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;
}
}
}
/* Project screenspace coordinates to 3D-space
* NOTE: We include this as a utility function, since the standard method
* involves quite a few steps, which are invariably always the same
* for all GPencil operations. So, it's nicer to just centralise these.
* WARNING: Assumes that it is getting called in a 3D view only
*/
bool gp_point_xy_to_3d(GP_SpaceConversion *gsc, Scene *scene, const float screen_co[2], float r_out[3])
{
View3D *v3d = gsc->sa->spacedata.first;
RegionView3D *rv3d = gsc->ar->regiondata;
float *rvec = ED_view3d_cursor3d_get(scene, v3d);
float ref[3] = {rvec[0], rvec[1], rvec[2]};
float zfac = ED_view3d_calc_zfac(rv3d, rvec, NULL);
float mval_f[2], mval_prj[2];
float dvec[3];
copy_v2_v2(mval_f, screen_co);
if (ED_view3d_project_float_global(gsc->ar, ref, mval_prj, V3D_PROJ_TEST_NOP) == V3D_PROJ_RET_OK) {
sub_v2_v2v2(mval_f, mval_prj, mval_f);
ED_view3d_win_to_delta(gsc->ar, mval_f, dvec, zfac);
sub_v3_v3v3(r_out, rvec, dvec);
return true;
}
else {
zero_v3(r_out);
return false;
}
}
static bool mesh_bisect_interactive_calc(
bContext *C, wmOperator *op,
BMEditMesh *em,
float plane_co[3], float plane_no[3])
{
wmGesture *gesture = op->customdata;
BisectData *opdata;
ARegion *ar = CTX_wm_region(C);
RegionView3D *rv3d = ar->regiondata;
int x_start = RNA_int_get(op->ptr, "xstart");
int y_start = RNA_int_get(op->ptr, "ystart");
int x_end = RNA_int_get(op->ptr, "xend");
int y_end = RNA_int_get(op->ptr, "yend");
/* reference location (some point in front of the view) for finding a point on a plane */
const float *co_ref = rv3d->ofs;
float co_a_ss[2] = {x_start, y_start}, co_b_ss[2] = {x_end, y_end}, co_delta_ss[2];
float co_a[3], co_b[3];
const float zfac = ED_view3d_calc_zfac(rv3d, co_ref, NULL);
opdata = gesture->userdata;
/* view vector */
ED_view3d_win_to_vector(ar, co_a_ss, co_a);
/* view delta */
sub_v2_v2v2(co_delta_ss, co_a_ss, co_b_ss);
ED_view3d_win_to_delta(ar, co_delta_ss, co_b, zfac);
/* cross both to get a normal */
cross_v3_v3v3(plane_no, co_a, co_b);
normalize_v3(plane_no); /* not needed but nicer for user */
/* point on plane, can use either start or endpoint */
ED_view3d_win_to_3d(ar, co_ref, co_a_ss, plane_co);
if (opdata->is_first == false)
EDBM_redo_state_restore(opdata->mesh_backup, em, false);
opdata->is_first = false;
return true;
}
float paint_calc_object_space_radius(ViewContext *vc, const float center[3],
float pixel_radius)
{
Object *ob = vc->obact;
float delta[3], scale, loc[3];
const float mval_f[2] = {pixel_radius, 0.0f};
float zfac;
mul_v3_m4v3(loc, ob->obmat, center);
zfac = ED_view3d_calc_zfac(vc->rv3d, loc, NULL);
ED_view3d_win_to_delta(vc->ar, mval_f, delta, zfac);
scale = fabsf(mat4_to_scale(ob->obmat));
scale = (scale == 0.0f) ? 1.0f : scale;
return len_v3(delta) / scale;
}
float paint_calc_object_space_radius(ViewContext *vc, float center[3],
float pixel_radius)
{
Object *ob = vc->obact;
float delta[3], scale, loc[3];
float mval_f[2];
mul_v3_m4v3(loc, ob->obmat, center);
initgrabz(vc->rv3d, loc[0], loc[1], loc[2]);
mval_f[0]= pixel_radius;
mval_f[1]= 0.0f;
ED_view3d_win_to_delta(vc->ar, mval_f, delta);
scale= fabsf(mat4_to_scale(ob->obmat));
scale= (scale == 0.0f)? 1.0f: scale;
return len_v3(delta)/scale;
}
