Add OpenGL model renderer and improve update/visibility handling for increased performance.

14 files changed, 3269 insertions, 93 deletions

diff --git a/README b/README
index 314cdb9..b8f0800 100644
--- a/README
+++ b/README
@@ -1 +1,2 @@
 All the textures used are from the Wolfenstein 3D Texture Library, http://www.areyep.com/RIPandMCS-TextureLibrary.html
+2008-11-30
diff --git a/entity.cpp b/entity.cpp
index cdcd4c7..b8f1ea9 100644
--- a/entity.cpp
+++ b/entity.cpp
@@ -135,9 +135,3 @@ void Entity::updateImage()
     else
         setImage(images.at(m_angleIndex));
 }
-
-void MazeScene::addEntity(Entity *entity)
-{
-    addItem(entity);
-    m_entities << entity;
-}
diff --git a/main.cpp b/main.cpp
index 1b1f389..14fd589 100644
--- a/main.cpp
+++ b/main.cpp
@@ -14,7 +14,7 @@ int main(int argc, char **argv)
         "#      #"
         "# #### #"
         "&    # #"
-        "# @@   &"
+        "* @@   &"
         "# @@ # #"
         "#      #"
         "###&%-##"
diff --git a/matrix4x4.cpp b/matrix4x4.cpp
index 66ecb81..ad1da29 100644
--- a/matrix4x4.cpp
+++ b/matrix4x4.cpp
@@ -2,7 +2,7 @@
 
 Matrix4x4::Matrix4x4()
 {
-    qreal identity[] =
+    float identity[] =
     {
         1, 0, 0, 0,
         0, 1, 0, 0,
@@ -13,12 +13,21 @@ Matrix4x4::Matrix4x4()
     setData(identity);
 }
 
-Matrix4x4::Matrix4x4(qreal *data)
+Matrix4x4::Matrix4x4(float *data)
 {
     setData(data);
 }
 
-void Matrix4x4::setData(qreal *data)
+Matrix4x4 Matrix4x4::orderSwapped() const
+{
+    float data[16];
+    for (int i = 0; i < 4; ++i)
+        for (int j = 0; j < 4; ++j)
+            data[4*i + j] = m[4*j + i];
+    return Matrix4x4(data);
+}
+
+void Matrix4x4::setData(float *data)
 {
     for (int i = 0; i < 16; ++i)
         m[i] = data[i];
@@ -42,14 +51,24 @@ Matrix4x4 Matrix4x4::operator*(const Matrix4x4 &other) const
     return Matrix4x4(*this) *= other;
 }
 
-Matrix4x4 Matrix4x4::fromRotation(qreal angle, Qt::Axis axis)
+Point3d Matrix4x4::operator*(const Point3d &p) const
+{
+    qreal x = m[0] * p.x + m[4] * p.y + m[8] * p.z + m[12];
+    qreal y = m[1] * p.x + m[5] * p.y + m[9] * p.z + m[13];
+    qreal z = m[2] * p.x + m[6] * p.y + m[10] * p.z + m[14];
+    qreal w = m[3] * p.x + m[7] * p.y + m[11] * p.z + m[15];
+
+    return Point3d(x / w, y / w, z / w);
+}
+
+Matrix4x4 Matrix4x4::fromRotation(float angle, Qt::Axis axis)
 {
     QTransform rot;
     rot.rotate(angle);
     switch (axis) {
     case Qt::XAxis:
         {
-        qreal data[] =
+        float data[] =
         {
             1, 0, 0, 0,
             0, rot.m11(), rot.m12(), 0,
@@ -60,7 +79,7 @@ Matrix4x4 Matrix4x4::fromRotation(qreal angle, Qt::Axis axis)
         }
     case Qt::YAxis:
         {
-        qreal data[] =
+        float data[] =
         {
             rot.m11(), 0, rot.m12(), 0,
             0, 1, 0, 0,
@@ -71,7 +90,7 @@ Matrix4x4 Matrix4x4::fromRotation(qreal angle, Qt::Axis axis)
         }
     case Qt::ZAxis:
         {
-        qreal data[] =
+        float data[] =
         {
             rot.m11(), rot.m12(), 0, 0,
             rot.m21(), rot.m22(), 0, 0,
@@ -85,9 +104,9 @@ Matrix4x4 Matrix4x4::fromRotation(qreal angle, Qt::Axis axis)
     }
 }
 
-Matrix4x4 Matrix4x4::fromTranslation(qreal dx, qreal dy, qreal dz)
+Matrix4x4 Matrix4x4::fromTranslation(float dx, float dy, float dz)
 {
-    qreal data[] =
+    float data[] =
     {
         1, 0, 0, 0,
         0, 1, 0, 0,
@@ -97,9 +116,9 @@ Matrix4x4 Matrix4x4::fromTranslation(qreal dx, qreal dy, qreal dz)
     return Matrix4x4(data);
 }
 
-Matrix4x4 Matrix4x4::fromScale(qreal sx, qreal sy, qreal sz)
+Matrix4x4 Matrix4x4::fromScale(float sx, float sy, float sz)
 {
-    qreal data[] =
+    float data[] =
     {
         sx, 0, 0, 0,
         0, sy, 0, 0,
@@ -109,26 +128,20 @@ Matrix4x4 Matrix4x4::fromScale(qreal sx, qreal sy, qreal sz)
     return Matrix4x4(data);
 }
 
