Re: [MtoA] User Data + alHair crashes Arnold

[Anders Langlands]

I'll take a look this afternoon but I'm 99% certain it's because the normal contains negative values.

Can you try compressing the normal to 0-1 (add 1 and multiply by 0.5 with alCombine nodes) and see if this fixes it?

Obviously it shouldn't crash, but the only way j can make this work internally is by clipping, which probably isn't what you want do you'd need to do the compression anyway.

Cheers,

Anders.

On Wed, 3 Dec 2014 at 11:48 Sachin Shrestha <sshr...@pranastudios.com> wrote:

I can't seem to use user data nodes with alHair for picking up my custom data. I'm trying to use the skin normal data in our hair ass file with a user vector data node and connecting it to alHair's fibre color but that crashes Arnold during render. The same workflow renders fine with another shader like aiUtility. I have attached a simple repro package with 2 render layers - aiUtility with a vector data node picking up our skin_normal for the flat color mode. This renders okay. The 2nd render layer with alHair crashes. Is this not supported?

Maya 2014 + MtoA 1.1.2.1 with Arnold Core 4.2.2.0

alShaders 0.4.0b18-ai4.2.0.6 (have not tried with last night's release)

Centos 6.4

Here's the backtrace log that Arnold prints:

****
* Arnold 4.2.2.0 linux clang-3.4.0 glibc-2.5 oiio-1.4.14 rlm-11.1.2 2014/11/03 15:27:58
* CRASHED in DualScattering::getLut at 00:00:00, pixel (120, 184)
* signal caught: SIGSEGV -- Invalid memory reference (address not mapped to object)
*
* backtrace:
*  0 0x00002ac4e94648a8 [libai.so       ]                                                        
*  1 0x0000003548c3291f [libc.so.6      ]                                                        
>> 2 0x00002ac4ebf55874 [alHair.so      ] DualScattering::getLut(float, ScatteringParams const&) [Color.cpp            :0]
*  3 0x00002ac4ebf55874 [alHair.so      ]                                                        [Color.cpp            :0]
*  4 0x00002ac4ebf5a770 [alHair.so      ] DualScattering::getLut(float, ScatteringParams const&) [Color.cpp            :0]
*  5 0x00002ac4ebf4f872 [alHair.so      ]                                                        [alHair.cpp           :0]
*  6 0x00002ac4e92d0684 [libai.so       ] AiShaderEvaluate                                       
*  7 0x00002ac4e9443871 [libai.so       ]                                                        
*  8 0x00002ac4e92cc128 [libai.so       ] AiShaderEvalParamFuncRGBA                              
*  9 0x00002ac4ea2b30e3 [mtoa_shaders.so] Evaluate(AtNode*, AtShaderGlobals*)                    [MayaShadingEngine.cpp:0]
* 10 0x00002ac4e92d0684 [libai.so       ] AiShaderEvaluate                                       
* 11 0x00002ac4e9289016 [libai.so       ]                                                        
* 12 0x00002ac4e92c73dc [libai.so       ] AiTrace                                                
* 13 0x00002ac4e9437da0 [libai.so       ]                                                        
* 14 0x00002ac4e9440f1a [libai.so       ]                                                        
* 15 0x00002ac4e9467185 [libai.so       ]                                                        
* 16 0x0000003549407850 [libpthread.so.0]                                                        [pthread_create.c     :0]
* 17 0x0000003548ce890c [libc.so.6      ] clone                                                  
*
* loaded modules:
*    0x00002ac4e9204000  libai.so
*    0x0000003548c00000  libc.so.6
*    0x00002ac4ebf4b000  alHair.so
*    0x00002ac4ea2a4000  mtoa_shaders.so
*    0x0000003549400000  libpthread.so.0
*
* memory: VM 278 MB, RSS 53 MB, 1 page faults
****

Thanks & Regards,
___________________________________________________________________

Sachin Shrestha

sshr...@pranastudios.com <mailto:sshr...@pranastudios.com>

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[Anders Langlands]

I'll take a look into it, the trouble is that I don't want to be calling AiMessage constantly. I'll clip the values to fix the crash and then see what to do about warnings.

On 3 December 2014 at 12:32, Sachin Shrestha <sshr...@pranastudios.com> wrote:

That indeed fixed the problem! Could alHair clip the values but report it in the logs so that users can then fix it?

Cheers,

___________________________________________________________________

Sachin Shrestha

sshr...@pranastudios.com <mailto:sshr...@pranastudios.com>

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From: mt...@solidangle.com <mt...@solidangle.com> on behalf of Anders Langlands <andersl...@gmail.com>
Sent: Wednesday, December 3, 2014 5:42 PM
To: Arnold Maya; alsh...@googlegroups.com
Subject: Re: [MtoA] User Data + alHair crashes Arnold