Changeset 7e6bc45e in sasmodels for doc/guide/plugin.rst
- Timestamp:
- Dec 20, 2017 12:33:39 PM (6 years ago)
- Branches:
- master, core_shell_microgels, magnetic_model, ticket-1257-vesicle-product, ticket_1156, ticket_1265_superball, ticket_822_more_unit_tests
- Children:
- 06ee63c
- Parents:
- 93fbc34
- File:
-
- 1 edited
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doc/guide/plugin.rst
rc654160 r7e6bc45e 538 538 If the scattering is dependent on the orientation of the shape, then you 539 539 will need to include *orientation* parameters *theta*, *phi* and *psi* 540 at the end of the parameter table. Shape orientation uses *a*, *b* and *c* 541 axes, corresponding to the *x*, *y* and *z* axes in the laboratory coordinate 542 system, with *z* along the beam and *x*-*y* in the detector plane, with *x* 543 horizontal and *y* vertical. The *psi* parameter rotates the shape 544 about its *c* axis, the *theta* parameter then rotates the *c* axis toward 545 the *x* axis of the detector, then *phi* rotates the shape in the detector 546 plane. (Prior to these rotations, orientation dispersity will be applied 547 as roll-pitch-yaw, rotating *c*, then *b* then *a* in the shape coordinate 548 system.) A particular *qx*, *qy* point on the detector, then corresponds 549 to *qa*, *qb*, *qc* with respect to the shape. 550 551 The oriented C model is called as *Iqabc(qa, qb, qc, par1, par2, ...)* where 540 at the end of the parameter table. As described in the section 541 :ref:`orientation`, the individual $(q_x, q_y)$ points on the detector will 542 be rotated into $(q_a, q_b, q_c)$ points relative to the sample in its 543 canonical orientation with $a$-$b$-$c$ aligned with $x$-$y$-$z$ in the 544 laboratory frame and beam travelling along $-z$. 545 546 The oriented C model is called using *Iqabc(qa, qb, qc, par1, par2, ...)* where 552 547 *par1*, etc. are the parameters to the model. If the shape is rotationally 553 548 symmetric about *c* then *psi* is not needed, and the model is called
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