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Im sure there is a way to use an other shader for the viewport like here in maya.
https://www.youtube.com/watch?v=NBAX6udI4LA
you would have to create shader that links textures/colors to ogl values on your shader. Just look how procedural shader is done. Bunch of texture slots are linked to ogl values.
@Lee Griggs Hi! it is possible in the moment, to see arnold textures in viewport like in maya?