Warning Num Samples Per Thread Reduced To 32768 Rendering Might Be Slower

If your code or the library requests a larger batch size (e.g., for better vectorization), the driver silently caps it.

When your 3D scene demands more graphic memory than your graphics card can physically provide, V-Ray dynamically scales down its ray-tracing sample allocation per execution thread to prevent an outright system crash or Out-Of-Memory (OOM) error. While this automated safety mechanism saves your progress, it changes how calculations are batched, often triggering a massive jump in render times. Why the Warning Triggers: VRAM Bottlenecks

Set an optimal tile size (e.g., 256x256 or 512x512 for modern GPUs). If your code or the library requests a larger batch size (e

Decrease the "Max Subdivision" level for displacement maps. 4. Address TDR (Windows Only)

A pause. “Eighty percent.”

If you have set your global samples to an extremely high number (e.g., 64k or higher) without using Adaptive Sampling, the engine may attempt to push too much data through a single thread.

The software has reduced this value, likely because the scene is too complex for the current settings, leading to potential stability issues (like TDR crashes) or inefficient GPU memory usage. Why the Warning Triggers: VRAM Bottlenecks Set an

Instead of letting the software auto-reduce it, explicitly set a lower number (like 32768, or even lower, e.g., 16384) in the Kernel settings to see if it stabilizes, which can often be faster than the auto-reduction mechanism. 2. Optimize Scene Complexity

Blender will automatically stop rendering clean areas of the image early, dedicating processing power only to noisy shadows or reflections. 2. Utilize Modern Denoisers Address TDR (Windows Only) A pause

int getActiveSamples() return samplesPerThread;