Hi guys, hope you're well. Turbo Tools version 3.0.8 has just been released. If you already own a copy then all updates are free for life, so you can find it waiting for you in your download area.

The changes include:

New problem solving section in the Turbo Render panel, that can automatically resolve two common Cycles issues. IMPORTANT - they should NOT be enabled unless there's a problem, because they will impact the render time and glossy levels negatively if the issues aren't present.

The two options are:

swirly/blotchy artefacts.

There's currently an issue with Blender's adaptive sampling, which under some circumstances can create swirly patterns due to stopping sampling too early. AI denoisers consider the patterns intentional, so don't remove them during denoising:

This option disables Blender's adaptive sampling, which may lead to longer render times. So before enabling, it's better to try one of the following:

enabling the 'interior/heavy GI' option
lowering the sample pre-set setting
setting the sample pre-set to 'user' and then trying your own min and max samples (the higher the min samples the less likely it is to happen, but sometimes it's impossible to avoid without disabling the adaptive sampling altogether).

bright pixels after denoising

When a scene contains a volume in combination with very bright shader values and/or bright lights, the render may suddenly develop very bright artefacts on the glossy areas once the denoising phase completes. This is caused by the volume scattering rays so sparsely that the individual passes end up having very bright pixels sparsely placed between dark areas. The denoisers consider them intentional, and because the passes get denoised individually, this can lead to amplification once the passes are re-combined to produce the final image.

Enabling the option will denoise the glossy passes in SDR instead of HDR, which should resolve the issue. If this negatively impacts glossy levels, then alternative approaches are:

Select the volume, and then turn off diffuse and shadows in the visibility section of the object properties panel. This will stop the volume scattering the rays so sparsely.
Render the volume in a separate scene and recombine in the compositor with mix a node.

That's it for this update.

Cheers
Michael
3d-illusions.co.uk

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