Use model-offset in IfcGeom::Kernel and add model-rotation

Applying model-offset in IfcGeom::Kernel makes it work
independently of the serializer.

`model-rotation` was also added to support rotation in the same
manner as `model-offset` supports offset.

src/ifcconvert/GeometrySerializer.h

@@ -56,11 +56,11 @@ public:
     SerializerSettings()
         : precision(DEFAULT_PRECISION)
     {
-        memset(offset, 0, sizeof(offset));
+        memset(serializer_offset, 0, sizeof(serializer_offset));
     }
 
     /// Optional offset that is applied to serialized objects, (0,0,0) by default.
-    double offset[3];
+    double serializer_offset[3];
 
     /// Sets the precision used to format floating-point values, 15 by default.
     /// Use a negative value to use the system's default precision (should be 6 typically).

src/ifcconvert/IfcConvert.cpp

@@ -295,7 +295,7 @@ int main(int argc, char** argv) {
             "if an object does not have any specified material in the IFC file.");
 
 
-    std::string bounds, offset_str;
+    std::string bounds, offset_str, rotation_str;
 #ifdef HAVE_ICU
     std::string unicode_mode;
 #endif
@@ -332,7 +332,9 @@ int main(int argc, char** argv) {
             "Centers the elements upon serialization by applying the center point of "
             "all placements as an offset. Applicable for OBJ and DAE output. Can take several minutes on large models.")
         ("model-offset", po::value<std::string>(&offset_str),
-            "Applies an arbitrary offset of form 'x;y;z' to all placements. Applicable for OBJ and DAE output.")
+            "Applies an arbitrary offset of form 'x;y;z' to all placements.")
+        ("model-rotation", po::value<std::string>(&rotation_str),
+             "Applies an arbitrary quaternion rotation of form 'x;y;z;w' to all placements.")
 		("site-local-placement",
 			"Place elements locally in the IfcSite coordinate system, instead of placing "
 			"them in the IFC global coords. Applicable for OBJ and DAE output.")
@@ -398,6 +400,7 @@ int main(int argc, char** argv) {
 	const bool no_normals = vmap.count("no-normals") != 0;
 	const bool center_model = vmap.count("center-model") != 0;
 	const bool model_offset = vmap.count("model-offset") != 0;
+	const bool model_rotation = vmap.count("model-rotation") != 0;
 	const bool site_local_placement = vmap.count("site-local-placement") != 0;
 	const bool building_local_placement = vmap.count("building-local-placement") != 0;
 	const bool generate_uvs = vmap.count("generate-uvs") != 0;
@@ -618,6 +621,39 @@ int main(int argc, char** argv) {
     settings.set_deflection_tolerance(deflection_tolerance);
     settings.precision = precision;
 
+    if (model_offset && center_model) {
+        Logger::Error("Cannot use --center-model together with --model-offset");
+        return EXIT_FAILURE;
+    }
+
+    if (model_offset) {
+        std::array<double,3> &offset = settings.offset;
+        if (sscanf(offset_str.c_str(), "%lf;%lf;%lf", &offset[0], &offset[1], &offset[2]) != 3) {
+            cerr_ << "[Error] Invalid use of --model-offset\n" << offset_str;
+            IfcUtil::path::delete_file(IfcUtil::path::to_utf8(output_temp_filename));
+            print_options(serializer_options);
+            return EXIT_FAILURE;
+        }
+
+        std::stringstream msg;
+        msg << "Using model offset (" << offset[0] << "," << offset[1] << "," << offset[2] << ")";
+        Logger::Notice(msg.str());
+    }
+
+    if (model_rotation) {
+        std::array<double,4> &rotation = settings.rotation;
+        if (sscanf(rotation_str.c_str(), "%lf;%lf;%lf;%lf", &rotation[0], &rotation[1], &rotation[2], &rotation[3]) != 4) {
+            cerr_ << "[Error] Invalid use of --model-rotation\n" << rotation_str;
+            IfcUtil::path::delete_file(IfcUtil::path::to_utf8(output_temp_filename));
+            print_options(serializer_options);
+            return EXIT_FAILURE;
+        }
+
+        std::stringstream msg;
+        msg << "Using model rotation (" << rotation[0] << "," << rotation[1] << "," << rotation[2] << "," << rotation[3] << ")";
+        Logger::Notice(msg.str());
+    }
+
 	boost::shared_ptr<GeometrySerializer> serializer; /**< @todo use std::unique_ptr when possible */
 	if (output_extension == OBJ) {
         // Do not use temp file for MTL as it's such a small file.
@@ -716,31 +752,23 @@ int main(int argc, char** argv) {
 
 	int old_progress = quiet ? 0 : -1;
 
