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Maniphest T50529

Invalid curves from exported alembic cache
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Description

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!

Related Objects

Event Timeline

Chris Rydalch (goldleaf) created this task.Jan 26 2017, 2:59 AM
Kévin Dietrich (kevindietrich) claimed this task.Jan 30 2017, 7:02 AM
Kévin Dietrich (kevindietrich) lowered the priority of this task from 90 to Low.
Kévin Dietrich (kevindietrich) added a subscriber: Kévin Dietrich (kevindietrich).

Sounds like more or less the same issue as in T49114. 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.

@Chris Rydalch (goldleaf), 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.)

Sybren A. Stüvel (sybren) added a project: Alembic.Apr 13 2017, 3:36 PM
Chris Rydalch (goldleaf) added a comment.Apr 13 2017, 3:50 PM

@Kévin Dietrich (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 (sybren) raised the priority of this task from Low to 30.Aug 22 2019, 5:42 PM
Sybren A. Stüvel (sybren) added a subscriber: Sybren A. Stüvel (sybren).

@Chris Rydalch (goldleaf) 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...

Sybren A. Stüvel (sybren) closed this task as a duplicate of T49114: Exporting curves to Alembic crashes other software when reading.Aug 22 2019, 5:42 PM