FAQ-мраки

[lynx_vilnensis]

А не ввести ли мне ещё один тэг, что-нибудь вроде мракограммирование в добавок к алгорифметике? А то клиенты кустятся и зреют, на всех не хватает. Из хороших новостей - меня активно процитировали в прошлом году, а я и не заметил! Из плохих новостей -

Q: What if I want to make a new geometry?
A: Write a new unit according to the geometry specification, as written in the Programmers Guide.

Q: But I have that all-important supeh-hyper-ultra-boloid that absolutely must be intersected with cones, planes and cylinders from standard geometry2D...
A: OK, then You can have this nice step-by-step list of things that must be changed in geometry2D:

1. Define a new border type in params.inc
2. Make sure You put all relevant local parameters in geometry2D.inc and initialize them to meaningful values in init_geometry
3. Add a new section in read_geometry to be able to read and check the input from the model definition file
4. Add a new section in set_cell_loc to establish center of cell locations
5. Add a new section in get_cell_vol (and possibly a helper subroutine) to calculate the volume inclosed between Your surfaces and any other that You may require (like planes)
6. If You are going to have solid cells, You also need to edit get_cell_sur to provide cell surface area
7. If Your surfaces require a specific ray-casting scheme, add it to get_ray_props
8. Add a new section in get_ray_start, first to locate arbitrary point in relation to the new surface set, then to detect and deal with any possible tricky situation, like having a ray that merely touches or is parallel to Your surfaces.
9. Finally, add a new ray-surface intersection finder to the trace subroutine.

Here, all done! See, nothing too difficult? Now go and do it!