-Matrix4x4 Matrix4x4::fromProjection(qreal fov)
+Matrix4x4 Matrix4x4::fromProjection(float fov)
 {
-    qreal data[] =
-    {
-        1, 0, 0, 0,
-        0, 1, 0, 0,
-        0, 0, 1, fov,
-        0, 0, 0, 0
-    };
-    return Matrix4x4(data);
-}
+    float zNear = 0.001;
+    float zFar = 1000;
 
-Matrix4x4 convert2dTo3d()
-{
-    qreal data[] =
+    float m33 = (zNear + zFar) / (zNear - zFar);
+    float m34 = (2 * zNear * zFar) / (zNear - zFar);
+
+    float data[] =
     {
-        1, 0, 0, 0,
-        0, 1, 0, 0,
-        0, 0, 0, 0,
-        0, 0, 0, 1
+        fov, 0, 0, 0,
+        0, fov, 0, 0,
+        0, 0, m33, -1,
+        0, 0, m34, 0
     };
     return Matrix4x4(data);
 }
@@ -139,3 +152,16 @@ QTransform Matrix4x4::toQTransform() const
                       m[4], m[5], m[7],
                       m[12], m[13], m[15]);
 }
+
+Matrix4x4 Matrix4x4::fromQTransform(const QTransform &transform)
+{
+    float data[] =
+    {
+        transform.m11(), transform.m12(), 0, transform.m13(),
+        transform.m21(), transform.m22(), 0, transform.m23(),
+        0, 0, 1, 0,
+        transform.m31(), transform.m32(), 0, transform.m33()
+    };
+
+    return Matrix4x4(data);
+}
diff --git a/matrix4x4.h b/matrix4x4.h
index 588bb40..11ddfb2 100644
--- a/matrix4x4.h
+++ b/matrix4x4.h
@@ -4,27 +4,34 @@
 #include <qnamespace.h>
 #include <QTransform>
 
+#include "point3d.h"
+
 class Matrix4x4
 {
 public:
     Matrix4x4();
-    Matrix4x4(qreal *data);
+    Matrix4x4(float *data);
 
     Matrix4x4 &operator*=(const Matrix4x4 &other);
     Matrix4x4 operator*(const Matrix4x4 &other) const;
 
-    static Matrix4x4 fromRotation(qreal angle, Qt::Axis axis);
-    static Matrix4x4 fromTranslation(qreal dx, qreal dy, qreal dz);
-    static Matrix4x4 fromScale(qreal sx, qreal sy, qreal sz);
-    static Matrix4x4 fromProjection(qreal fov);
-    static Matrix4x4 convert2dTo3d();
+    Point3d operator*(const Point3d &point) const;
+
+    static Matrix4x4 fromRotation(float angle, Qt::Axis axis);
+    static Matrix4x4 fromTranslation(float dx, float dy, float dz);
+    static Matrix4x4 fromScale(float sx, float sy, float sz);
+    static Matrix4x4 fromProjection(float fov);
 
     QTransform toQTransform() const;
+    static Matrix4x4 fromQTransform(const QTransform &transform);
+
+    void setData(float *data);
+    const float *data() const { return m; }
 
-    void setData(qreal *data);
+    Matrix4x4 orderSwapped() const;
 
 private:
-    qreal m[16];
+    float m[16];
 };
 
 #endif
diff --git a/mazescene.cpp b/mazescene.cpp
index 6a516c5..08b4d37 100644
--- a/mazescene.cpp
+++ b/mazescene.cpp
@@ -14,9 +14,9 @@
 #include <qmath.h>
 #include <qdebug.h>
 
-#include "matrix4x4.h"
 #include "scriptwidget.h"
 #include "entity.h"
+#include "modelitem.h"
 
 #ifdef USE_PHONON
 #include "mediaplayer/mediaplayer.h"
@@ -83,6 +83,7 @@ MazeScene::MazeScene(const QVector<Light> &lights, const char *map, int width, i
     types['?'] = 5;
     types['!'] = 6;
     types['='] = 7;
+    types['*'] = 8;
 
     int type;
     for (int y = 0; y < height; ++y) {
@@ -125,6 +126,12 @@ MazeScene::MazeScene(const QVector<Light> &lights, const char *map, int width, i
     updateTransforms();
 }
 
+void MazeScene::addProjectedItem(ProjectedItem *item)
+{
+    addItem(item);
+    m_projectedItems << item;
+}
+
 void MazeScene::addWall(const QPointF &a, const QPointF &b, int type)
 {
     WallItem *item = new WallItem(this, a, b, type);
@@ -135,7 +142,7 @@ void MazeScene::addWall(const QPointF &a, const QPointF &b, int type)
     }
 #endif
     item->setVisible(false);
-    addItem(item);
+    addProjectedItem(item);
     m_walls << item;
 
     if (type == -1)
@@ -157,6 +164,16 @@ static inline QTransform rotatingTransform(qreal angle)
     return transform;
 }
 
+Matrix4x4 Camera::matrix(qreal time) const
+{
+    Matrix4x4 m;
+    m *= Matrix4x4::fromTranslation(-m_pos.x(), 0.04 * qSin(10 * time) + 0.1, -m_pos.y());
+    m *= Matrix4x4::fromRotation(m_yaw + 180, Qt::YAxis);
+    m *= Matrix4x4::fromScale(-1, 1, 1);
+    m *= Matrix4x4::fromRotation(m_pitch, Qt::XAxis);
+    return m;
+}
+
 void MazeScene::drawBackground(QPainter *painter, const QRectF &)
 {
     static QImage floor = QImage("floor.png").convertToFormat(QImage::Format_RGB32);
@@ -172,15 +189,10 @@ void MazeScene::drawBackground(QPainter *painter, const QRectF &)
 
     const QRectF r(1, 1, m_width-2, m_height-2);
 
