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qgstessellatedpolygongeometry.h
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qgstessellatedpolygongeometry.h
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/***************************************************************************
qgstessellatedpolygongeometry.h
--------------------------------------
Date : July 2017
Copyright : (C) 2017 by Martin Dobias
Email : wonder dot sk at gmail dot com
***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#ifndef QGSTESSELLATEDPOLYGONGEOMETRY_H
#define QGSTESSELLATEDPOLYGONGEOMETRY_H
#include "qgspolygon.h"
#include <Qt3DRender/QGeometry>
namespace Qt3DRender
{
class QBuffer;
}
/**
* \ingroup 3d
* Class derived from Qt3DRender::QGeometry that represents polygons tessellated into 3D geometry.
*
* Takes a list of polygons as input, internally it does tessellation and writes output to the internal
* vertex buffer. Optionally it can add "walls" if the extrusion height is non-zero.
*
* \since QGIS 3.0
*/
class QgsTessellatedPolygonGeometry : public Qt3DRender::QGeometry
{
public:
//! Constructor
QgsTessellatedPolygonGeometry( QNode *parent = nullptr );
~QgsTessellatedPolygonGeometry();
//! Returns whether the normals of triangles will be inverted (useful for fixing clockwise / counter-clockwise face vertex orders)
bool invertNormals() const { return mInvertNormals; }
//! Sets whether the normals of triangles will be inverted (useful for fixing clockwise / counter-clockwise face vertex orders)
void setInvertNormals( bool invert ) { mInvertNormals = invert; }
//! Initializes vertex buffer from given polygons. Takes ownership of passed polygon geometries
void setPolygons( const QList<QgsPolygon *> &polygons, const QgsPointXY &origin, float extrusionHeight, const QList<float> &extrusionHeightPerPolygon = QList<float>() );
private:
Qt3DRender::QAttribute *mPositionAttribute = nullptr;
Qt3DRender::QAttribute *mNormalAttribute = nullptr;
Qt3DRender::QBuffer *mVertexBuffer = nullptr;
bool mWithNormals = true;
bool mInvertNormals = false;
};
#endif // QGSTESSELLATEDPOLYGONGEOMETRY_H