QVector<Eigen::AlignedBox3d> splitBox( const Eigen::AlignedBox3d & box, Vector3 axis )
{
Eigen::AlignedBox3d b1 = box, b2 = box;
Vector3 delta = axis.array() * ((box.sizes() * 0.5).array());
return QVector<Eigen::AlignedBox3d>() << box.intersection(b1.translate(-delta)) <<
box.intersection(b2.translate(delta));
}
void Viewer::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if(false)
{
// Default camera:
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-2, 2, -1.5, 1.5, 1, 40);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0, 0, -3);
glRotatef(50, 1, 0, 0);
glRotatef(70, 0, 1, 0);
// Draw a white grid "floor" for the tetrahedron to sit on.
glColor3d(0.8, 0.8, 0.7);
glBegin(GL_LINES);
for (GLfloat i = -2.5; i <= 2.5; i += 0.25) {
glVertex3f(i, 2.5, 0); glVertex3f(i, -2.5, 0);
glVertex3f(2.5, i, 0); glVertex3f(-2.5, i, 0);
}
glEnd();
// Draw the tetrahedron.
if(false)
{
glBegin(GL_TRIANGLE_STRIP);
glColor3f(1, 1, 1); glVertex3f(0, 0, 2);
glColor3f(1, 0, 0); glVertex3f(-1, 1, 0);
glColor3f(0, 1, 0); glVertex3f(1, 1, 0);
glColor3f(0, 0, 1); glVertex3f(0, -1.4f, 0);
glColor3f(1, 1, 1); glVertex3f(0, 0, 2);
glColor3f(1, 0, 0); glVertex3f(-1, 1, 0);
glEnd();
}
}
if( !isReady ) return;
// Setup camera
Eigen::Vector3d center, eye;
{
// Bounding volume
{
Eigen::Vector3d dir( cos(t), sin(t), 0.25);
Eigen::AlignedBox3d bbox; for(auto v : vertices) bbox.extend(v);
double radius = bbox.sizes().norm() * 2.75;
center = bbox.center();
eye = center + (dir.normalized() * radius);
}
auto projectionMatrix = perspective<double>(20, 1.0, 0.01, 1000);
auto cameraMatrix = lookAt< Eigen::Vector3d >(eye, center, Eigen::Vector3d(0,0,1));
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glLoadMatrixd( projectionMatrix.data() );
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glLoadMatrixd( cameraMatrix.data() );
}
// Added user rotation
{
glRotatef(xRot / 16.0, 1.0, 0.0, 0.0);
glRotatef(yRot / 16.0, 0.0, 1.0, 0.0);
glRotatef(zRot / 16.0, 0.0, 0.0, 1.0);
}
glColor3d(1,0,0);
// Render geometry
{
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glColor3d(0,0,0);
glDisable(GL_LIGHTING);
glLineWidth(6);
//RenderMesh();
glClear(GL_DEPTH_BUFFER_BIT);
//glEnable(GL_LIGHTING);
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glColor3d(0,0,0);
RenderMesh();
}
}