-    Matrix4x4 m;
-    m *= Matrix4x4::fromRotation(m_camera.yaw(), Qt::YAxis);
-    m *= Matrix4x4::fromRotation(m_camera.pitch(), Qt::XAxis);
-    m *= Matrix4x4::fromProjection(0.5);
-
-    qreal heightOffset = 0.04 * qSin(0.01 * m_walkTime) + 0.1;
+    Matrix4x4 m = m_camera.matrix(0.001 * m_walkTime) * Matrix4x4::fromProjection(1);
 
     Matrix4x4 floorMatrix = Matrix4x4::fromRotation(90, Qt::XAxis);
-    floorMatrix *= Matrix4x4::fromTranslation(-m_camera.pos().x(), heightOffset + 0.5, -m_camera.pos().y());
+    floorMatrix *= Matrix4x4::fromTranslation(0, 0.5, 0);
     floorMatrix *= m;
 
     painter->save();
@@ -189,7 +201,7 @@ void MazeScene::drawBackground(QPainter *painter, const QRectF &)
     painter->restore();
 
     Matrix4x4 ceilingMatrix = Matrix4x4::fromRotation(90, Qt::XAxis);
-    ceilingMatrix *= Matrix4x4::fromTranslation(-m_camera.pos().x(), heightOffset - 0.5, -m_camera.pos().y());
+    ceilingMatrix *= Matrix4x4::fromTranslation(0, -0.5, 0);
     ceilingMatrix *= m;
 
     painter->save();
@@ -198,6 +210,12 @@ void MazeScene::drawBackground(QPainter *painter, const QRectF &)
     painter->restore();
 }
 
+void MazeScene::addEntity(Entity *entity)
+{
+    addProjectedItem(entity);
+    m_entities << entity;
+}
+
 ProjectedItem::ProjectedItem(const QRectF &bounds, bool shadow)
     : m_bounds(bounds)
     , m_shadowItem(0)
@@ -217,6 +235,16 @@ void ProjectedItem::setPosition(const QPointF &a, const QPointF &b)
     m_b = b;
 }
 
+class ResizingView : public QGraphicsView
+{
+protected:
+    void resizeEvent(QResizeEvent *event) {
+        if (scene())
+            scene()->setSceneRect(QRect(QPoint(0, 0), event->size()));
+        QGraphicsView::resizeEvent(event);
+    }
+};
+
 WallItem::WallItem(MazeScene *scene, const QPointF &a, const QPointF &b, int type)
     : ProjectedItem(QRectF(-0.5, -0.5, 1.0, 1.0))
     , m_type(type)
@@ -252,9 +280,6 @@ WallItem::WallItem(MazeScene *scene, const QPointF &a, const QPointF &b, int typ
 
     m_scale = 0.8;
 
-    QPalette palette;
-    palette.setColor(QPalette::Window, QColor(Qt::transparent));
-
     m_childItem = 0;
     QWidget *childWidget = 0;
     if (type == 3 && a.y() == b.y()) {
@@ -263,7 +288,6 @@ WallItem::WallItem(MazeScene *scene, const QPointF &a, const QPointF &b, int typ
         QObject::connect(button, SIGNAL(clicked()), scene, SLOT(toggleDoors()));
         widget->setLayout(new QVBoxLayout);
         widget->layout()->addWidget(button);
-        widget->setPalette(palette);
         childWidget = widget;
         m_scale = 0.3;
     } else if (type == 4) {
@@ -282,6 +306,11 @@ WallItem::WallItem(MazeScene *scene, const QPointF &a, const QPointF &b, int typ
         childWidget = new MediaPlayer(QString());
         m_scale = 0.6;
 #endif
+    } else if (type == 8) {
+        ModelItem *dialog = new ModelItem;
+        childWidget = dialog;
+        scene->addProjectedItem(dialog);
+        m_scale = 0.5;
     } else if (type == 0 || type == 2) {
         static int index;
         if (index == 0) {
@@ -291,7 +320,6 @@ WallItem::WallItem(MazeScene *scene, const QPointF &a, const QPointF &b, int typ
             QObject::connect(checkBox, SIGNAL(toggled(bool)), scene, SLOT(toggleRenderer()), Qt::QueuedConnection);
             widget->setLayout(new QVBoxLayout);
             widget->layout()->addWidget(checkBox);
-            widget->setPalette(palette);
             childWidget = widget;
             m_scale = 0.2;
         } else if (!(index % 7)) {
@@ -333,30 +361,30 @@ bool MazeScene::eventFilter(QObject *target, QEvent *event)
 
     foreach (WallItem *item, m_walls) {
         QGraphicsProxyWidget *proxy = item->childItem();
-        if (!proxy)
-            continue;
-        if (proxy->widget() == widget) {
-            QRectF rect = proxy->boundingRect();
-
-            QPointF center = rect.center();
-
-            qreal scale = item->childScale();
-            scale = qMin(scale / rect.width(), scale / rect.height());
-            proxy->resetMatrix();
-            proxy->translate(0, -0.05);
-            proxy->scale(scale, scale);
-            proxy->translate(-center.x(), -center.y());
-
-            // refresh cache size
-            proxy->setCacheMode(QGraphicsItem::NoCache);
-            proxy->setCacheMode(QGraphicsItem::ItemCoordinateCache);
-            break;
-        }
+        if (proxy && proxy->widget() == widget)
+            item->childResized();
     }
 
