diff options
Diffstat (limited to 'source/blender/io/wavefront_obj/exporter/obj_export_nurbs.cc')
| -rw-r--r-- | source/blender/io/wavefront_obj/exporter/obj_export_nurbs.cc | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/source/blender/io/wavefront_obj/exporter/obj_export_nurbs.cc b/source/blender/io/wavefront_obj/exporter/obj_export_nurbs.cc new file mode 100644 index 00000000000..4138ad2f697 --- /dev/null +++ b/source/blender/io/wavefront_obj/exporter/obj_export_nurbs.cc @@ -0,0 +1,122 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/** \file + * \ingroup obj + */ + +#include "BLI_float3.hh" +#include "BLI_listbase.h" +#include "BLI_math.h" + +#include "DEG_depsgraph.h" +#include "DEG_depsgraph_query.h" + +#include "IO_wavefront_obj.h" +#include "obj_export_nurbs.hh" + +namespace blender::io::obj { +OBJCurve::OBJCurve(const Depsgraph *depsgraph, + const OBJExportParams &export_params, + Object *curve_object) + : export_object_eval_(curve_object) +{ + export_object_eval_ = DEG_get_evaluated_object(depsgraph, curve_object); + export_curve_ = static_cast<Curve *>(export_object_eval_->data); + set_world_axes_transform(export_params.forward_axis, export_params.up_axis); +} + +/** + * Set the final transform after applying axes settings and an Object's world transform. + */ +void OBJCurve::set_world_axes_transform(const eTransformAxisForward forward, + const eTransformAxisUp up) +{ + float axes_transform[3][3]; + unit_m3(axes_transform); + /* +Y-forward and +Z-up are the Blender's default axis settings. */ + mat3_from_axis_conversion(OBJ_AXIS_Y_FORWARD, OBJ_AXIS_Z_UP, forward, up, axes_transform); + /* mat3_from_axis_conversion returns a transposed matrix! */ + transpose_m3(axes_transform); + mul_m4_m3m4(world_axes_transform_, axes_transform, export_object_eval_->obmat); + /* #mul_m4_m3m4 does not transform last row of #Object.obmat, i.e. location data. */ + mul_v3_m3v3(world_axes_transform_[3], axes_transform, export_object_eval_->obmat[3]); + world_axes_transform_[3][3] = export_object_eval_->obmat[3][3]; +} + +const char *OBJCurve::get_curve_name() const +{ + return export_object_eval_->id.name + 2; +} + +int OBJCurve::total_splines() const +{ + return BLI_listbase_count(&export_curve_->nurb); +} + +/** + * \param spline_index: Zero-based index of spline of interest. + * \return: Total vertices in a spline. + */ +int OBJCurve::total_spline_vertices(const int spline_index) const +{ + const Nurb *const nurb = static_cast<Nurb *>(BLI_findlink(&export_curve_->nurb, spline_index)); + return nurb->pntsu * nurb->pntsv; +} + +/** + * Get coordinates of the vertex at the given index on the given spline. + */ +float3 OBJCurve::vertex_coordinates(const int spline_index, + const int vertex_index, + const float scaling_factor) const +{ + const Nurb *const nurb = static_cast<Nurb *>(BLI_findlink(&export_curve_->nurb, spline_index)); + float3 r_coord; + const BPoint &bpoint = nurb->bp[vertex_index]; + copy_v3_v3(r_coord, bpoint.vec); + mul_m4_v3(world_axes_transform_, r_coord); + mul_v3_fl(r_coord, scaling_factor); + return r_coord; +} + +/** + * Get total control points of the NURBS spline at the given index. This is different than total + * vertices of a spline. + */ +int OBJCurve::total_spline_control_points(const int spline_index) const +{ + const Nurb *const nurb = static_cast<Nurb *>(BLI_findlink(&export_curve_->nurb, spline_index)); + const int r_nurbs_degree = nurb->orderu - 1; + /* Total control points = Number of points in the curve (+ degree of the + * curve if it is cyclic). */ + int r_tot_control_points = nurb->pntsv * nurb->pntsu; + if (nurb->flagu & CU_NURB_CYCLIC) { + r_tot_control_points += r_nurbs_degree; + } + return r_tot_control_points; +} + +/** + * Get the degree of the NURBS spline at the given index. + */ +int OBJCurve::get_nurbs_degree(const int spline_index) const +{ + const Nurb *const nurb = static_cast<Nurb *>(BLI_findlink(&export_curve_->nurb, spline_index)); + return nurb->orderu - 1; +} + +} // namespace blender::io::obj |