| commit | author | age | ||
| 0af0cf | 1 | #include<general.h> |
| SP | 2 | #include<cross-section.h> |
| 3 | #include<coord.h> | |
| 4 | ||
| 5 | /** @brief Calculates cross-section of vesicle with plane. | |
| 6 | * | |
| 7 | * Function returns points of cross-section of vesicle with plane. Plane is described with equation $ax+by+cz+d=0$. Algorithm extracts coordinates of each vertex of a vesicle and then: | |
| 8 | * | |
| 9 | * if a distance of point to plane (given by equation $D=\frac{ax_0+by_0+cz_0+d}{\sqrt{a^2+b^2+c^2}}$, where $x_0$, $y_0$ and $z_0$ are coordinates of a given vertex) is less than maximal allowed distance between vertices {\tt sqrt(vesicle->dmax)} than vertex is a candidate for crossection calculation. | |
| 10 | * | |
| 11 | */ | |
| 12 | ts_coord_list get_crossection_with_plane(ts_vesicle vesicle,ts_double a,ts_double b,ts_double c, ts_double d){ | |
| 13 | ||
| 14 | ||
| 15 | ts_uint i, j, k; | |
| 16 | ts_double pp,Dsq; // distance from the plane squared | |
| 17 | ts_double ppn,Dsqn; // distance from the plane squared of a neighbor | |
| 18 | ts_double u; //factor to scale vector from first vector to the second to get intersection | |
| 19 | ts_vertex *vtx; | |
| 20 | ||
| 21 | ts_coord_list *pts=init_coord_list(); | |
| 22 | for(i=0;i<vesicle->vlist->N;i++){ | |
| 23 | vtx=vesicle->vlist->vtx[i]; | |
| 24 | ||
| 25 | pp=vtx->x*a+vtx->y*b+vtx->z*c+d; | |
| 26 | Dsq=pp*pp/(a*a+b*b+c*c); | |
| 27 | if(Dsq<vesicle->dmax){ | |
| 28 | for(j=0;j<vtx->neigh_no;j++){ | |
| 29 | ppn=vtx->neigh[j]->x*a+vtx->neigh[j]->y*b+vtx->neigh[j]->z*c+d; | |
| 30 | if(pp*ppn<0){ //the combination of vertices are good candidates for a crossection | |
| 31 | u=pp/(a*(vtx->x-vtx->neigh[j]->x)+b*(vtx->y-vtx->neigh[j]->y)+c(vtx->z-vtx->neigh[j]->z)); | |
| 32 | add_coord(pts, vtx->x+u(vtx->neigh[j]->x - vtx->x), | |
| 33 | vtx->y+u(vtx->neigh[j]->y - vtx->y), | |
| 34 | vtx->z+u(vtx->neigh[j]->z - vtx->z), | |
| 35 | TS_COORD_CARTESIAN); | |
| 36 | } | |
| 37 | } | |
| 38 | } | |
| 39 | } | |
| 40 | return pts; | |
| 41 | } | |
| 42 | ||
| 43 | ||
