bullet::Collider::Ptr
bullet::Collider::linearFactor(Vector3::Ptr values)
{
const bool changed = fabsf(values->x() - _linearFactor->x()) > 1e-3f
|| fabsf(values->y() - _linearFactor->y()) > 1e-3f
|| fabsf(values->z() - _linearFactor->z()) > 1e-3f;
_linearFactor->copyFrom(values);
if (changed)
_propertiesChanged->execute(std::static_pointer_cast<Collider>(shared_from_this()));
return std::static_pointer_cast<Collider>(shared_from_this());
}
void
Matrix4x4::decompose(Vector3::Ptr translation,
Quaternion::Ptr rotation,
Vector3::Ptr scaling) const
{
static auto matrixR = Matrix4x4::create();
decomposeQR(rotation, matrixR);
const std::vector<float>& matR = matrixR->_m;
scaling->setTo(matR[0], matR[5], matR[10]);
#ifdef DEBUG
if (fabsf(matR[1]) > 1e-3f || fabsf(matR[2]) > 1e-3f || fabsf(matR[6]) > 1e-3f)
std::cout << "Warning: Matrix decomposition assumes the following composition order : scaling, rotation, and translation." << std::endl;
#endif // DEBUG
translation->setTo(_m[3], _m[7], _m[11]);
}
Vector3::Ptr
bullet::PhysicsWorld::getColliderAngularVelocity(Collider::ConstPtr collider,
Vector3::Ptr output) const
{
if (output == nullptr)
output = Vector3::create(0.0f, 0.0f, 0.0f);
auto foundColliderIt = _colliderMap.find(std::const_pointer_cast<Collider>(collider));
if (foundColliderIt == _colliderMap.end())
return output;
auto rigidBody = foundColliderIt->second->rigidBody();
auto vec = rigidBody->getAngularVelocity();
return output->setTo(vec.x(), vec.y(), vec.z());
}
void
Geometry::getHitNormal(uint triangle, Vector3::Ptr hitNormal)
{
auto normalBuffer = vertexBuffer("normal");
auto& normalData = normalBuffer->data();
auto normalPtr = &normalData[0];
auto normalVertexSize = normalBuffer->vertexSize();
auto normalOffset = std::get<2>(*normalBuffer->attribute("normal"));
auto& indicesData = _indexBuffer->data();
auto v0 = Vector3::create(normalPtr + indicesData[triangle] * normalVertexSize + normalOffset);
auto v1 = Vector3::create(normalPtr + indicesData[triangle] * normalVertexSize + normalOffset);
auto v2 = Vector3::create(normalPtr + indicesData[triangle] * normalVertexSize + normalOffset);
auto edge1 = Vector3::create(v1)->subtract(v0)->normalize();
auto edge2 = Vector3::create(v2)->subtract(v0)->normalize();
hitNormal->copyFrom(edge2)->cross(edge1);
}
int
main(int argc, char** argv)
{
auto canvas = Canvas::create("Minko Example - Leap Motion");
// scene set-up
auto sceneManager = SceneManager::create(canvas);
auto sceneNode = Node::create("engine")
->addComponent(Transform::create());
auto cameraNode = Node::create("cameraNode")
->addComponent(Transform::create());
// Leap Motion-based controls
auto controller = input::leap::Controller::create(canvas);
const float MIN_DELTA_HAND_DISTANCE = 5.0f;
const float RELATIVE_MOVE_THRESHOLD = 1.0f;
const clock_t START_CLOCK = clock();
// frame-persistant variables
float relativeMove = 0.0f;
auto swipeDirection = Vector3::create();
float goalExplosionValue = 1.0f;
float goalCosRotation = 1.0f;
float goalSinRotation = 0.0f;
float goalCameraDistance = 20.0f;
float explosionValue = goalExplosionValue;
float cosRotation = goalCosRotation;
float sinRotation = goalSinRotation;
float cameraDistance = goalCameraDistance;
float previousHandDistance = -1.0f;
float previousTime = 0.0f;
