IfcOpenShell/src/ifcgeom/mapping/IfcExtrudedAreaSolid.cpp

/********************************************************************************
 *                                                                              *
 * This file is part of IfcOpenShell.                                           *
 *                                                                              *
 * IfcOpenShell is free software: you can redistribute it and/or modify         *
 * it under the terms of the Lesser GNU General Public License as published by  *
 * the Free Software Foundation, either version 3.0 of the License, or          *
 * (at your option) any later version.                                          *
 *                                                                              *
 * IfcOpenShell 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                 *
 * Lesser GNU General Public License for more details.                          *
 *                                                                              *
 * You should have received a copy of the Lesser GNU General Public License     *
 * along with this program. If not, see <http://www.gnu.org/licenses/>.         *
 *                                                                              *
 ********************************************************************************/

// uncomment if you'd like negative or close to zero extrusion depths to succeed
// #define PERMISSIVE_EXTRUSION

#include "mapping.h"
#define mapping POSTFIX_SCHEMA(mapping)
using namespace ifcopenshell::geometry;

taxonomy::ptr mapping::map_impl(const IfcSchema::IfcExtrudedAreaSolid* inst) {
	const double height = inst->Depth() * length_unit_;
	if (height < settings_.get<settings::Precision>().get()) {
		Logger::Message(Logger::LOG_ERROR, "GEO", 259, "Non-positive extrusion height encountered for:", inst);
#ifndef PERMISSIVE_EXTRUSION
		return nullptr;
#endif
	}

	taxonomy::matrix4::ptr matrix;
	bool has_position = true;
#ifdef SCHEMA_IfcSweptAreaSolid_Position_IS_OPTIONAL
	has_position = inst->Position() != nullptr;
#endif
	if (has_position) {
		matrix = taxonomy::cast<taxonomy::matrix4>(map(inst->Position()));
	}

#ifdef PERMISSIVE_EXTRUSION
	if (abs(height) < getValue(GV_PRECISION)) {
		face->matrix = matrix;
		return face;
	}
#endif

	auto basis = map(inst->SweptArea());
	if (auto bases = taxonomy::dcast<taxonomy::collection>(basis)) {
		// @todo this requires a unified approach for all sweeps
		auto c = taxonomy::make<taxonomy::collection>();
		for (auto& f : bases->children) {
			c->children.push_back(
				taxonomy::make<taxonomy::extrusion>(
					matrix,
					taxonomy::cast<taxonomy::face>(f),
					taxonomy::cast<taxonomy::direction3>(map(inst->ExtrudedDirection())),
					height
				)
			);
			c->children.back()->instance = inst;
		}
		return c;
	} else {
		return taxonomy::make<taxonomy::extrusion>(
			matrix,
			taxonomy::cast<taxonomy::face>(basis),
			taxonomy::cast<taxonomy::direction3>(map(inst->ExtrudedDirection())),
			height
		);
	}
}