1 files changed, 107 insertions, 0 deletions
diff --git a/src/datavis3d/utils/meshloader.cpp b/src/datavis3d/utils/meshloader.cpp
new file mode 100644
index 00000000..b94c5a46
--- /dev/null
+++ b/src/datavis3d/utils/meshloader.cpp
@@ -0,0 +1,107 @@
+#include "meshloader_p.h"
+
+#include <QFile>
+#include <QStringList>
+#include <QVector>
+#include <QVector2D>
+#include <QVector3D>
+
+#include <QDebug>
+
+QTCOMMERCIALDATAVIS3D_BEGIN_NAMESPACE
+
+QString slashTag = QStringLiteral("/");
+
+bool MeshLoader::loadOBJ(QString path,
+                         QVector<QVector3D> &out_vertices,
+                         QVector<QVector2D> &out_uvs,
+                         QVector<QVector3D> &out_normals)
+{
+    qDebug() << "Loading OBJ file" << path;
+
+    QVector<unsigned int> vertexIndices, uvIndices, normalIndices;
+    QVector<QVector3D> temp_vertices;
+    QVector<QVector2D> temp_uvs;
+    QVector<QVector3D> temp_normals;
+
+    QFile file(path);
+    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
+        qWarning("Cannot open the file");
+        return false;
+    }
+
+    QTextStream textIn(&file);
+    while (!textIn.atEnd()) {
+        QString line = textIn.readLine();
+        QStringList lineContents = line.split(QStringLiteral(" "));
+        if (!lineContents.at(0).compare(QStringLiteral("v"))) {
+            QVector3D vertex;
+            vertex.setX(lineContents.at(1).toFloat());
+            vertex.setY(lineContents.at(2).toFloat());
+            vertex.setZ(lineContents.at(3).toFloat());
+            temp_vertices.append(vertex);
+        }
+        else if (!lineContents.at(0).compare(QStringLiteral("vt"))) {
+            QVector2D uv;
+            uv.setX(lineContents.at(1).toFloat());
+            uv.setY(lineContents.at(2).toFloat()); // invert this if using DDS textures
+            temp_uvs.append(uv);
+        }
+        else if (!lineContents.at(0).compare(QStringLiteral("vn"))) {
+            QVector3D normal;
+            normal.setX(lineContents.at(1).toFloat());
+            normal.setY(lineContents.at(2).toFloat());
+            normal.setZ(lineContents.at(3).toFloat());
+            temp_normals.append(normal);
+        }
+        else if (!lineContents.at(0).compare(QStringLiteral("f"))) {
+            unsigned int vertexIndex[3], uvIndex[3], normalIndex[3];
+            QStringList set1 = lineContents.at(1).split(slashTag);
+            QStringList set2 = lineContents.at(2).split(slashTag);
+            QStringList set3 = lineContents.at(3).split(slashTag);
+            vertexIndex[0] = set1.at(0).toUInt();
+            vertexIndex[1] = set2.at(0).toUInt();
+            vertexIndex[2] = set3.at(0).toUInt();
+            uvIndex[0] = set1.at(1).toUInt();
+            uvIndex[1] = set2.at(1).toUInt();
+            uvIndex[2] = set3.at(1).toUInt();
+            normalIndex[0] = set1.at(2).toUInt();
+            normalIndex[1] = set2.at(2).toUInt();
+            normalIndex[2] = set3.at(2).toUInt();
+            vertexIndices.append(vertexIndex[0]);
+            vertexIndices.append(vertexIndex[1]);
+            vertexIndices.append(vertexIndex[2]);
+            uvIndices.append(uvIndex[0]);
+            uvIndices.append(uvIndex[1]);
+            uvIndices.append(uvIndex[2]);
+            normalIndices.append(normalIndex[0]);
+            normalIndices.append(normalIndex[1]);
+            normalIndices.append(normalIndex[2]);
+        }
+        else {
+            //qWarning("Line did not contain usable data");
+        }
+    }
+
+    // For each vertex of each triangle
+    for (int i = 0; i < vertexIndices.size(); i++) {
+        // Get the indices of its attributes
+        unsigned int vertexIndex = vertexIndices[i];
+        unsigned int uvIndex = uvIndices[i];
+        unsigned int normalIndex = normalIndices[i];
+
+        // Get the attributes thanks to the index
+        QVector3D vertex = temp_vertices[vertexIndex - 1];
+        QVector2D uv = temp_uvs[uvIndex - 1];
+        QVector3D normal = temp_normals[normalIndex - 1];
+
+        // Put the attributes in buffers
+        out_vertices.append(vertex);
+        out_uvs.append(uv);
+        out_normals.append(normal);
+    }
+
+    return true;
+}
+
+QTCOMMERCIALDATAVIS3D_END_NAMESPACE