     return false;
 }
 
+void WallItem::childResized()
+{
+    QRectF rect = m_childItem->boundingRect();
+
+    QPointF center = rect.center();
+
+    qreal scale = qMin(m_scale / rect.width(), m_scale / rect.height());
+    m_childItem->resetMatrix();
+    m_childItem->translate(0, -0.05);
+    m_childItem->scale(scale, scale);
+    m_childItem->translate(-center.x(), -center.y());
+
+    // refresh cache size
+    m_childItem->setCacheMode(QGraphicsItem::NoCache);
+    m_childItem->setCacheMode(QGraphicsItem::ItemCoordinateCache);
+}
+
 void ProjectedItem::setConstantLight(qreal light)
 {
     if (m_shadowItem)
@@ -434,18 +462,19 @@ void ProjectedItem::updateTransform(const Camera &camera, qreal time)
     QPointF cb = rotation.map(m_b);
 
     if (ca.y() <= 0 && cb.y() <= 0) {
-        setVisible(false);
+        // hide the item by placing it far outside the scene
+        // we could use setVisible() but that causes unnecessary
+        // update to cahced items
+        QTransform transform;
+        transform.translate(-1000, -1000);
+        setTransform(transform);
         return;
     }
 
-    const qreal fov = 0.5;
-
     Matrix4x4 m;
     m *= Matrix4x4::fromRotation(-QLineF(m_b, m_a).angle(), Qt::YAxis);
-    m *= Matrix4x4::fromTranslation(center.x() - camera.pos().x(), 0.04 * qSin(10 * time) + 0.1, center.y() - camera.pos().y());
-    m *= Matrix4x4::fromRotation(camera.yaw(), Qt::YAxis);
-    m *= Matrix4x4::fromRotation(camera.pitch(), Qt::XAxis);
-    m *= Matrix4x4::fromProjection(fov);
+    m *= Matrix4x4::fromTranslation(center.x(), 0, center.y());
+    m *= camera.matrix(time) * Matrix4x4::fromProjection(1);
 
     qreal zm = QLineF(camera.pos(), center).length();
 
@@ -569,8 +598,10 @@ bool MazeScene::tryMove(QPointF &pos, const QPointF &delta, Entity *entity) cons
 
 void MazeScene::updateTransforms()
 {
-    foreach (WallItem *item, m_walls) {
+    foreach (ProjectedItem *item, m_projectedItems)
         item->updateTransform(m_camera, m_walkTime * 0.001);
+
+    foreach (WallItem *item, m_walls) {
         if (item->isVisible()) {
             // embed recursive scene
             if (QGraphicsProxyWidget *child = item->childItem()) {
@@ -591,8 +622,6 @@ void MazeScene::updateTransforms()
             }
         }
     }
-    foreach (Entity *entity, m_entities)
-        entity->updateTransform(m_camera, m_walkTime * 0.001);
 
 #ifdef USE_PHONON
     if (m_player) {
diff --git a/mazescene.h b/mazescene.h
index 7925a9f..2b95873 100644
--- a/mazescene.h
+++ b/mazescene.h
@@ -11,6 +11,8 @@
 #include <QTime>
 #include <QTimeLine>
 
+#include "matrix4x4.h"
+
 class MazeScene;
 class MediaPlayer;
 class Entity;
@@ -40,6 +42,8 @@ public:
     void setPitch(qreal pitch) { m_pitch = pitch; }
     void setPos(const QPointF &pos) { m_pos = pos; }
 
+    Matrix4x4 matrix(qreal time) const;
+
 private:
     qreal m_yaw;
     qreal m_pitch;
@@ -70,10 +74,11 @@ public:
     QPointF a() const { return m_a; }
     QPointF b() const { return m_b; }
 
+    virtual void updateTransform(const Camera &camera, qreal time);
+
     QRectF boundingRect() const;
 
     void setPosition(const QPointF &a, const QPointF &b);
-    void updateTransform(const Camera &camera, qreal time);
     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
     void setAnimationTime(qreal time);
     void setImage(const QImage &image);
@@ -99,13 +104,10 @@ public:
         return m_childItem;
     }
 
-    qreal childScale() const
-    {
-        return m_scale;
-    }
-
     int type() const { return m_type; }
 
+    void childResized();
+
 private:
     QGraphicsProxyWidget *m_childItem;
     int m_type;
@@ -118,6 +120,7 @@ class MazeScene : public QGraphicsScene
 public:
     MazeScene(const QVector<Light> &lights, const char *map, int width, int height);
 
+    void addProjectedItem(ProjectedItem *item);
     void addEntity(Entity *entity);
     void addWall(const QPointF &a, const QPointF &b, int type);
     void drawBackground(QPainter *painter, const QRectF &rect);
@@ -151,6 +154,7 @@ private:
     QVector<QPushButton *> m_buttons;
     QVector<Entity *> m_entities;
     QVector<Light> m_lights;
+    QVector<ProjectedItem *> m_projectedItems;
 
