Error: rtrace: warning - no GPU support for brightdata

[agc...@gmail.com]

Has anyone come across the following error:

rtrace: warning - no GPU support for brightdata


If so, some assistance would be most welcomed, many thanks

[Nathaniel Jones]

Any *data or *func object depends on a .cal file, which unfortunately aren't readable by the GPU. Instead, .cal files have to be individually translated to GPU-readable code by hand. According to the Accelerad documentation, brightdata is currently only implemented for the functions corr, flatcorr, boxcorr, and cylcorr from source.cal (you can hover over the box to see the list. In order to implement your function, I would need to see the next three lines of the error message, which contain the object data, and preferably also a reproducing .rad file.

Nathaniel

[agc...@gmail.com]

Thanks for the prompt reply.

The full error is as follows:

**************
*** PID  9480: rtrace -I -h -dp 64 -ds 0.5 -dt 0.5 -dc 0.25 -dr 0 -st 0.85 -lr 4 -lw 0.05 -ab 2 -ad 1000 -as 128 -ar 300 -aa 0.1 -e error.log unnamed_RAD.oct

OptiX 3.9.1 found driver 8.0.0 and 1 GPU device:
Device 0: GeForce GT 755M with 2 multiprocessors, 1024 threads per block, 1085000 kHz, 1073741824 bytes global memory, 128 hardware textures, compute capability 3.0, timeout disabled, Tesla compute cluster driver disabled, cuda device 0.

rtrace: warning - no GPU support for brightdata "c0d9fa29-8d31-4ae8-894e-4cabbf0da8ef_dist"
 void(-1) brightdata(24) c0d9fa29-8d31-4ae8-894e-4cabbf0da8ef_dist(16)
 17 flatcorr C:\Users\admin.login\AppData\Roaming\Ladybug\ies\72865000_V05/c0d9fa29-8d31-4ae8-894e-4cabbf0da8ef.dat source.cal src_phi2 src_theta -i 1 -rz 0.0 -ry -35.0 -rz 0.0 -t -13.395 16.2503 6.3222
 1 61.0352
rtrace: warning - no GPU support for brightdata "c0d9fa29-8d31-4ae8-894e-4cabbf0da8ef_dist"
 void(-1) brightdata(24) c0d9fa29-8d31-4ae8-894e-4cabbf0da8ef_dist(19)
 17 flatcorr C:\Users\admin.login\AppData\Roaming\Ladybug\ies\72865000_V05/c0d9fa29-8d31-4ae8-894e-4cabbf0da8ef.dat source.cal src_phi2 src_theta -i 1 -rz 0.0 -ry -35.0 -rz 0.0 -t -13.395 14.242 6.3222
 1 61.0352
rtrace: warning - no GPU support for brightdata "11eee02f-c06d-41b4-8f2e-4598b49b86e4_dist"
 void(-1) brightdata(24) 11eee02f-c06d-41b4-8f2e-4598b49b86e4_dist(22)
 17 flatcorr C:\Users\admin.login\AppData\Roaming\Ladybug\ies\72865000_V05/11eee02f-c06d-41b4-8f2e-4598b49b86e4.dat source.cal src_phi2 src_theta -i 1 -rz 180.0 -ry -140.0 -rz 0.0 -t -13.395 16.2503 6.3222
 1 61.0352
rtrace: warning - no GPU support for brightdata "11eee02f-c06d-41b4-8f2e-4598b49b86e4_dist"
 void(-1) brightdata(24) 11eee02f-c06d-41b4-8f2e-4598b49b86e4_dist(25)
 17 flatcorr C:\Users\admin.login\AppData\Roaming\Ladybug\ies\72865000_V05/11eee02f-c06d-41b4-8f2e-4598b49b86e4.dat source.cal src_phi2 src_theta -i 1 -rz 180.0 -ry -140.0 -rz 0.0 -t -13.395 14.242 6.3222
 1 61.0352
rtrace: warning - no GPU support for brightdata "9a368c03-578d-45d4-a848-d39e34b06d9a_dist"
 void(-1) brightdata(24) 9a368c03-578d-45d4-a848-d39e34b06d9a_dist(28)
 17 flatcorr C:\Users\admin.login\AppData\Roaming\Ladybug\ies\72865000_V05/9a368c03-578d-45d4-a848-d39e34b06d9a.dat source.cal src_phi2 src_theta -i 1 -rz 0.0 -ry -35.0 -rz 180.0 -t -5.275 14.242 6.3222
 1 61.0352
rtrace: warning - no GPU support for brightdata "9a368c03-578d-45d4-a848-d39e34b06d9a_dist"
 void(-1) brightdata(24) 9a368c03-578d-45d4-a848-d39e34b06d9a_dist(31)
 17 flatcorr C:\Users\admin.login\AppData\Roaming\Ladybug\ies\72865000_V05/9a368c03-578d-45d4-a848-d39e34b06d9a.dat source.cal src_phi2 src_theta -i 1 -rz 0.0 -ry -35.0 -rz 180.0 -t -5.275 16.2503 6.3222
 1 61.0352
rtrace: warning - no GPU support for brightdata "f2433a6f-e4ea-497a-a988-0d1119aa8b7f_dist"
 void(-1) brightdata(24) f2433a6f-e4ea-497a-a988-0d1119aa8b7f_dist(34)
 17 flatcorr C:\Users\admin.login\AppData\Roaming\Ladybug\ies\72865000_V05/f2433a6f-e4ea-497a-a988-0d1119aa8b7f.dat source.cal src_phi2 src_theta -i 1 -rz 180.0 -ry -140.0 -rz 180.0 -t -5.275 14.242 6.3222
 1 61.0352
rtrace: warning - no GPU support for brightdata "f2433a6f-e4ea-497a-a988-0d1119aa8b7f_dist"
 void(-1) brightdata(24) f2433a6f-e4ea-497a-a988-0d1119aa8b7f_dist(37)
 17 flatcorr C:\Users\admin.login\AppData\Roaming\Ladybug\ies\72865000_V05/f2433a6f-e4ea-497a-a988-0d1119aa8b7f.dat source.cal src_phi2 src_theta -i 1 -rz 180.0 -ry -140.0 -rz 180.0 -t -5.275 16.2503 6.3222
 1 61.0352
Geometry build time: 387 milliseconds for 40 objects.
OptiX kernel time: 120 milliseconds (0 seconds).
Adaptive sampling: 20 milliseconds.
Retrieved 11253 of 11253 potential seeds at level 0.
K-means performed 3 loop iterations in 76 milliseconds.
K-means produced 4096 of 4096 clusters at level 0.

