VolumeData::AttachVolumeDataFake() in latest C4D 2024 API

[fwilleke80]

Hi,
I noticed that, with the last C4D 2024 update, VolumeData::AttachVolumeDataFake() has two new parameters: Int32 fakeCurrentThreadIdx and Int32 fakeThreadCount. These are not documented, and not shown in the code snippet.

Are these to fix the known issues with sampling a BaseShader from multiple threads (https://developers.maxon.net/forum/topic/12521/sample-a-shader-in-3d-space/15?_=1702535567135)? Will they allow me to sample multi-threaded again? What if I don't want to rewrite that code and decide to just continue sampling my shader single-threaded, do I just have to pass 0 as fakeCurrentThreadIdx and 1 as fakeThreadCount?

Cheers,
Frank

[m_adam]

Hi frank, thanks for reporting, documentation will be adjusted.

• fakeCurrentThreadIdx: Previously this value was stored in renderdata.RDATA_VDFAKE_CURRENTTHREAD. Now the parameter is passed directly for speedup.
• fakeThreadCount: Previously this value was stored in renderdata.RDATA_VDFAKE_THREADCOUNT. Now the parameter is passed directly for speedup.

So it's only for speedup reason it does not fix your issue with TexData.

@fwilleke80 said in VolumeData::AttachVolumeDataFake() in latest C4D 2024 API:

What if I don't want to rewrite that code and decide to just continue sampling my shader single-threaded, do I just have to pass 0 as fakeCurrentThreadIdx and 1 as fakeThreadCount?

Correct.

Cheers,
Maxime.

[fwilleke80]

Super, thank you!