Orientation coefficients: per-grain sinogram values at the current beam pixel, sorted by weight. Detector image updates 0.5 s after slider moves.
The object x is a polycrystal with K grains. Each pixel carries a weight vector of length K — the orientation distribution in that voxel.
The tomographic operator P projects each basis-function image along the pencil beam at angle φ and translation t, yielding one reading per (φ, t) pair — a point in the sinogram Px.
Switch to Grain k mode and slide through grains to see how each basis function's sinogram uses a black→grain-color scale. The highlighted pixel marks the current beam position.