     Camera m_camera;
 
diff --git a/model.cpp b/model.cpp
new file mode 100644
index 0000000..9831138
--- /dev/null
+++ b/model.cpp
@@ -0,0 +1,167 @@
+/****************************************************************************
+**
+** Copyright (C) 2008-2008 Trolltech ASA. All rights reserved.
+**
+** This file is part of the Graphics Dojo project on Trolltech Labs.
+**
+** This file may be used under the terms of the GNU General Public
+** License version 2.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of
+** this file.  Please review the following information to ensure GNU
+** General Public Licensing requirements will be met:
+** http://www.trolltech.com/products/qt/opensource.html
+**
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://www.trolltech.com/products/qt/licensing.html or contact the
+** sales department at sales@trolltech.com.
+**
+** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+****************************************************************************/
+#include "model.h"
+
+#include <QFile>
+#include <QTextStream>
+#include <QVarLengthArray>
+
+#include <QtOpenGL>
+
+Model::Model(const QString &filePath)
+    : m_fileName(QFileInfo(filePath).fileName())
+{
+    QFile file(filePath);
+    if (!file.open(QIODevice::ReadOnly))
+        return;
+
+    Point3d boundsMin( 1e9, 1e9, 1e9);
+    Point3d boundsMax(-1e9,-1e9,-1e9);
+
+    QTextStream in(&file);
+    while (!in.atEnd()) {
+        QString input = in.readLine();
+        if (input.isEmpty() || input[0] == '#')
+            continue;
+
+        QTextStream ts(&input);
+        QString id;
+        ts >> id;
+        if (id == "v") {
+            Point3d p;
+            for (int i = 0; i < 3; ++i) {
+                ts >> p[i];
+                boundsMin[i] = qMin(boundsMin[i], p[i]);
+                boundsMax[i] = qMax(boundsMax[i], p[i]);
+            }
+            m_points << p;
+        } else if (id == "f" || id == "fo") {
+            QVarLengthArray<int, 4> p;
+
+            while (!ts.atEnd()) {
+                QString vertex;
+                ts >> vertex;
+                const int vertexIndex = vertex.split('/').value(0).toInt();
+                if (vertexIndex)
+                    p.append(vertexIndex > 0 ? vertexIndex - 1 : m_points.size() + vertexIndex);
+            }
+
+            for (int i = 0; i < p.size(); ++i) {
+                const int edgeA = p[i];
+                const int edgeB = p[(i + 1) % p.size()];
+
+                if (edgeA < edgeB)
+                    m_edgeIndices << edgeA << edgeB;
+            }
+
+            for (int i = 0; i < 3; ++i)
+                m_pointIndices << p[i];
+
+            if (p.size() == 4)
+                for (int i = 0; i < 3; ++i)
+                    m_pointIndices << p[(i + 2) % 4];
+        }
+    }
+
+    const Point3d bounds = boundsMax - boundsMin;
+    const qreal scale = 1 / qMax(bounds.x / 1, qMax(bounds.y, bounds.z / 1));
+    for (int i = 0; i < m_points.size(); ++i)
+        m_points[i] = (m_points[i] - (boundsMin + bounds * 0.5)) * scale;
+
+    m_size = bounds * scale;
+
+    m_normals.resize(m_points.size());
+    for (int i = 0; i < m_pointIndices.size(); i += 3) {
+        const Point3d a = m_points.at(m_pointIndices.at(i));
+        const Point3d b = m_points.at(m_pointIndices.at(i+1));
+        const Point3d c = m_points.at(m_pointIndices.at(i+2));
+
+        const Point3d normal = cross(b - a, c - a).normalize();
+
+        for (int j = 0; j < 3; ++j)
+            m_normals[m_pointIndices.at(i + j)] += normal;
+    }
+
+    for (int i = 0; i < m_normals.size(); ++i)
+        m_normals[i] = m_normals[i].normalize();
+}
+
+Point3d Model::size() const
+{
+    return m_size;
+}
+
+void Model::render(bool wireframe, bool normals) const
+{
+    glEnable(GL_DEPTH_TEST);
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glDepthFunc(GL_GEQUAL);
+    glDepthMask(true);
+    glDisable(GL_TEXTURE_1D);
+    glDisable(GL_TEXTURE_2D);
+    if (wireframe) {
+        glVertexPointer(3, GL_FLOAT, 0, (float *)m_points.data());
+        glDrawElements(GL_LINES, m_edgeIndices.size(), GL_UNSIGNED_INT, m_edgeIndices.data());
+    } else {
+        glEnable(GL_LIGHTING);
+        glEnable(GL_LIGHT0);
+        glEnable(GL_COLOR_MATERIAL);
+        glShadeModel(GL_SMOOTH);
+
+        glEnableClientState(GL_NORMAL_ARRAY);
+        glVertexPointer(3, GL_FLOAT, 0, (float *)m_points.data());
+        glNormalPointer(GL_FLOAT, 0, (float *)m_normals.data());
+        glDrawElements(GL_TRIANGLES, m_pointIndices.size(), GL_UNSIGNED_INT, m_pointIndices.data());
+
+        glDisableClientState(GL_NORMAL_ARRAY);
+        glDisable(GL_COLOR_MATERIAL);
+        glDisable(GL_LIGHT0);
+        glDisable(GL_LIGHTING);
+    }
+
+    if (normals) {
+        QVector<Point3d> normals;
+        for (int i = 0; i < m_normals.size(); ++i)
+            normals << m_points.at(i) << (m_points.at(i) + m_normals.at(i) * 0.02f);
