# Multi-volume rendering bug

**URL:** <https://discourse.slicer.org/t/multi-volume-rendering-bug/13939>\
**Category:** Support\
**Created:** [October 8, 2020, 6:19pm UTC](https://discourse.slicer.org/t/multi-volume-rendering-bug/13939 "2020-10-08T18:19:32Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [October 9, 2020, 4:38am UTC](https://discourse.slicer.org/t/multi-volume-rendering-bug/13939/7 "2020-10-09T04:38:20Z")

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I agree, it’s very annoying. The ctkDoubleSpinBox widget tries to be smart, but enforcing valid input during typing (after each keypress) is just so hard, probably in many cases it is not even feasible. See also [this discussion](https://discourse.slicer.org/t/slicer-roi-dimensions-input-numbers-autofill/12773/6). We should probably only validate values on Enter/leave.

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