-    if (is_tesselated && (center_model || model_offset)) {
-        double* offset = serializer->settings().offset;
-        if (center_model) {
-			if (site_local_placement || building_local_placement) {
-				Logger::Error("Cannot use --center-model together with --{site,building}-local-placement");
-				return EXIT_FAILURE;
-			}
+    if (is_tesselated && center_model) {
+        double* offset = serializer->settings().serializer_offset;
 
-            if (!quiet) Logger::Status("Computing bounds...");
-            context_iterator.compute_bounds();
-            if (!quiet) Logger::Status("Done!");
-
-            gp_XYZ center = (context_iterator.bounds_min() + context_iterator.bounds_max()) * 0.5;
-            offset[0] = -center.X();
-            offset[1] = -center.Y();
-            offset[2] = -center.Z();
-        } else {
-            if (sscanf(offset_str.c_str(), "%lf;%lf;%lf", &offset[0], &offset[1], &offset[2]) != 3) {
-                cerr_ << "[Error] Invalid use of --model-offset\n";
-				IfcUtil::path::delete_file(IfcUtil::path::to_utf8(output_temp_filename));
-                print_options(serializer_options);
-                return EXIT_FAILURE;
-            }
+        if (site_local_placement || building_local_placement) {
+            Logger::Error("Cannot use --center-model together with --{site,building}-local-placement");
+            return EXIT_FAILURE;
         }
 
+        if (!quiet) Logger::Status("Computing bounds...");
+        context_iterator.compute_bounds();
+        if (!quiet) Logger::Status("Done!");
+
+        gp_XYZ center = (context_iterator.bounds_min() + context_iterator.bounds_max()) * 0.5;
+        offset[0] = -center.X();
+        offset[1] = -center.Y();
+        offset[2] = -center.Z();
+
         std::stringstream msg;
         msg << "Using model offset (" << offset[0] << "," << offset[1] << "," << offset[2] << ")";
         Logger::Notice(msg.str());

src/ifcconvert/WavefrontObjSerializer.cpp

@@ -93,9 +93,9 @@ void WaveFrontOBJSerializer::write(const IfcGeom::TriangulationElement<real_t>*
 
 	const int vcount = (int)mesh.verts().size() / 3;
     for ( std::vector<real_t>::const_iterator it = mesh.verts().begin(); it != mesh.verts().end(); ) {
-        const real_t x = *(it++) + (real_t)settings().offset[0];
-        const real_t y = *(it++) + (real_t)settings().offset[1];
-        const real_t z = *(it++) + (real_t)settings().offset[2];
+        const real_t x = *(it++) + (real_t)settings().serializer_offset[0];
+        const real_t y = *(it++) + (real_t)settings().serializer_offset[1];
+        const real_t z = *(it++) + (real_t)settings().serializer_offset[2];
 		obj_stream << "v " << x << " " << y << " " << z << "\n";
 	}
 

src/ifcgeom/IfcGeom.h

@@ -21,6 +21,7 @@
 #define IFCGEOM_H
 
 #include <cmath>
+#include <array>
 
 static const double ALMOST_ZERO = 1.e-9;
 