+        glVertexPointer(3, GL_FLOAT, 0, (float *)normals.data());
+        glDrawArrays(GL_LINES, 0, normals.size());
+    }
+    glDisableClientState(GL_VERTEX_ARRAY);
+    glDisable(GL_DEPTH_TEST);
+}
+
+void Model::render(QPainter *painter, const Matrix4x4 &matrix, bool normals) const
+{
+    QVector<QLineF> lines;
+    for (int i = 0; i < m_edgeIndices.size(); i += 2)
+        lines << QLineF((matrix * m_points.at(m_edgeIndices.at(i))).toQPoint(),
+                        (matrix * m_points.at(m_edgeIndices.at(i+1))).toQPoint());
+
+    if (normals) {
+        for (int i = 0; i < m_normals.size(); ++i)
+            lines << QLineF((matrix * m_points.at(i)).toQPoint(),
+                            (matrix * (m_points.at(i) + m_normals.at(i) * 0.02f)).toQPoint());
+    }
+
+    painter->drawLines(lines);
+}
diff --git a/model.h b/model.h
new file mode 100644
index 0000000..e6f2a20
--- /dev/null
+++ b/model.h
@@ -0,0 +1,60 @@
+/****************************************************************************
+**
+** Copyright (C) 2008-2008 Trolltech ASA. All rights reserved.
+**
+** This file is part of the Graphics Dojo project on Trolltech Labs.
+**
+** This file may be used under the terms of the GNU General Public
+** License version 2.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of
+** this file.  Please review the following information to ensure GNU
+** General Public Licensing requirements will be met:
+** http://www.trolltech.com/products/qt/opensource.html
+**
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://www.trolltech.com/products/qt/licensing.html or contact the
+** sales department at sales@trolltech.com.
+**
+** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+****************************************************************************/
+#ifndef MODEL_H
+#define MODEL_H
+
+#include <QPainter>
+#include <QString>
+#include <QVector>
+
+#include <math.h>
+
+#include "point3d.h"
+#include "matrix4x4.h"
+
+class Model
+{
+public:
+    Model() {}
+    Model(const QString &filePath);
+
+    void render(bool wireframe = false, bool normals = false) const;
+    void render(QPainter *painter, const Matrix4x4 &matrix, bool normals = false) const;
+
+    QString fileName() const { return m_fileName; }
+    int faces() const { return m_pointIndices.size() / 3; }
+    int edges() const { return m_edgeIndices.size() / 2; }
+    int points() const { return m_points.size(); }
+
+    Point3d size() const;
+
+private:
+    QString m_fileName;
+    QVector<Point3d> m_points;
+    QVector<Point3d> m_normals;
+    QVector<int> m_edgeIndices;
+    QVector<int> m_pointIndices;
+    Point3d m_size;
+};
+
+#endif
diff --git a/modelitem.cpp b/modelitem.cpp
new file mode 100644
index 0000000..7f081e4
--- /dev/null
+++ b/modelitem.cpp
@@ -0,0 +1,215 @@
+/****************************************************************************
+**
+** Copyright (C) 2008-2008 Trolltech ASA. All rights reserved.
+**
+** This file is part of the Graphics Dojo project on Trolltech Labs.
+**
+** This file may be used under the terms of the GNU General Public
+** License version 2.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of
+** this file.  Please review the following information to ensure GNU
+** General Public Licensing requirements will be met:
+** http://www.trolltech.com/products/qt/opensource.html
+**
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://www.trolltech.com/products/qt/licensing.html or contact the
+** sales department at sales@trolltech.com.
+**
+** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+****************************************************************************/
+#include "modelitem.h"
+#include "model.h"
+
+#include <QtGui>
+#include <QtOpenGL>
+
+#include "mazescene.h"
+
+#ifndef GL_MULTISAMPLE
+#define GL_MULTISAMPLE  0x809D
+#endif
+
+void ModelItem::updateTransform(const Camera &camera, qreal time)
+{
+    ProjectedItem::updateTransform(camera, time);
+
+    setTransform(QTransform());
+    m_matrix = Matrix4x4::fromTranslation(3, 0, 7) * camera.matrix(time);
+}
+
+QRectF ModelItem::boundingRect() const
+{
+    return scene()->sceneRect();
+}
+
+void ModelItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
+{
+    if (!m_model)
+        return;
+
+    Matrix4x4 projectionMatrix = Matrix4x4::fromProjection(1);
+    projectionMatrix *= Matrix4x4::fromQTransform(painter->transform());
+
+    Matrix4x4 modelMatrix;
+    const int delta = m_time.elapsed() - m_lastTime;
+    m_rotation += m_angularMomentum * (delta / 1000.0);
+    m_lastTime += delta;
+
+    Point3d size = m_model->size();
+    float extent = qSqrt(2.0);
+    float scale = 1 / qMax(size.y, qMax(size.x / extent, size.z / extent));
+    modelMatrix *= Matrix4x4::fromScale(scale, -scale, scale);
+
+    modelMatrix *= Matrix4x4::fromRotation(m_rotation.z, Qt::ZAxis);
