// gets called at every program start and when a new file is opened in the viewer
void AbstractNavigation::sceneChanged(Group * scene)
{
AxisAlignedBoundingBox bb = scene->boundingBox();
m_BBRadius = bb.radius();
m_frontView = glm::lookAt(bb.center() + glm::vec3(0.f, 0.f, bb.radius()*2.5), bb.center(), glm::vec3(0.f, 1.f, 0.f));
setFromMatrix(topRightView());
updateCamera();
}
// Workaround to avoid invisible objects due to wrong clipping planes
// all scenes are scaled to a radius of 5
void AbstractNavigation::rescaleScene( Group * scene )
{
AxisAlignedBoundingBox bb = scene->boundingBox();
glm::mat4 scale_matrix = glm::scale(glm::vec3(5.0f / bb.radius()));
m_sceneTransform = scale_matrix * scene->transform();
scene->setTransform(m_sceneTransform);
}
void PathTracingBVH::addToGeometry(Node *node) {
AxisAlignedBoundingBox aabb = node->boundingBox();
int aabbIndex = m_geometry->size();
m_geometry->push_back(glm::vec4()); //llf dummy
m_geometry->push_back(glm::vec4()); //urb dummy
//add triangles
for (auto child : node->children()) {
if (child->children().size() == 0) { //the current child is a leaf ==> it is a triangle object
TriangleObject *triangleObject = dynamic_cast<TriangleObject *>(child);
if (triangleObject == nullptr) { //we have to be safe because it could also be an empty Group
qDebug() << "PathTracingBVH : addToGeometry(Node *) : dynamic cast to TriangleObject * failed";
continue;
}
p_TriangleList triangles = triangleObject->triangles();
for (int i = 2; i < triangles->size(); i += 3) {
m_geometry->push_back(glm::vec4(triangles->at(i - 2), 3.0f)); // data1
m_geometry->push_back(glm::vec4(triangles->at(i - 1), 0.0f)); // data2
m_geometry->push_back(glm::vec4(triangles->at(i ), 0.0f)); // data3
}
} else { //internal node
addToGeometry(child);
}
}
glm::vec3 aabbEnlargement = aabb.radius() * glm::vec3(0.000001f, 0.000001f, 0.000001f);
m_geometry->at(aabbIndex) = glm::vec4(
aabb.llf() - aabbEnlargement, //llf
0.0f //we are a bounding box
); //data1
m_geometry->at(aabbIndex + 1) = glm::vec4(
aabb.urb() + aabbEnlargement, //urb
float(m_geometry->size()) // points to one behind the last entry in geometry list,
// that is the next object on the same hierarchy level (or a higher hierarchy level
// if there is none on the same)
); //data2
}