geom

Geometry transforms to and from laboratory, detector, and sample frames.

Functions

beam_basis(k_in_lab)	Return unit vectors along a beam and across it, horizontally and vertically, in the lab frame.
det_to_lab(sc, fc, det_trans, ...)	Convert detector (sc, fc) coordinates to lab (lx, ly, lz) coordinates.
detector_basis_vectors_lab(det_trans, ...)	Get the detector's pixel steps and pixel (0, 0) position in the laboratory frame.
detector_orientation_matrix(o11, o12, o21, o22)	Return a matrix that transforms detector (slow, fast) pixel values to (z_det, y_det).
detector_rotation_matrix(tilt_x, tilt_y, tilt_z)	Return a 3D orientation matrix that transforms a point in the detector reference frame to the lab frame.
detector_transforms(y_center, y_size, ...)	Return all transformations required to convert from detector pixel to lab space.
dty_and_origin_lab(v_sample, k_in_lab, ...)	Find the dty that brings v_sample into the beam, and the lab position it then occupies.
find_dty_for_beam_xy(v_sample, k_in_lab, ...)	Find the dty value required to make the beam intersect a specific point v_sample at a given omega.
lab_to_det(xl, yl, zl, det_trans, ...)	Convert lab (lx, ly, lz) coordinates to detector (sc, fc) coordinates.
lab_to_sample(v_lab, omega, wedge, chi, dty, y0)	Convert from lab to sample coordinates (apply the diffractometer stack).
raytrace_to_det(vec_lab, origin_lab, ...)	Ray-trace from vector in lab frame (unknown length) to detector coordinates (sc, fc).
recon_positions(n, step)	Sample-frame positions of every voxel of an n x n reconstruction grid, in reconstruction order.
recon_to_step(ri, rj, recon_shape)	Convert rotation space (origin in corner) to step space (integer steps leading from rotation axis).
rmat_from_axis_angle(axis, angle)	Return rotation matrix for positive right-handed rotation about axis by angle (degrees).
rot_x(angle)	Return rotation matrix for positive right-handed rotation about the X axis by angle (degrees).
rot_y(angle)	Return rotation matrix for positive right-handed rotation about the Y axis by angle (degrees).
rot_z(angle)	Return rotation matrix for positive right-handed rotation about the Z axis by angle (degrees).
sample_to_lab(v_sample, omega, wedge, chi, ...)	Convert from sample to lab coordinates (apply the diffractometer stack).
sino_shift_and_pad(y0, ny, ymin, ystep)	Shift and padding that centre a sinogram of ny dty rows on the rotation axis, as ImageD11 does.
step_grid_from_ybincens(ybincens, step_size, ...)	Create reconstruction grid in "step" space (integer units of the step size).
step_to_recon(si, sj, recon_shape)	Convert step space (integer steps leading from rotation axis) to rotation space (origin in corner).
step_to_sample(si, sj, ystep)	Convert step space (integer steps leading from rotation axis) to sample space.