Blender materials have scattered options for shadows. Disabling shadow casting ONLY is not possible for ray tracing.

Only buffer shadows and aproximate shadows can be turned on and off. Ray traced shadows can only be turned off by enabling/disabling "traceable".

The traceable option controls more then just shadow casting, it controlls reflections as well. Traceable is intended as a time saver to disable rayracing for materials that dont need it. Its not a means for controlling shadows.

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