OptiX kernel time: 62 milliseconds (0 seconds).
Retrieved 647803 of 1982464 potential seeds at level 1.
K-means performed 5 loop iterations in 10584 milliseconds.
K-means produced 4096 of 4096 clusters at level 1.

OptiX kernel time: 30 milliseconds (0 seconds).
OptiX kernel time: 787 milliseconds (1 seconds).
Retrieved 4096 ambient records from 4096 queries at level 1.


When I remove artificial luminaires in the scene the error is now :


rpict: internal - Unknown error (Details: Function "_rtContextLaunch2D" caught exception: Insufficient device memory. GPU does not support paging., [16515529])
(D:\nljones\Radiance\src\rt\optix_util.c:120)
rpict: 0 rays, 0.00% after 0.0014 hours

[Nathaniel Jones]

It looks like the problem is coming from "src_phi2". Currently, Accelerad supports IES files that wrap the entire luminaire (with "src_phi"), but not those that use mirroring (with "src_phi2" or "src_phi4").

As for the "insufficient device memory" error, it's odd to me that you don't also see that error when you run with the artificial luminaries. Is it for the same model? Is the model very complex? The GT 755M you're running on doesn't have particularly high specs, so perhaps it is just running out of memory.

Nathaniel

[Paul Tarand]

Hi Nathaniel,

Any suggestions on how to find an IES file with "src_phi" function online?

I have been struggling to find one, and get my lights working with Accelerad.

Many thanks,

Paul 

[Nathaniel Jones]

Hi Paul,

This thread is old. Support for "src_phi2" and "src_phi4" was added to Accelerad back in 2017 with version 0.6 beta. Please make sure you are using the latest version of Accelerad.

Nathaniel

[Paul Tarand]

Hi Nathaniel,

Thanks for your reply. This tip resolved my issue so thanks for that too.

Could you please recommend a resource for learning to simulate artificial light sources like a pro with Radiance? 

Kind regards,

Paul

[Nathaniel Jones]

Hi Paul,

I would suggest reading Rendering with Radiance if you haven't already, and using the Radiance Discourse forum for any questions you have on the topic.

Nathaniel