GPU lightmapping fails in 2019.3.0b10

[hasseyg]

Hi, when I try and bake a large scene using the GPU lightmapper, it fails and switches to CPU with the error: CL_MEM_OBJECT_ALLOCATION_FAILURE error executing CL_COMMAND_NDRANGE_KERNEL.
I am using an RTX 2060 Super and I have the lightmap size set to 2048. It fails after it has got more than half way. Is anyone else getting a similar problem?

thanks

[LeonhardP]

@KEngelstoft

If you don’t have more than 8GB of GPU memory, go with 1K maps and you should have a much better time with the GPU lightmapper.

[mgear]

also this topic,
gpu baking fails on pretty much any size (at least with many lightprobe groups)

Max allocation is 2.75 GB on a 11GB GPU

Yes, some improvements landed already but there are more improvements coming, we are not quite there yet… I have a feature in flight for 2020.x that makes it unnecessary to disable the Light Probe groups. Another one makes larger lightmaps viable. We are testing on the archviz6 scene ourselves and I know that the scene in the Editor itself takes up quite a lot of memory. A short term solution: if you have a second GPU you can run the Editor on one and the GPU lightmapper on the 2nd. This way t…

[hasseyg]

Hi, I found out through trial and error that moving the viewport during GPU baking made it fail, as well as did having the viewport show the entire large scene. So I zoomed into one object and let it GPU bake without touching the editor window and it finally completed successfully. This was using a lightmap size of 2048. In my case I had 68 lightmaps of this size. I also found that everytime I wanted to do a new GPU bake I would have to close and restart the editor otherwise the mrays per second were drastically lower.

thanks

[KEngelstoft]

@mgear

also this topic,
gpu baking fails on pretty much any size (at least with many lightprobe groups)
https://discussions.unity.com/t/750126/8

The many light probes memory issue is fixed in 2020.1.0a15.

[CosmosBear1]

It fail 100% when I’m working with 3ds max at the same time with 2019.3.b11. It was fine with 2019.3.b7 tough it might be both my documents are bigger and I reached the treshold when it’s too much for gpu mem. (I have a 2060RTX too)
It’s very annoying…
If unity could somehow fix it, either by pausing the rendering and notifying you instead of just reverting to cpu and loose everything or something that would be great!