feature: before/after slider

[tlambert03]

talking with @fjug: we should have a little interactive handle on the canvas that you can slider to see image A / image B... for before/after comparisons

[gselzer]

Can you elaborate on what this means? Two different datasets?

[tlambert03]

one of these things:

in practice, it would likely mean having two canvases, primed with either two different datasets, or the same dataset but with different display/slicing settings, with a canvas object that the user can interact with that apply's clipping planes to the scenes

(it would not be a trivial feature)

[gselzer]

Ah, gotcha, that makes much more sense. Thanks!

in practice, it would likely mean having two canvases...

Hmm, would one canvas make things easier? Might be better performance, less signal traffic, and easier pan/zoom...

[tlambert03]

Hmm, would one canvas make things easier?

yes, sorry, you're absolutely right, I misspoke. one canvas, one scene even. two textures with clipping planes