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better controls for volume rendering volumes with small scalar ranges #3128
When loading an image that has a small scalar range (e.g., this MRHead image rescaled to 0.0-1.0 range) then Shift slider in volume rendering module has incorrect min/max range by default (very large range compared to the scalar range of the volume). The range is fixed when transfer functions are modified (e.g., any of the points are moved in scalar opacity transfer function).
Probably an initial update of the slider range is missing.