+    modelMatrix *= Matrix4x4::fromRotation(m_rotation.y, Qt::YAxis);
+    modelMatrix *= Matrix4x4::fromRotation(m_rotation.x, Qt::XAxis);
+
+    ProjectedItem::update();
+
+    if (painter->paintEngine()->type() != QPaintEngine::OpenGL) {
+        m_wireframe->setEnabled(false);
+        m_wireframe->setChecked(false);
+        m_wireframeEnabled = false;
+        painter->setTransform(QTransform());
+        painter->setPen(m_modelColor);
+        m_model->render(painter, modelMatrix * m_matrix * projectionMatrix, m_normalsEnabled);
+        return;
+    }
+
+    m_wireframe->setEnabled(true);
+
+    glClearDepth(0);
+    glClear(GL_DEPTH_BUFFER_BIT);
+
+    glMatrixMode(GL_PROJECTION);
+    glPushMatrix();
+    glLoadIdentity();
+    glOrtho(0, painter->device()->width(), painter->device()->height(), 0, -1, 1);
+    glMultMatrixf(projectionMatrix.data());
+
+    glMatrixMode(GL_MODELVIEW);
+    glPushMatrix();
+    glLoadMatrixf(m_matrix.data());
+
+    const float ambient[] = { 0.1, 0.1, 0.1, 1 };
+    const float pos[] = { 50, -500, 200 };
+    glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
+    glLightfv(GL_LIGHT0, GL_POSITION, pos);
+
+    glMultMatrixf(modelMatrix.data());
+
+    glColor4f(m_modelColor.redF(), m_modelColor.greenF(), m_modelColor.blueF(), 1.0f);
+
+    glEnable(GL_MULTISAMPLE);
+    m_model->render(m_wireframeEnabled, m_normalsEnabled);
+    glDisable(GL_MULTISAMPLE);
+
+    glPopMatrix();
+
+    glMatrixMode(GL_PROJECTION);
+    glPopMatrix();
+}
+
+
+ModelItem::ModelItem()
+    : ProjectedItem(QRectF(), false)
+    , m_wireframeEnabled(false)
+    , m_normalsEnabled(false)
+    , m_modelColor(153, 255, 0)
+    , m_model(0)
+    , m_lastTime(0)
+    , m_distance(1.4f)
+    , m_angularMomentum(0, 40, 0)
+{
+    QPointF pos(3, 7);
+    setPosition(pos, pos);
+    setLayout(new QVBoxLayout);
+
+    m_modelButton = new QPushButton(tr("Load model"));
+    connect(m_modelButton, SIGNAL(clicked()), this, SLOT(loadModel()));
+#ifndef QT_NO_CONCURRENT
+    connect(&m_modelLoader, SIGNAL(finished()), this, SLOT(modelLoaded()));
+#endif
+    layout()->addWidget(m_modelButton);
+
+    m_wireframe = new QCheckBox(tr("Render as wireframe"));
+    connect(m_wireframe, SIGNAL(toggled(bool)), this, SLOT(enableWireframe(bool)));
+    layout()->addWidget(m_wireframe);
+
+    QCheckBox *normals = new QCheckBox(tr("Display normals vectors"));
+    connect(normals, SIGNAL(toggled(bool)), this, SLOT(enableNormals(bool)));
+    layout()->addWidget(normals);
+
+    QPushButton *colorButton = new QPushButton(tr("Choose model color"));
+    connect(colorButton, SIGNAL(clicked()), this, SLOT(setModelColor()));
+    layout()->addWidget(colorButton);
+
+    loadModel(QLatin1String("qt.obj"));
+    m_time.start();
+}
+
+static Model *loadModel(const QString &filePath)
+{
+    return new Model(filePath);
+}
+
+void ModelItem::loadModel()
+{
+    loadModel(QFileDialog::getOpenFileName(0, tr("Choose model"), QString(), QLatin1String("*.obj")));
+}
+
+void ModelItem::loadModel(const QString &filePath)
+{
+    if (filePath.isEmpty())
+        return;
+
+    m_modelButton->setEnabled(false);
+    QApplication::setOverrideCursor(Qt::BusyCursor);
+#ifndef QT_NO_CONCURRENT
+    m_modelLoader.setFuture(QtConcurrent::run(::loadModel, filePath));
+#else
+    setModel(::loadModel(filePath));
+    modelLoaded();
+#endif
+}
+
+void ModelItem::modelLoaded()
+{
+#ifndef QT_NO_CONCURRENT
+    setModel(m_modelLoader.result());
+#endif
+    m_modelButton->setEnabled(true);
+    QApplication::restoreOverrideCursor();
+}
+
+void ModelItem::setModel(Model *model)
+{
+    delete m_model;
+    m_model = model;
+
+    ProjectedItem::update();
+}
+
+void ModelItem::enableWireframe(bool enabled)
+{
+    m_wireframeEnabled = enabled;
+    ProjectedItem::update();
+}
+
+void ModelItem::enableNormals(bool enabled)
+{
+    m_normalsEnabled = enabled;
+    ProjectedItem::update();
+}
+
+void ModelItem::setModelColor()
+{
+    const QColor color = QColorDialog::getColor(m_modelColor);
+    if (color.isValid()) {
+        m_modelColor = color;
+        ProjectedItem::update();
+    }
+}
diff --git a/modelitem.h b/modelitem.h
new file mode 100644
index 0000000..bd329ad
--- /dev/null
+++ b/modelitem.h
@@ -0,0 +1,89 @@
+/****************************************************************************
+**
+** Copyright (C) 2008-2008 Trolltech ASA. All rights reserved.
+**
+** This file is part of the Graphics Dojo project on Trolltech Labs.
+**
+** This file may be used under the terms of the GNU General Public
+** License version 2.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of
+** this file.  Please review the following information to ensure GNU
+** General Public Licensing requirements will be met:
+** http://www.trolltech.com/products/qt/opensource.html
+**
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://www.trolltech.com/products/qt/licensing.html or contact the
