::gtutil_GEORefine::addPrimitive(GT_Primitive const&) <libHoudiniGEO.so> GT_Util::makeGEO(UT_Array<GU_Detail*>&, GT_Primitive const&, GT_RefineParms const*, int) <libHoudiniGEO.so> GT_Util::makeGEO(UT_Array<GU_DetailHandle>&, UT_IntrusivePtr<GT_Primitive> const&, GT_RefineParms const*, int) <libHoudiniGEO.so> (anonymous namespace)::refineToDetail(VRAY_ProcGT*, UT_IntrusivePtr<GT_Primitive> const&, int, (anonymous namespace)::PackInstanceInfo&, bool, bool&) <libHoudiniRAY.so> VRAY_ProcGT::renderSimpleInstances(UT_StringHolder const&, UT_IntrusivePtr<GT_Primitive> const&, UT_IntrusivePtr<GT_TransformArray> const&, UT_IntrusivePtr<GT_AttributeList> const&, UT_IntrusivePtr<GT_AttributeList> const&, bool) <libHoudiniRAY.so> VRAY_ProcGT::renderPrim(UT_IntrusivePtr<GT_Primitive> const&) <libHoudiniRAY.so> VRAY_ProcGT::renderPrim(UT_IntrusivePtr<GT_Primitive> const&) <libHoudiniRAY.so> VRAY_Instance::refineProcedural() <libHoudiniRAY.so> VRAY_Instance::refineProcedural() <libHoudiniRAY.so> VRAY_Scene::beginRender() <libHoudiniRAY.so> VRAY_Scene::doRender() <libHoudiniRAY.so> VRAY_Scene::render() <libHoudiniRAY.so> VRAY_SceneIO::doRender(CMD_Args&) <libHoudiniRAY.so> CMD_Manager::runCommand(char*) <libHoudiniPRM.so> CMD_Manager::internalExecute(char const*) <libHoudiniPRM.so> CMD_Manager::processInput(CMD_Source*, char const*) <libHoudiniPRM.so> CMD_Manager::internalSendInput(char const*, bool) <libHoudiniPRM.so> CMD_Manager::sendInputNoLock(char const*, bool) <libHoudiniPRM.so> VRAY_Scene::load(UT_IStream&) <libHoudiniRAY.so> std::basic_streambuf<char, std::char_traits<char> >::uflow() <mantra-bin> __libc_start_main <libc.so.6> std::basic_streambuf<char, std::char_traits<char> >::uflow() <mantra-bin> -- TRACEBACK END -- 404: Fatal error: Segmentation fault (sent by pid 256) -- TRACEBACK BEGIN -- Traceback from mantra 16.0.497 (Compiled on linux-x86_64-gcc4.8): stackTrace() <libHoudiniUT.so> signalCallback(UTsignalHandlerArg) <libHoudiniUT.so> UT_Signal::UT_ComboSignalHandler::operator()(int, siginfo*, void*) const <libHoudiniUT.so> UT_Signal::processSignal(int, siginfo*, void*) <libHoudiniUT.so> __funlockfile <libpthread.so.0> void UT_PageArray<void, 1l, true, false, 10l, long>::opUnknownType<0, long>(long, long, long) [clone .constprop.414] <libHoudiniGEO.so> GA_Topology::wireVertexPoint(long, long) <libHoudiniGEO.so> (anonymous namespace)::gtutil_GEORefine::makeCurveMesh(GT_PrimCurveMesh const&) <libHoudiniGEO.so> (anonymous namespace)::gtutil_GEORefine::addPrimitive(GT_Primitive const&) <libHoudiniGEO.so> GT_Util::makeGEO(UT_Array<GU_Detail*>&, GT_Primitive const&, GT_RefineParms const*, int) <libHoudiniGEO.so> GT_Util::makeGEO(UT_Array<GU_DetailHandle>&, UT_IntrusivePtr<GT_Primitive> const&, GT_RefineParms const*, int) <libHoudiniGEO.so> (anonymous namespace)::refineToDetail(VRAY_ProcGT*, UT_IntrusivePtr<GT_Primitive> const&, int, (anonymous namespace)::PackInstanceInfo&, bool, bool&) <libHoudiniRAY.so> VRAY_ProcGT::renderSimpleInstances(UT_StringHolder const&, UT_IntrusivePtr<GT_Primitive> const&, UT_IntrusivePtr<GT_TransformArray> const&, UT_IntrusivePtr<GT_AttributeList> const&, UT_IntrusivePtr<GT_AttributeList> const&, bool) <libHoudiniRAY.so> VRAY_ProcGT::renderPrim(UT_IntrusivePtr<GT_Primitive> const&) <libHoudiniRAY.so> VRAY_ProcGT::renderPrim(UT_IntrusivePtr<GT_Primitive> const&) <libHoudiniRAY.so> VRAY_Instance::refineProcedural() <libHoudiniRAY.so> VRAY_Instance::refineProcedural() <libHoudiniRAY.so> VRAY_Scene::beginRender() <libHoudiniRAY.so> VRAY_Scene::doRender() <libHoudiniRAY.so> VRAY_Scene::render() <libHoudiniRAY.so> VRAY_SceneIO::doRender(CMD_Args&) <libHoudiniRAY.so> CMD_Manager::runCommand(char*) <libHoudiniPRM.so> CMD_Manager::internalExecute(char const*) <libHoudiniPRM.so> CMD_Manager::processInput(CMD_Source*, char const*) <libHoudiniPRM.so> CMD_Manager::internalSendInput(char const*, bool) <libHoudiniPRM.so> CMD_Manager::sendInputNoLock(char const*, bool) <libHoudiniPRM.so> VRAY_Scene::load(UT_IStream&) <libHoudiniRAY.so> std::basic_streambuf<char, std::char_traits<char> >::uflow() <mantra-bin> __libc_start_main <libc.so.6> std::basic_streambuf<char, std::char_traits<char> >::uflow() <mantra-bin> -- TRACEBACK END -- ``` Thanks!

Sybren A. Stüvel commented

2019-08-22 17:42:30 +02:00

Added subscriber: @dr.sybren

Sybren A. Stüvel commented

2019-08-22 17:42:31 +02:00

@ChrisRydalch Can you check whether this is still an issue with a daily build of Blender? I don't have Houdini here, so I can't check for myself. I tried exporting a NURBS surface and opening in Gaffer, and that doesn't show anything. However, I don't even know whether Gaffer even supports loading NURBS surfaces...

@ChrisRydalch Can you check whether this is still an issue with a [daily build](https://builder.blender.org/download/) of Blender? I don't have Houdini here, so I can't check for myself. I tried exporting a NURBS surface and opening in Gaffer, and that doesn't show anything. However, I don't even know whether Gaffer even supports loading NURBS surfaces...

Sybren A. Stüvel commented

2019-08-22 17:42:45 +02:00

Closed as duplicate of #49114

Sybren A. Stüvel closed this issue

2019-08-22 17:42:45 +02:00

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Invalid curves from exported alembic cache #50529