float previousExplosionValue = explosionValue;
bool isInProgress = false;
auto leapEnterFrame = controller->enterFrame()->connect([&](input::leap::Controller::Ptr c)
{
if (!c->frame()->isValid())
return;
const float currentTime = (clock() - START_CLOCK) / float(CLOCKS_PER_SEC);
const float deltaTime = currentTime - previousTime;
previousTime = currentTime;
auto frame = c->frame();
auto leftHand = frame->leftmostHand();
auto rightHand = frame->rightmostHand();
float handDistance = 0.0f;
if (frame->numHands() >= 2)
{
if (leftHand->isValid() && rightHand->isValid())
handDistance = (leftHand->palmPosition() - rightHand->palmPosition())->length();
if (previousHandDistance < 0.0f)
previousHandDistance = handDistance;
const float deltaHandDistance = fabsf(handDistance - previousHandDistance);
if (deltaHandDistance > MIN_DELTA_HAND_DISTANCE)
{
const float moveIncr = handDistance < previousHandDistance ? -10.0f : 10.0f;
relativeMove += moveIncr * deltaTime;
}
previousHandDistance = handDistance;
const float moveDecr = relativeMove > 0.0f ? 0.5f : -0.5f;
relativeMove -= moveDecr * deltaTime;
if (!isInProgress)
{
if (relativeMove > RELATIVE_MOVE_THRESHOLD)
{
isInProgress = true;
goalExplosionValue = 3.5f;
relativeMove = 0.0f;
#ifdef DEBUG
std::cout << "spread mesh" << std::endl;
#endif // DEBUG
}
else if (relativeMove < -RELATIVE_MOVE_THRESHOLD)
{
isInProgress = true;
goalExplosionValue = 1.0f;
relativeMove = 0.0f;
#ifdef DEBUG
std::cout << "restore mesh" << std::endl;
#endif // DEBUG
}
}
}
else
{
// consider only the swipe gesture whose direction exhibits the strongest magnitude
const uint numGestures = frame->numGestures();
Vector3::Ptr swipeDirection = Vector3::create();
Vector3::Ptr bestSwipeDirection = Vector3::create();
for (uint i = 0; i < numGestures; ++i)
{
auto gesture = frame->gestureByIndex(i);
if (gesture->type() == input::leap::Gesture::Type::Swipe &&
gesture->state() == input::leap::Gesture::State::Start)
{
gesture->toSwipeGesture()->direction(swipeDirection);
if (swipeDirection->lengthSquared() > bestSwipeDirection->lengthSquared())
bestSwipeDirection->copyFrom(swipeDirection);
}
}
#ifdef DEBUG
if (bestSwipeDirection->lengthSquared() > 0.1f)
std::cout << "starting swipe direction = " << bestSwipeDirection->toString() << std::endl;
#endif // DEBUG
if (!isInProgress && bestSwipeDirection->lengthSquared() > 0.1f)
{
if (fabsf(swipeDirection->y()) > 0.5f)
{
isInProgress = true;
goalCameraDistance = swipeDirection->y() < 0.0f ? 10.0f : 20.0f;
#ifdef DEBUG
std::cout << "\t-> zoom in/out\tgoal camera distance = " << goalCameraDistance << std::endl;
#endif // DEBUG
}
else if (fabsf(swipeDirection->x()) > 0.5f)
{
const float goalRotation = atan2f(goalSinRotation, goalCosRotation) +
(swipeDirection->x() < 0.0f ? float(M_PI) * 0.25f : - float(M_PI) * 0.25f);
isInProgress = true;
goalCosRotation = cosf(goalRotation);
goalSinRotation = sinf(goalRotation);
#ifdef DEBUG
std::cout << "\t-> new rotation angle = " << 180.0f * goalRotation / float(M_PI) << std::endl;
#endif // DEBUG
}
}
}
const float diffExplosionValue = goalExplosionValue - explosionValue;
const float diffCameraDistance = goalCameraDistance - cameraDistance;
const float diffCosRotation = goalCosRotation - cosRotation;
const float diffSinRotation = goalSinRotation - sinRotation;