+** sales department at sales@trolltech.com.
+**
+** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+****************************************************************************/
+#ifndef OPENGLSCENE_H
+#define OPENGLSCENE_H
+
+#include "point3d.h"
+
+#include <QCheckBox>
+#include <QWidget>
+#include <QTime>
+
+#ifndef QT_NO_CONCURRENT
+#include <QFutureWatcher>
+#endif
+
+#include "mazescene.h"
+
+class Model;
+
+class ModelItem : public QWidget, public ProjectedItem
+{
+    Q_OBJECT
+
+public:
+    ModelItem();
+
+    void updateTransform(const Camera &camera, qreal time);
+
+    QRectF boundingRect() const;
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
+
+public slots:
+    void enableWireframe(bool enabled);
+    void enableNormals(bool enabled);
+    void setModelColor();
+    void loadModel();
+    void loadModel(const QString &filePath);
+    void modelLoaded();
+
+private:
+    void setModel(Model *model);
+
+    bool m_wireframeEnabled;
+    bool m_normalsEnabled;
+    bool m_useQPainter;
+
+    QColor m_modelColor;
+
+    Model *m_model;
+
+    QTime m_time;
+    int m_lastTime;
+    int m_mouseEventTime;
+
+    float m_distance;
+    Point3d m_rotation;
+    Point3d m_angularMomentum;
+    Point3d m_accumulatedMomentum;
+
+    QWidget *m_modelButton;
+    QCheckBox *m_wireframe;
+
+#ifndef QT_NO_CONCURRENT
+    QFutureWatcher<Model *> m_modelLoader;
+#endif
+    Matrix4x4 m_matrix;
+};
+
+#endif
diff --git a/point3d.h b/point3d.h
new file mode 100644
index 0000000..8b79ba4
--- /dev/null
+++ b/point3d.h
@@ -0,0 +1,122 @@
+/****************************************************************************
+**
+** Copyright (C) 2008-2008 Trolltech ASA. All rights reserved.
+**
+** This file is part of the Graphics Dojo project on Trolltech Labs.
+**
+** This file may be used under the terms of the GNU General Public
+** License version 2.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of
+** this file.  Please review the following information to ensure GNU
+** General Public Licensing requirements will be met:
+** http://www.trolltech.com/products/qt/opensource.html
+**
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://www.trolltech.com/products/qt/licensing.html or contact the
+** sales department at sales@trolltech.com.
+**
+** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+****************************************************************************/
+#ifndef POINT3D_H
+#define POINT3D_H
+
+#include "math.h"
+
+#include <qglobal.h>
+#include <qpoint.h>
+
+struct Point3d
+{
+    float x, y, z;
+
+    Point3d()
+        : x(0)
+        , y(0)
+        , z(0)
+    {
+    }
+
+    Point3d(float x_, float y_, float z_)
+        : x(x_)
+        , y(y_)
+        , z(z_)
+    {
+    }
+
+    Point3d operator+(const Point3d &p) const
+    {
+        return Point3d(*this) += p;
+    }
+
+    Point3d operator-(const Point3d &p) const
+    {
+        return Point3d(*this) -= p;
+    }
+
+    Point3d operator*(float f) const
+    {
+        return Point3d(*this) *= f;
+    }
+
+
+    Point3d &operator+=(const Point3d &p)
+    {
+        x += p.x;
+        y += p.y;
+        z += p.z;
+        return *this;
+    }
+
+    Point3d &operator-=(const Point3d &p)
+    {
+        x -= p.x;
+        y -= p.y;
+        z -= p.z;
+        return *this;
+    }
+
+    Point3d &operator*=(float f)
+    {
+        x *= f;
+        y *= f;
+        z *= f;
+        return *this;
+    }
+
+    Point3d normalize() const
+    {
+        float r = 1. / sqrt(x * x + y * y + z * z);
+        return Point3d(x * r, y * r, z * r);
+    }
+
+    float &operator[](unsigned int index) {
+        Q_ASSERT(index < 3);
+        return (&x)[index];
+    }
+
+    const float &operator[](unsigned int index) const {
+        Q_ASSERT(index < 3);
+        return (&x)[index];
+    }
+
+    QPointF toQPoint() const {
+        return QPointF(x, y);
+    }
+};
+
+inline float dot(const Point3d &a, const Point3d &b)
+{
+    return a.x * b.x + a.y * b.y + a.z * b.z;
+}
+
+inline Point3d cross(const Point3d &a, const Point3d &b)
+{
+    return Point3d(a.y * b.z - a.z * b.y,
+                   a.z * b.x - a.x * b.z,
+                   a.x * b.y - a.y * b.x);
+}
+
+#endif
diff --git a/qt.obj b/qt.obj
new file mode 100644
index 0000000..d78cd55
--- /dev/null
+++ b/qt.obj
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diff --git a/qt3d.pro b/qt3d.pro
index 18b3cc5..bd2c9e8 100644
--- a/qt3d.pro
+++ b/qt3d.pro
@@ -7,6 +7,8 @@ TARGET =
 DEPENDPATH += .
 INCLUDEPATH += .
 
+QMAKE_CXXFLAGS += -g
+
 QT += webkit opengl script
 
 contains(QT_CONFIG, phonon):{
@@ -31,3 +33,7 @@ DEPLOYMENT_PLUGIN += phonon_ds9 phonon_waveout
 # Input
 HEADERS += entity.h mazescene.h matrix4x4.h scriptwidget.h
 SOURCES += main.cpp entity.cpp mazescene.cpp matrix4x4.cpp scriptwidget.cpp
+
+# From modelviewer
+HEADERS += modelitem.h point3d.h model.h
+SOURCES += model.cpp modelitem.cpp