possible error in transfer function underflow on AMD GPUs

ComputationalRadiationPhysics / isaac

In Situ Animation of Accelerated Computations :microscope:

http://ComputationalRadiationPhysics.github.io/isaac/

GNU Lesser General Public License v3.0

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possible error in transfer function underflow on AMD GPUs #173

Closed PrometheusPi closed 1 year ago

PrometheusPi commented 1 year ago

We have a possible clipping error, when the data to viuslize has an underflow in the transfer function, the rendered colors are those of the overflow. This seems to be AMD GPU specific.

observed on ORNL frontier using PIConGPU
not observed on HZDR hemera v100
[ ] cross check correctness on NVIDA GPU

grafik

PrometheusPi commented 1 year ago

Possible fix in #174

PrometheusPi commented 1 year ago

closed with #174