if (fabsf(diffExplosionValue) < 0.01f &&
fabsf(diffCameraDistance) < 0.01f &&
fabsf(diffCosRotation) < 0.01f &&
fabsf(diffSinRotation) < 0.01f)
{
#ifdef DEBUG
if (isInProgress)
std::cout << "current motion ended" << std::endl;
#endif // DEBUG
explosionValue = goalExplosionValue;
cameraDistance = goalCameraDistance;
cosRotation = goalCosRotation;
sinRotation = goalSinRotation;
isInProgress = false;
}
explosionValue += diffExplosionValue * std::min(1.0f, 2.0f * deltaTime);
cameraDistance += diffCameraDistance * std::min(1.0f, 2.5f * deltaTime);
cosRotation += diffCosRotation * std::min(1.0f, 3.0f * deltaTime);
sinRotation += diffSinRotation * std::min(1.0f, 3.0f * deltaTime);
explodeModel(
explosionValue,
previousExplosionValue,
sceneNode
);
previousExplosionValue = explosionValue;
placeCamera(
cameraDistance,
atan2f(sinRotation, cosRotation),
cameraNode->component<Transform>()->matrix()
);
});
// on initialization of the Leap controller
auto leapConnected = controller->connected()->connect([](input::leap::Controller::Ptr c)
{
c->enableGesture(input::leap::Gesture::Type::ScreenTap);
c->enableGesture(input::leap::Gesture::Type::Swipe);
#ifdef DEBUG
std::cout << "Leap controller connected (screentap and swipe gestures enabled)" << std::endl;
#endif // DEBUG
std::cout << "Leap controls\n-------------" << std::endl;
std::cout << "\t- Single hand controls\n\t\t- Horizontal swipe\tturn camera\n\t\t- Vertical swipe\tzoom in/out" << std::endl;
std::cout << "\t- Two hand controls\n\t\t- Brisk spreading motion\texplose model\n\t\t- Brisk shrinking motion\trestore model" << std::endl;
});
auto root = Node::create("root");
// setup assets
auto defaultMaterial = Material::create()
->set("diffuseColor", Vector4::create(1.f, 1.f, 1.f, 1.f))
->set("triangleCulling", render::TriangleCulling::NONE);
sceneManager->assets()->context()->errorsEnabled(true);
sceneManager->assets()->loader()->options()
->registerParser<file::PNGParser>("png")
->registerParser<file::SceneParser>("scene")
->generateMipmaps(false)
->material(std::static_pointer_cast<Material>(
Material::create()->set("triangleCulling", render::TriangleCulling::NONE)
))
->materialFunction([&](const std::string&, Material::Ptr)
{
return std::static_pointer_cast<Material>(defaultMaterial);
});
sceneManager->assets()
->geometry("cube", geometry::CubeGeometry::create(sceneManager->assets()->context()))
->geometry("sphere", geometry::SphereGeometry::create(sceneManager->assets()->context()))
->geometry("skybox", geometry::SphereGeometry::create(sceneManager->assets()->context(), 80, 80, true));
sceneManager->assets()->loader()
->queue(HANGAR_TEXTURE)
->queue("effect/Phong.effect")
->queue("effect/Basic.effect")
->queue(SCENE_NAME);
sceneManager->assets()->loader()->options()
->effect(sceneManager->assets()->effect("effect/Phong.effect"));
cameraNode
->addComponent(PerspectiveCamera::create(canvas->aspectRatio()))
->addComponent(Renderer::create(0x7F7F7FFF));
placeCamera(
cameraDistance,
atan2f(sinRotation, cosRotation),
cameraNode->component<Transform>()->matrix()
);
auto dirLight = Node::create("dirLight")
->addComponent(component::DirectionalLight::create())
->addComponent(component::Transform::create(
Matrix4x4::create()->lookAt(Vector3::zero(), Vector3::create(-1.0f, -1.0f, -1.0f))
