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#include "model.h"
#include <QFile>
#include <QSet>
#include <QTextStream>
#include <QVarLengthArray>
#include "GL/gl.h"
static Point3d readPoint(QTextStream &ts)
{
Point3d p;
ts >> p.x >> p.y >> p.z;
return p;
}
struct Edge
{
int pointA;
int pointB;
};
uint qHash(const Edge &edge)
{
return qHash(edge.pointA) ^ qHash(edge.pointB);
}
bool operator==(const Edge &a, const Edge &b)
{
return (a.pointA == b.pointA && a.pointB == b.pointB)
|| (a.pointA == b.pointB && a.pointB == b.pointA);
}
Model::Model(const QString &filename)
{
QFile file(filename);
if (!file.open(QIODevice::ReadOnly))
return;
QSet<Edge> edges;
Point3d min( 1e9, 1e9, 1e9);
Point3d max(-1e9,-1e9,-1e9);
QVector<Point3d> pointData;
QVector<Point3d> normalData;
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 = readPoint(ts);
p.y = -p.y;
pointData << p;
normalData << Point3d();
min.x = qMin(min.x, p.x);
min.y = qMin(min.y, p.y);
min.z = qMin(min.z, p.z);
max.x = qMax(max.x, p.x);
max.y = qMax(max.y, p.y);
max.z = qMax(max.z, p.z);
} else if (id == "f" || id == "fo") {
QVarLengthArray<int, 4> p;
while (!ts.atEnd()) {
QString vertex;
ts >> vertex;
int index;
QTextStream vertexStream(&vertex);
vertexStream >> index;
if (vertexStream.status() == QTextStream::Ok)
p.append(index - 1);
}
for (int i = 0; i < p.size(); ++i) {
Edge edge = { p[i], p[(i + 1) % p.size()] };
edges << edge;
}
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];
}
}
#if 0
for (int i = 0; i < m_pointIndices.size(); ++i) {
Point3d p1 = pointData.at(m_pointIndices.at(i));
for (int j = 0; j < m_pointIndices.at(i); ++j) {
Point3d p2 = pointData.at(j);
if (p1.x == p2.x && p1.y == p2.y && p1.z == p2.z) {
m_pointIndices[i] = j;
break;
}
}
}
#endif
Point3d bounds = max - min;
qreal scale = 1 / qMax(bounds.x, qMax(bounds.y, bounds.z));
for (int i = 0; i < pointData.size(); ++i) {
Point3d &p = pointData[i];
p.x -= min.x + bounds.x * 0.5;
p.y -= min.y + bounds.y * 0.5;
p.z -= min.z + bounds.z * 0.5;
p.x *= scale;
p.y *= scale;
p.z *= scale;
}
QVector<int> counts(normalData.size());
for (int i = 0; i < counts.size(); ++i)
counts[i] = 0;
for (int i = 0; i < m_pointIndices.size(); i += 3) {
const Point3d a = pointData.at(m_pointIndices.at(i));
const Point3d b = pointData.at(m_pointIndices.at(i+1));
const Point3d c = pointData.at(m_pointIndices.at(i+2));
Point3d normal = cross(c - a, b - a).normalize();
for (int j = 0; j < 3; ++j) {
Point3d old = normalData.at(m_pointIndices.at(i + j));
normalData[m_pointIndices.at(i + j)] = old + normal;
++counts[m_pointIndices.at(i + j)];
}
}
for (int i = 0; i < normalData.size(); ++i) {
float r = 1. / counts.at(i);
normalData[i] = normalData.at(i) * r;//.normalize();
}
#if 0
Point3d normal;
for (int i = 0; i < m_pointIndices.size(); ++i) {
#if 0
if ((i % 3) == 0) {
Point3d a = pointData.at(m_pointIndices.at(i));
Point3d b = pointData.at(m_pointIndices.at(i+1));
Point3d c = pointData.at(m_pointIndices.at(i+2));
normal = cross(c - a, b - a).normalize();
//float len = normal.x * normal.x +normal.y * normal.y +normal.z * normal.z;
}
#endif
m_points << pointData.at(m_pointIndices.at(i));
m_normals << normalData.at(m_pointIndices.at(i)).normalize();
#if 0
Point3d p = m_points.last();
Point3d n = m_normals.last();
printf("Index: %d, point: %f %f %f, normal: %f %f %f\n", m_pointIndices.at(i),
p.x, p.y, p.z,
n.x, n.y, n.z);
#endif
}
#endif
m_points = pointData;
m_normals = normalData;
foreach(const Edge &edge, QVector<Edge>::fromList(edges.toList()))
m_edges << pointData.at(edge.pointA) << pointData.at(edge.pointB);
}
void Model::render(bool wireframe, bool normals) const
{
glEnableClientState(GL_VERTEX_ARRAY);
if (wireframe) {
glColor3f(0, 0, 0);
glVertexPointer(3, GL_FLOAT, 0, m_edges.data());
glDrawArrays(GL_LINES, 0, m_edges.size());
} else {
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_COLOR_MATERIAL);
glShadeModel(GL_SMOOTH);
glEnable(GL_DEPTH_TEST);
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_DEPTH_TEST);
glDisable(GL_COLOR_MATERIAL);
glDisable(GL_LIGHT0);
glDisable(GL_LIGHTING);
}
glDisableClientState(GL_VERTEX_ARRAY);
if (normals) {
glColor3f(1, 0, 0);
glBegin(GL_LINES);
for (int i = 0; i < m_normals.size(); ++i) {
Point3d a = m_points.at(i);
Point3d b = m_points.at(i) + m_normals.at(i) * 0.02;
glVertex3f(a.x, a.y, a.z);
glVertex3f(b.x, b.y, b.z);
}
glEnd();
}
}
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