GrowCutGenerator does not work for a single slice.

[JamesAPetts]

I've observed that GrowCut does not work for a single slice, the labelmap/strengthmaps do not change between iterations. I assume this is because the center is [x/2,y/2,0], and the latter coordinate means that no fragment in the shader pases this block:?

ohif-step/src/GrowCutGenerator.js

Line 87 in 93e3584

if (any( lessThan( neighborIndex, ivec3(0,0,0) ) ) ||

It must be a flooring issue, but I would expect the value in the shader to be 0.5 in the z direction for all voxels in the single frame sized texture any ideas @pieper?

Do we need a special 2D routine to deal with this edge case?
This is likely true for the core step library also.

[pieper]

I would have thought that loop would still work - the line you linked would just continue for the out-of-plane neighbors but the rest ought to work.

Maybe it's this line - the size might end up as (columns, rows, 0) but it should be (columns, rows, 1)

ohif-step/src/GrowCutGenerator.js

Line 61 in 93e3584

ivec3 texelIndex = ivec3(floor(interpolatedTextureCoordinate * vec3(size)));

[JamesAPetts]

Good spot, that could be it.