));
auto pointLight = Node::create("pointLight")
->addComponent(component::PointLight::create())
->addComponent(component::Transform::create(
Matrix4x4::create()->appendTranslation(0.0f, 10.0f, 0.0f)
));
pointLight->component<PointLight>()->color()->setTo(1.0f, 1.0f, 1.0f);
auto skybox = Node::create("skybox")
->addComponent(Transform::create(
Matrix4x4::create()->appendScale(60.0f, 60.0f, 60.0f)
));
root
->addChild(cameraNode)
->addChild(dirLight)
->addChild(pointLight)
->addComponent(sceneManager);
auto _ = sceneManager->assets()->loader()->complete()->connect([=](file::Loader::Ptr loader)
{
sceneNode->addChild(sceneManager->assets()->symbol(SCENE_NAME));
skybox->addComponent(Surface::create(
sceneManager->assets()->geometry("skybox"),
BasicMaterial::create()
->diffuseColor(Vector4::create(1.0f, 0.0f, 0.0f, 1.0f))
->diffuseMap(sceneManager->assets()->texture(HANGAR_TEXTURE))
->triangleCulling(render::TriangleCulling::FRONT),
sceneManager->assets()->effect("effect/Basic.effect")
));
root
->addChild(dirLight)
->addChild(pointLight)
->addChild(skybox)
->addChild(cameraNode)
->addChild(sceneNode);
});
auto resized = canvas->resized()->connect([&](AbstractCanvas::Ptr canvas, uint w, uint h)
{
cameraNode->component<PerspectiveCamera>()->aspectRatio(float(w) / float(h));
});
auto enterFrame = canvas->enterFrame()->connect([&](Canvas::Ptr canvas, float time, float deltaTime)
{
sceneManager->nextFrame(time, deltaTime);
});
controller->start();
sceneManager->assets()->loader()->load();
canvas->run();
}
Geometry::Ptr
Geometry::computeTangentSpace(bool doNormals)
{
const unsigned int numVertices = this->numVertices();
if (numVertices == 0)
return shared_from_this();
if (!_data->hasProperty("position")
|| !_data->hasProperty("uv"))
throw std::logic_error("Computation of tangent space requires positions and uv.");
if (doNormals)
computeNormals();
const std::vector<unsigned short>& indices (this->indices()->data());
const unsigned int numFaces = indices.size() / 3;
unsigned short vertexIds[3] = { 0, 0, 0 };
std::vector<Vector3::Ptr> xyz(3);
std::vector<Vector2::Ptr> uv(3);
VertexBuffer::Ptr xyzBuffer = _data->get<VertexBuffer::Ptr>("position");
const unsigned int xyzSize = xyzBuffer->vertexSize();
const unsigned int xyzOffset = std::get<2>(*xyzBuffer->attribute("position"));
const std::vector<float>& xyzData = xyzBuffer->data();
VertexBuffer::Ptr uvBuffer = _data->get<VertexBuffer::Ptr>("uv");
const unsigned int uvSize = uvBuffer->vertexSize();
const unsigned int uvOffset = std::get<2>(*uvBuffer->attribute("uv"));
const std::vector<float>& uvData = uvBuffer->data();
std::vector<float> tangentsData(3 * numVertices, 0.0f);
for (unsigned int i = 0, offset = 0; i < numFaces; ++i)
{
for (unsigned int k = 0; k < 3; ++k)
{
vertexIds[k] = indices[offset++];
unsigned int index = xyzOffset + vertexIds[k] * xyzSize;
xyz[k] = Vector3::create(xyzData[index], xyzData[index + 1], xyzData[index + 2]);
index = uvOffset + vertexIds[k] * uvSize;
uv[k] = Vector2::create(uvData[index], uvData[index + 1]);
}
Vector2::Ptr uv02 = uv[0] - uv[2];
Vector2::Ptr uv12 = uv[1] - uv[2];
const float denom = uv02->x() * uv12->y() - uv12->x() * uv02->y();
const float invDenom = fabsf(denom) > 1e-6f ? 1.0f/denom : 1.0f;