@@ -37,6 +38,7 @@ inline static bool ALMOST_THE_SAME(const T& a, const T& b, double tolerance=ALMO
 #include <gp_GTrsf2d.hxx>
 #include <gp_Trsf.hxx>
 #include <gp_Trsf2d.hxx>
+#include <gp_Quaternion.hxx>
 #include <TopoDS.hxx>
 #include <TopoDS_Wire.hxx>
 #include <TopoDS_Face.hxx>
@@ -108,6 +110,9 @@ private:
 	double ifc_planeangle_unit;
 	double modelling_precision;
 	double dimensionality;
+	gp_Vec offset = gp_Vec{0.0, 0.0, 0.0};
+	gp_Quaternion rotation = gp_Quaternion{};
+	gp_Trsf offset_and_rotation = gp_Trsf();
 
 #ifndef NO_CACHE
 	Cache cache;
@@ -184,6 +189,9 @@ public:
 		GV_DIMENSIONALITY
 	};
 
+	void set_offset(const std::array<double, 3>& offset);
+	void set_rotation(const std::array<double, 4>& rotation);
+
 	bool convert_wire_to_face(const TopoDS_Wire& wire, TopoDS_Face& face);
 	bool convert_curve_to_wire(const Handle(Geom_Curve)& curve, TopoDS_Wire& wire);
 	bool convert_shapes(const IfcUtil::IfcBaseClass* L, IfcRepresentationShapeItems& result);

src/ifcgeom/IfcGeomFunctions.cpp

@@ -304,6 +304,28 @@ namespace {
 			}
 		}
 	}
+
+    gp_Trsf combine_offset_and_rotation(const gp_Vec &offset, const gp_Quaternion& rotation) {
+        auto offset_transform = gp_Trsf{};
+        offset_transform.SetTranslation(offset);
+
+        auto rotation_transform = gp_Trsf{};
+        rotation_transform.SetRotation(rotation);
+
+        return rotation_transform * offset_transform;
+	}
+}
+
+void IfcGeom::Kernel::set_offset(const std::array<double, 3> &p_offset) {
+    offset = gp_Vec(p_offset[0], p_offset[1], p_offset[2]);
+
+    offset_and_rotation = combine_offset_and_rotation(offset, rotation);
+}
+
+void IfcGeom::Kernel::set_rotation(const std::array<double, 4> &p_rotation) {
+    rotation = gp_Quaternion(p_rotation[0],p_rotation[1],p_rotation[2],p_rotation[3]);
+
+    offset_and_rotation = combine_offset_and_rotation(offset, rotation);
 }
 
 bool IfcGeom::Kernel::create_solid_from_compound(const TopoDS_Shape& compound, TopoDS_Shape& shape) {

src/ifcgeom/IfcGeomHelpers.cpp

@@ -413,6 +413,9 @@ bool IfcGeom::Kernel::convert(const IfcSchema::IfcObjectPlacement* l, gp_Trsf& t
 			else break;
 		} else break;
 	}
+
+	trsf.PreMultiply(offset_and_rotation);
+
 	CACHE(IfcObjectPlacement,l,trsf)
 	return true;
 }

src/ifcgeom/IfcGeomIterator.h

@@ -720,6 +720,8 @@ namespace IfcGeom {
 			} else if (settings.get(IteratorSettings::SITE_LOCAL_PLACEMENT)) {
 				kernel.set_conversion_placement_rel_to(IfcSchema::Type::IfcSite);
 			}
+			kernel.set_offset(settings.offset);
+			kernel.set_rotation(settings.rotation);
 		}
 
 		bool owns_ifc_file;

src/ifcgeom/IfcGeomIteratorSettings.h

@@ -20,6 +20,8 @@
 #ifndef IFCGEOMITERATORSETTINGS_H
 #define IFCGEOMITERATORSETTINGS_H
 
+#include <array>
+
 #include "ifc_geom_api.h"
 #include "../ifcparse/IfcException.h"
 #include "../ifcparse/IfcBaseClass.h"
@@ -128,6 +130,11 @@ namespace IfcGeom
             }
         }
 
+        /// Optional offset x,y,z that is applied to all elements, (0,0,0) by default.
+        std::array<double,3> offset = {0.0, 0.0, 0.0};
+        /// Optional rotation x,y,z,w that is applied to all elements, (0,0,0,1) by default.
+        std::array<double,4> rotation = {0.0, 0.0, 0.0, 1.0};
+
     protected:
         SettingField settings_;
         double deflection_tolerance_;