Thank you for your detailed and professional answer.
I believe the explicit ray query is answer I would like to have, I’ll look into the vulkan ray tracing for more detailed information.
And since you’ve mentioned the consistency of CPU&GPU rendered pixels, I’ve got another question about it. I’m just new to OptiX and what I’ve learned is that the user have ray generator and integrator calculation in full control, and for the shading part I’m using OSL(which will have PTX callable support for the GPU part). What else could possibly cause the difference between CPU & GPU rendered pixel? Sampling of random numbers? Precision of intersection results?