Vector3::Ptr faceTangent = ((xyz[0]-xyz[2]) * uv12->y() - (xyz[1]-xyz[2]) * uv02->y()) * invDenom;
for (unsigned int k=0; k<3; ++k)
{
const unsigned int index = 3 * vertexIds[k];
tangentsData[index] += faceTangent->x();
tangentsData[index + 1] += faceTangent->y();
tangentsData[index + 2] += faceTangent->z();
}
}
for (unsigned int i = 0, index = 0; i < numVertices; ++i, index += 3)
{
const float x = tangentsData[index];
const float y = tangentsData[index + 1];
const float z = tangentsData[index + 2];
const float lengthSquared = x * x + y * y + z * z;
const float invLength = lengthSquared > 1e-6f ? 1.0f / sqrtf(lengthSquared) : 1.0f;
tangentsData[index] *= invLength;
tangentsData[index + 1] *= invLength;
tangentsData[index + 2] *= invLength;
}
VertexBuffer::Ptr tangentsBuffer = VertexBuffer::create(xyzBuffer->context(), tangentsData);
tangentsBuffer->addAttribute("tangent", 3, 0);
addVertexBuffer(tangentsBuffer);
return shared_from_this();
}
Geometry::Ptr
Geometry::computeNormals()
{
const unsigned int numVertices = this->numVertices();
if (numVertices == 0)
return shared_from_this();
if (_data->hasProperty("normal"))
throw std::logic_error("The geometry already stores precomputed normals.");
if (!_data->hasProperty("position"))
throw std::logic_error("Computation of normals requires positions.");
const std::vector<unsigned short>& indices = this->indices()->data();
const unsigned int numFaces = indices.size() / 3;
unsigned short vertexIds[3] = { 0, 0, 0 };
std::vector<Vector3::Ptr> xyz(3);
VertexBuffer::Ptr xyzBuffer = _data->get<VertexBuffer::Ptr>("position");
const unsigned int xyzSize = xyzBuffer->vertexSize();
const unsigned int xyzOffset = std::get<2>(*xyzBuffer->attribute("position"));
const std::vector<float>& xyzData = xyzBuffer->data();
std::vector<float> normalsData(3 * numVertices, 0.0f);
for (unsigned int i = 0, offset = 0; i < numFaces; ++i)
{
for (unsigned int k = 0; k < 3; ++k)
{
vertexIds[k] = indices[offset++];
const unsigned int index = xyzOffset + vertexIds[k] * xyzSize;
xyz[k] = Vector3::create(xyzData[index], xyzData[index + 1], xyzData[index + 2]);
}
Vector3::Ptr faceNormal = Vector3::create()
->copyFrom(xyz[0] - xyz[1])
->cross(xyz[0] - xyz[2]);
for (unsigned int k = 0; k < 3; ++k)
{
const unsigned int index = 3 * vertexIds[k];
normalsData[index] += faceNormal->x();
normalsData[index + 1] += faceNormal->y();
normalsData[index + 2] += faceNormal->z();
}
}
for (unsigned int i = 0, index = 0; i < numVertices; ++i, index += 3)
{
const float x = normalsData[index];
const float y = normalsData[index + 1];
const float z = normalsData[index + 2];
const float lengthSquared = x * x + y * y + z * z;
const float invLength = lengthSquared > 1e-6f ? 1.0f / sqrtf(lengthSquared) : 1.0f;
normalsData[index] *= invLength;
normalsData[index + 1] *= invLength;
normalsData[index + 2] *= invLength;
}
VertexBuffer::Ptr normalsBuffer = VertexBuffer::create(xyzBuffer->context(), normalsData);
normalsBuffer->addAttribute("normal", 3, 0);
addVertexBuffer(normalsBuffer);
return shared_from_this();
}
inline
void
copyTranslation(Vector3::Ptr t)
{
t->setTo(_m[3], _m[7], _m[11]);
}
void
bullet::PhysicsWorld::setGravity(Vector3::Ptr gravity)
{
_bulletDynamicsWorld->setGravity(btVector3(gravity->x(), gravity->y(), gravity->z()));
}
