diff options
Diffstat (limited to 'source/blender/io/usd/intern/usd_reader_nurbs.cc')
| -rw-r--r-- | source/blender/io/usd/intern/usd_reader_nurbs.cc | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/source/blender/io/usd/intern/usd_reader_nurbs.cc b/source/blender/io/usd/intern/usd_reader_nurbs.cc new file mode 100644 index 00000000000..9b30b524729 --- /dev/null +++ b/source/blender/io/usd/intern/usd_reader_nurbs.cc @@ -0,0 +1,256 @@ +/* + * 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. + * + * Adapted from the Blender Alembic importer implementation. + * + * Modifications Copyright (C) 2021 Tangent Animation. + * All rights reserved. + */ + +#include "usd_reader_nurbs.h" + +#include "BKE_curve.h" +#include "BKE_mesh.h" +#include "BKE_object.h" + +#include "BLI_listbase.h" + +#include "DNA_curve_types.h" +#include "DNA_object_types.h" + +#include "MEM_guardedalloc.h" + +#include <pxr/base/vt/array.h> +#include <pxr/base/vt/types.h> +#include <pxr/base/vt/value.h> +#include <pxr/usd/sdf/types.h> + +#include <pxr/usd/usdGeom/curves.h> + +static bool set_knots(const pxr::VtDoubleArray &knots, float *&nu_knots) +{ + if (knots.empty()) { + return false; + } + + /* Skip first and last knots, as they are used for padding. */ + const size_t num_knots = knots.size(); + nu_knots = static_cast<float *>(MEM_callocN(num_knots * sizeof(float), __func__)); + + for (size_t i = 0; i < num_knots; i++) { + nu_knots[i] = (float)knots[i]; + } + + return true; +} + +namespace blender::io::usd { + +void USDNurbsReader::create_object(Main *bmain, const double /* motionSampleTime */) +{ + curve_ = BKE_curve_add(bmain, name_.c_str(), OB_CURVE); + + curve_->flag |= CU_DEFORM_FILL | CU_3D; + curve_->actvert = CU_ACT_NONE; + curve_->resolu = 2; + + object_ = BKE_object_add_only_object(bmain, OB_CURVE, name_.c_str()); + object_->data = curve_; +} + +void USDNurbsReader::read_object_data(Main *bmain, const double motionSampleTime) +{ + Curve *cu = (Curve *)object_->data; + read_curve_sample(cu, motionSampleTime); + + if (curve_prim_.GetPointsAttr().ValueMightBeTimeVarying()) { + add_cache_modifier(); + } + + USDXformReader::read_object_data(bmain, motionSampleTime); +} + +void USDNurbsReader::read_curve_sample(Curve *cu, const double motionSampleTime) +{ + curve_prim_ = pxr::UsdGeomNurbsCurves(prim_); + + pxr::UsdAttribute widthsAttr = curve_prim_.GetWidthsAttr(); + pxr::UsdAttribute vertexAttr = curve_prim_.GetCurveVertexCountsAttr(); + pxr::UsdAttribute pointsAttr = curve_prim_.GetPointsAttr(); + + pxr::VtIntArray usdCounts; + vertexAttr.Get(&usdCounts, motionSampleTime); + + pxr::VtVec3fArray usdPoints; + pointsAttr.Get(&usdPoints, motionSampleTime); + + pxr::VtFloatArray usdWidths; + widthsAttr.Get(&usdWidths, motionSampleTime); + + pxr::VtIntArray orders; + curve_prim_.GetOrderAttr().Get(&orders, motionSampleTime); + + pxr::VtDoubleArray knots; + curve_prim_.GetKnotsAttr().Get(&knots, motionSampleTime); + + pxr::VtVec3fArray usdNormals; + curve_prim_.GetNormalsAttr().Get(&usdNormals, motionSampleTime); + + /* If normals, extrude, else bevel. + * Perhaps to be replaced by Blender USD Schema. */ + if (!usdNormals.empty()) { + /* Set extrusion to 1. */ + curve_->ext1 = 1.0f; + } + else { + /* Set bevel depth to 1. */ + curve_->ext2 = 1.0f; + } + + size_t idx = 0; + for (size_t i = 0; i < usdCounts.size(); i++) { + const