[Feature][Mesh][3D] new 3D mesh layer renderer

src/3d/CMakeLists.txt

@@ -59,6 +59,12 @@ SET(QGIS_3D_SRCS
   terrain/qgsterraintileloader_p.cpp
   #terrain/quantizedmeshgeometry.cpp
   #terrain/quantizedmeshterraingenerator.cpp
+
+  mesh/qgsmesh3dgeometry_p.cpp
+  mesh/qgsmesh3dentity_p.cpp
+  mesh/qgsmesh3dmaterial_p.cpp
+  mesh/qgsmeshterraingenerator.cpp
+
 )
 
 SET(QGIS_3D_HDRS
@@ -97,6 +103,7 @@ SET(QGIS_3D_HDRS
   terrain/qgsterraintileloader_p.h
   chunks/qgschunkloader_p.h
   chunks/qgschunkqueuejob_p.h
+  mesh/qgsmeshterraingenerator.h
 )
 
 SET(QGIS_3D_PRIVATE_HDRS
@@ -116,6 +123,9 @@ SET(QGIS_3D_PRIVATE_HDRS
   terrain/qgsterraintexturegenerator_p.h
   terrain/qgsterraintextureimage_p.h
   terrain/qgsterraintileentity_p.h
+  mesh/qgsmesh3dentity_p.h
+  mesh/qgsmesh3dgeometry_p.h
+  mesh/qgsmesh3dmaterial_p.h
 )
 
 QT5_ADD_RESOURCES(QGIS_3D_RCC_SRCS shaders.qrc)
@@ -125,6 +135,7 @@ QT5_ADD_RESOURCES(QGIS_3D_RCC_SRCS shaders.qrc)
 INCLUDE_DIRECTORIES(
   ${CMAKE_CURRENT_SOURCE_DIR}
   ${CMAKE_CURRENT_SOURCE_DIR}/chunks
+  ${CMAKE_CURRENT_SOURCE_DIR}/mesh
   ${CMAKE_CURRENT_SOURCE_DIR}/symbols
   ${CMAKE_CURRENT_SOURCE_DIR}/terrain
   ${CMAKE_SOURCE_DIR}/src/core/

src/3d/chunks/qgschunkedentity_p.cpp

@@ -56,6 +56,9 @@ static float screenSpaceError( float epsilon, float distance, float screenSize,
 
 static float screenSpaceError( QgsChunkNode *node, const QgsChunkedEntity::SceneState &state )
 {
+  if ( node->error() <= 0 ) //it happens for meshes
+    return 0;
+
   float dist = node->bbox().distanceFromPoint( state.cameraPos );
 
   // TODO: what to do when distance == 0 ?

src/3d/mesh/qgsmesh3dentity_p.cpp

@@ -0,0 +1,108 @@
+/***************************************************************************
+                         qgsmesh3dentity.cpp
+                         -------------------------
+    begin                : january 2020
+    copyright            : (C) 2020 by Vincent Cloarec
+    email                : vcloarec 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.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "qgsmesh3dentity_p.h"
+
+#include <Qt3DRender/QGeometryRenderer>
+
+#include "qgsmeshlayer.h"
+#include "qgsmapsettings.h"
+#include "qgs3dmapsettings.h"
+#include "qgsmeshlayerrenderer.h"
+#include "qgsterraintextureimage_p.h"
+#include "qgsmesh3dmaterial_p.h"
+
+
+QgsMesh3dEntity::QgsMesh3dEntity( const Qgs3DMapSettings &map,
+                                  const QgsTriangularMesh triangularMesh,
+                                  const QgsRectangle &extent,
+                                  const QgsMesh3DSymbol &symbol ):
+  mExtent( extent ),
+  mSymbol( symbol ),
+  mMapSettings( map ),
+  mTriangularMesh( triangularMesh )
+{}
+
+void QgsMesh3dEntity::build()
+{
+  buildGeometry();
+  applyMaterial();
+}
+
+void QgsMesh3dEntity::buildGeometry()
+{
+  Qt3DRender::QGeometryRenderer *mesh = new Qt3DRender::QGeometryRenderer;
+  QVector<double> fakeScalarMag( mTriangularMesh.vertices().count() );
+  for ( int i = 0; i < mTriangularMesh.vertices().count(); ++i )
+  {
+    fakeScalarMag[i] = mTriangularMesh.vertices().at( i ).z();
+  }
+
+  mesh->setGeometry( new QgsMesh3dGeometry( mTriangularMesh,
+                     mExtent,
+                     mSymbol.verticaleScale(),
+                     mesh ) );
+
+  addComponent( mesh );
+
+  Qt3DCore::QTransform *tform = new Qt3DCore::QTransform;
+  tform->setTranslation( QVector3D( float( -mMapSettings.origin().x() ), 0, float( mMapSettings.origin().y() ) ) );
+  addComponent( tform );
+}
+
+void QgsMesh3dEntity::applyMaterial()
+{
+  mMaterial = new QgsMesh3dMaterial( mSymbol );
+  addComponent( mMaterial );
+}
+
+QgsMesh3dTerrainTileEntity::QgsMesh3dTerrainTileEntity( const Qgs3DMapSettings &map,
+    const QgsTriangularMesh triangularMesh,
+    const QgsRectangle &extent,
+    const QgsMesh3DSymbol &symbol,
+    QgsChunkNodeId nodeId,
+    Qt3DCore::QNode *parent ):
+  QgsTerrainTileEntity( nodeId, parent ),
+  mExtent( extent ),
+  mSymbol( symbol ),
+  mMapSettings( map ),
+  mTriangularMesh( triangularMesh )
+{}
+
+void QgsMesh3dTerrainTileEntity::build()
+{
+  buildGeometry();
+  applyMaterial();
+}
+
+void QgsMesh3dTerrainTileEntity::buildGeometry()
+{
+  Qt3DRender::QGeometryRenderer *mesh = new Qt3DRender::QGeometryRenderer;
+
+  mesh->setGeometry( new QgsMesh3dGeometry( mTriangularMesh, mExtent, mSymbol.verticaleScale(), mesh ) );
+  addComponent( mesh );
+
+  Qt3DCore::QTransform *tform = new Qt3DCore::QTransform;
+  tform->setTranslation( QVector3D( float( -mMapSettings.origin().x() ), 0, float( mMapSettings.origin().y() ) ) );
+  addComponent( tform );
+}
+
+void QgsMesh3dTerrainTileEntity::applyMaterial()
+{
+  mMaterial = new QgsMesh3dMaterial( mSymbol );
+  addComponent( mMaterial );
+}

