I have read and made sure CUDA: Rhino - GPU and CPU Rendering
But when calling RhinoCore, it found that the GPU is still not used, I missed something?
How are you calling RhinoCore? Programmatically?
If you mean Rhino Render using the _Render command then you need to check in Tools > Options > Cycles to see if your GPU is selected (assuming you have a supported GPU).
I access RhinoCore programmatically, which is Rhino Compute
I don’t know if rendering is possible with Rhino Compute. If it is then in theory it should be possible for it to use the GPU as well. CUDA GPUs will be automatically used if supported and available.