int num_verts = usdCounts[i]; + + Nurb *nu = static_cast<Nurb *>(MEM_callocN(sizeof(Nurb), __func__)); + nu->flag = CU_SMOOTH; + nu->type = CU_NURBS; + + nu->resolu = cu->resolu; + nu->resolv = cu->resolv; + + nu->pntsu = num_verts; + nu->pntsv = 1; + + if (i < orders.size()) { + nu->orderu = static_cast<short>(orders[i]); + } + else { + nu->orderu = 4; + nu->orderv = 4; + } + + /* TODO(makowalski): investigate setting Cyclic U and Endpoint U options. */ +#if 0 + if (knots.size() > 3) { + if ((knots[0] == knots[1]) && (knots[knots.size()] == knots[knots.size() - 1])) { + nu->flagu |= CU_NURB_ENDPOINT; + } else { + nu->flagu |= CU_NURB_CYCLIC; + } + } +#endif + + float weight = 1.0f; + + nu->bp = static_cast<BPoint *>(MEM_callocN(sizeof(BPoint) * nu->pntsu, __func__)); + BPoint *bp = nu->bp; + + for (int j = 0; j < nu->pntsu; j++, bp++, idx++) { + bp->vec[0] = (float)usdPoints[idx][0]; + bp->vec[1] = (float)usdPoints[idx][1]; + bp->vec[2] = (float)usdPoints[idx][2]; + bp->vec[3] = weight; + bp->f1 = SELECT; + bp->weight = weight; + + float radius = 0.1f; + if (idx < usdWidths.size()) { + radius = usdWidths[idx]; + } + + bp->radius = radius; + } + + if (!set_knots(knots, nu->knotsu)) { + BKE_nurb_knot_calc_u(nu); + } + + BLI_addtail(BKE_curve_nurbs_get(cu), nu); + } +} + +Mesh *USDNurbsReader::read_mesh(struct Mesh * /* existing_mesh */, + const double motionSampleTime, + const int /* read_flag */, + const char ** /* err_str */) +{ + pxr::UsdGeomCurves curve_prim_(prim_); + + pxr::UsdAttribute widthsAttr = curve_prim_.GetWidthsAttr(); + pxr::UsdAttribute vertexAttr = curve_prim_.GetCurveVertexCountsAttr(); + pxr::UsdAttribute pointsAttr = curve_prim_.GetPointsAttr(); + + pxr::VtIntArray usdCounts; + + vertexAttr.Get(&usdCounts, motionSampleTime); + int num_subcurves = usdCounts.size(); + + pxr::VtVec3fArray usdPoints; + pointsAttr.Get(&usdPoints, motionSampleTime); + + int vertex_idx = 0; + int curve_idx; + Curve *curve = static_cast<Curve *>(object_->data); + + const int curve_count = BLI_listbase_count(&curve->nurb); + bool same_topology = curve_count == num_subcurves; + + if (same_topology) { + Nurb *nurbs = static_cast<Nurb *>(curve->nurb.first); + for (curve_idx = 0; nurbs; nurbs = nurbs->next, curve_idx++) { + const int num_in_usd = usdCounts[curve_idx]; + const int num_in_blender = nurbs->pntsu; + + if (num_in_usd != num_in_blender) { + same_topology = false; + break; + } + } + } + + if (!same_topology) { + BKE_nurbList_free(&curve->nurb); + read_curve_sample(curve, motionSampleTime); + } + else { + Nurb *nurbs = static_cast<Nurb *>(curve->nurb.first); + for (curve_idx = 0; nurbs; nurbs = nurbs->next, curve_idx++) { + const int totpoint = usdCounts[curve_idx]; + + if (nurbs->bp) { + BPoint *point = nurbs->bp; + + for (int i = 0; i < totpoint; i++, point++, vertex_idx++) { + point->vec[0] = usdPoints[vertex_idx][0]; + point->vec[1] = usdPoints[vertex_idx][1]; + point->vec[2] = usdPoints[vertex_idx][2]; + } + } + else if (nurbs->bezt) { + BezTriple *bezier = nurbs->bezt; + + for (int i = 0; i < totpoint; i++, bezier++, vertex_idx++) { + bezier->vec[1][0] = usdPoints[vertex_idx][0]; + bezier->vec[1][1] = usdPoints[vertex_idx][1]; + bezier->vec[1][2] = usdPoints[vertex_idx][2]; + } + } + } + } + + return BKE_mesh_new_nomain_from_curve(object_); +} + +} // namespace blender::io::usd |