src/3d/mesh/qgsmesh3dentity_p.h

@@ -0,0 +1,102 @@
+/***************************************************************************
+                         qgsmesh3dentity.h
+                         -------------------------
+    begin                : january 2020
+    copyright            : (C) 2020 by Vincent Cloarec
+    email                : vcloarec 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 QGSMESHENTITY_H
+#define QGSMESHENTITY_H
+
+#include <Qt3DCore/QEntity>
+
+#include "mesh/qgsmesh3dgeometry_p.h"
+#include "qgs3dmapsettings.h"
+#include "qgsmesh3dsymbol.h"
+#include "qgsterraintileentity_p.h"
+
+///@cond PRIVATE
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the QGIS API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+
+class Qgs3DMapSettings;
+class QgsTessellatedPolygonGeometry;
+class QgsMesh3DSymbol;
+
+class QgsMeshLayer;
+class QgsMesh3dMaterial;
+
+//! Entity that handles rendering of mesh
+class QgsMesh3dEntity: public Qt3DCore::QEntity
+{
+  public:
+    //! Constructor
+    QgsMesh3dEntity( const Qgs3DMapSettings &map,
+                     const QgsTriangularMesh triangularMesh,
+                     const QgsRectangle &extent,
+                     const QgsMesh3DSymbol &symbol );
+
+    //! Builds the geometry and the material
+    void build();
+
+  private:
+    virtual void buildGeometry();
+    virtual void applyMaterial();
+
+    QgsRectangle mExtent;
+    QgsMesh3DSymbol mSymbol;
+    Qgs3DMapSettings mMapSettings;
+    QgsTriangularMesh mTriangularMesh;
+    QgsMesh3dMaterial *mMaterial = nullptr;
+
+    static int mMesh3DEntityCount;
+    QString name;
+};
+
+//! Entity that handles rendering of terrain mesh
+class QgsMesh3dTerrainTileEntity: public QgsTerrainTileEntity
+{
+  public:
+    QgsMesh3dTerrainTileEntity( const Qgs3DMapSettings &map,
+                                const QgsTriangularMesh triangularMesh,
+                                const QgsRectangle &extent,
+                                const QgsMesh3DSymbol &symbol,
+                                QgsChunkNodeId nodeId,
+                                Qt3DCore::QNode *parent = nullptr );
+
+    void build();
+
+  private:
+    virtual void buildGeometry();
+    virtual void applyMaterial();
+
+    QgsRectangle mExtent;
+    QgsMesh3DSymbol mSymbol;
+    Qgs3DMapSettings mMapSettings;
+    QgsTriangularMesh mTriangularMesh;
+    QgsMesh3dMaterial *mMaterial = nullptr;
+
+    static int mMesh3DEntityCount;
+    QString name;
+};
+
+///@endcond
+
+#endif // QGSMESHENTITY_H