bool view3d_get_view_aligned_coordinate(ARegion *ar, float fp[3], const int mval[2], const bool do_fallback)
{
RegionView3D *rv3d = ar->regiondata;
float dvec[3];
int mval_cpy[2];
eV3DProjStatus ret;
ret = ED_view3d_project_int_global(ar, fp, mval_cpy, V3D_PROJ_TEST_NOP);
if (ret == V3D_PROJ_RET_OK) {
const float mval_f[2] = {(float)(mval_cpy[0] - mval[0]),
(float)(mval_cpy[1] - mval[1])};
const float zfac = ED_view3d_calc_zfac(rv3d, fp, NULL);
ED_view3d_win_to_delta(ar, mval_f, dvec, zfac);
sub_v3_v3(fp, dvec);
return true;
}
else {
/* fallback to the view center */
if (do_fallback) {
negate_v3_v3(fp, rv3d->ofs);
return view3d_get_view_aligned_coordinate(ar, fp, mval, false);
}
else {
return false;
}
}
}
static int dupli_extrude_cursor(bContext *C, wmOperator *op, wmEvent *event)
{
ViewContext vc;
EditVert *eve;
float min[3], max[3];
int done= 0;
short use_proj;
em_setup_viewcontext(C, &vc);
use_proj= (vc.scene->toolsettings->snap_flag & SCE_SNAP) && (vc.scene->toolsettings->snap_mode==SCE_SNAP_MODE_FACE);
invert_m4_m4(vc.obedit->imat, vc.obedit->obmat);
INIT_MINMAX(min, max);
for(eve= vc.em->verts.first; eve; eve= eve->next) {
if(eve->f & SELECT) {
DO_MINMAX(eve->co, min, max);
done= 1;
}
}
/* call extrude? */
if(done) {
const short rot_src= RNA_boolean_get(op->ptr, "rotate_source");
EditEdge *eed;
float vec[3], cent[3], mat[3][3];
float nor[3]= {0.0, 0.0, 0.0};
/* 2D normal calc */
float mval_f[2];
mval_f[0]= (float)event->mval[0];
mval_f[1]= (float)event->mval[1];
done= 0;
/* calculate the normal for selected edges */
for(eed= vc.em->edges.first; eed; eed= eed->next) {
if(eed->f & SELECT) {
float co1[3], co2[3];
mul_v3_m4v3(co1, vc.obedit->obmat, eed->v1->co);
mul_v3_m4v3(co2, vc.obedit->obmat, eed->v2->co);
project_float_noclip(vc.ar, co1, co1);
project_float_noclip(vc.ar, co2, co2);
/* 2D rotate by 90d while adding.
* (x, y) = (y, -x)
*
* accumulate the screenspace normal in 2D,
* with screenspace edge length weighting the result. */
if(line_point_side_v2(co1, co2, mval_f) >= 0.0f) {
nor[0] += (co1[1] - co2[1]);
nor[1] += -(co1[0] - co2[0]);
}
else {
nor[0] += (co2[1] - co1[1]);
nor[1] += -(co2[0] - co1[0]);
}
done= 1;
}
}
if(done) {
float view_vec[3], cross[3];
/* convert the 2D nomal into 3D */
mul_mat3_m4_v3(vc.rv3d->viewinv, nor); /* worldspace */
mul_mat3_m4_v3(vc.obedit->imat, nor); /* local space */
/* correct the normal to be aligned on the view plane */
copy_v3_v3(view_vec, vc.rv3d->viewinv[2]);
mul_mat3_m4_v3(vc.obedit->imat, view_vec);
cross_v3_v3v3(cross, nor, view_vec);
cross_v3_v3v3(nor, view_vec, cross);
normalize_v3(nor);
}
/* center */
mid_v3_v3v3(cent, min, max);
copy_v3_v3(min, cent);
mul_m4_v3(vc.obedit->obmat, min); // view space
view3d_get_view_aligned_coordinate(&vc, min, event->mval, TRUE);
mul_m4_v3(vc.obedit->imat, min); // back in object space
sub_v3_v3(min, cent);
/* calculate rotation */
unit_m3(mat);
if(done) {
float dot;
copy_v3_v3(vec, min);
normalize_v3(vec);
dot= dot_v3v3(vec, nor);
if( fabs(dot)<0.999) {
float cross[3], si, q1[4];
cross_v3_v3v3(cross, nor, vec);
normalize_v3(cross);
dot= 0.5f*saacos(dot);
/* halve the rotation if its applied twice */
if(rot_src) dot *= 0.5f;
si= (float)sin(dot);
q1[0]= (float)cos(dot);
q1[1]= cross[0]*si;
q1[2]= cross[1]*si;
q1[3]= cross[2]*si;
quat_to_mat3( mat,q1);
}
}
if(rot_src) {
rotateflag(vc.em, SELECT, cent, mat);
/* also project the source, for retopo workflow */
if(use_proj)
EM_project_snap_verts(C, vc.ar, vc.obedit, vc.em);
}
extrudeflag(vc.obedit, vc.em, SELECT, nor, 0);
rotateflag(vc.em, SELECT, cent, mat);
translateflag(vc.em, SELECT, min);
recalc_editnormals(vc.em);
}
else if(vc.em->selectmode & SCE_SELECT_VERTEX) {
float imat[4][4];
const float *curs= give_cursor(vc.scene, vc.v3d);
copy_v3_v3(min, curs);
view3d_get_view_aligned_coordinate(&vc, min, event->mval, TRUE);
eve= addvertlist(vc.em, 0, NULL);
invert_m4_m4(imat, vc.obedit->obmat);
mul_v3_m4v3(eve->co, imat, min);
eve->f= SELECT;
}
if(use_proj)
EM_project_snap_verts(C, vc.ar, vc.obedit, vc.em);
WM_event_add_notifier(C, NC_GEOM|ND_DATA, vc.obedit->data);
DAG_id_tag_update(vc.obedit->data, 0);
return OPERATOR_FINISHED;
}
