mayaplugin: maya 2018 needs namespace

[takahito-tejima]

Description of Issue

since maya 2018, OpenMaya API classes have a namespace prefixed such as OpenMaya20180000::MFnMesh
which results in a build error when compiling maya plugin.

Steps to Reproduce

1. build usd with maya support using maya 2018 or later

System Information (OS, Hardware)

windows, linux

Package Versions

Build Flags

--maya

modifying forward declarations in usdMaya/meshUtil.h as

#include <maya/MTypes.h>
#if MAYA_API_VERSION >= 20180000
OPENMAYA_MAJOR_NAMESPACE_BEGIN
class MFnMesh;
class MString;
OPENMAYA_NAMESPACE_CLOSE
#else
class MFnMesh;
class MString;
#endif

fixes for me.

thanks!

[jtran56]

Filed as internal issue #149756.

[bfloch]

Thanks for the hint, @takahito-tejima

For us the compiler was not quite happy until we did this:

#include <maya/MTypes.h>                 
#if MAYA_API_VERSION >= 20180000         
#include <maya/MApiNamespace.h>          
#else                        
class MFnMesh;                           
class MString;                           
#endif      

At least in the current devkit their namespace header does declare all classes with the proper namespaces. This seems to be the preferred way according to the docs:

http://help.autodesk.com/view/MAYAUL/2018/ENU/?guid=__files_GUID_C122F8DA_431C_4094_BA54_60B80495A734_htm

---

In case someone is doing the build and has issues with Ptex:
Before 2018 we used to link against maya's ptex but now they introduce a namespace like:

Ptex::v2_2::PtexTexture::open(char const*, std::string&, bool) 

We do not have matching headers and since it probably is not a version usd expects we ended up rebuilding Ptex statically with -fPIC and linking the maya variant against the static lib.

Other then this pxrUsd seems to run fine.

Hope someone might find this helpful.

[mattyjams]

Hi all,

@mrawde took care of this with commit af3c97b which is available in the dev branch now. It should be in the next release on master soon.

Let us know if you have any more trouble here. Thanks!

-Matt

[bfloch]

Thanks for taking care.

I would like to add some info to Ptex issue:

It seems that the v2_2 namespace was introduced with Ptex 2.1.28.
In their 2018.1 changelog Autodesk mentions this update explicitly, but to our best knowledge it already is included in Maya 2018.

So as long as usd can be build with Ptex 2.1.28 you will be able to use Maya's PTex library.

[sunyab]

Commit af3c97b was just released in USD 0.8.1, closing this out. Thanks!