//-------------------------------------------------------------------
void ICamera::PickRay(const vector2f& secen, Rayf& out)
{
//if( m_isChange )
//{
// Update();
//}
//http://stackoverflow.com/questions/2093096/implementing-ray-picking
//First you need to determine where on the nearplane the mouse click happened:
//
//rescale the window coordinates (0..640,0..480) to [-1,1], with (-1,-1) at the bottom-left corner and (1,1) at the top-right.
//'undo' the projection by multiplying the scaled coordinates by what I call the 'unview' matrix: unview = (P * M).inverse() = M.inverse() * P.inverse(), where M is the ModelView matrix and P is the projection matrix.
//Then determine where the camera is in worldspace, and draw a ray starting at the camera and passing through the point you found on the nearplane.
//
//The camera is at M.inverse().col(4), i.e. the final column of the inverse ModelView matrix.
//
//Final pseudocode:
//
//normalised_x = 2 * mouse_x / win_width - 1
//normalised_y = 1 - 2 * mouse_y / win_height
//// note the y pos is inverted, so +y is at the top of the screen
//
//unviewMat = (projectionMat * modelViewMat).inverse()
//
//near_point = unviewMat * Vec(normalised_x, normalised_y, 0, 1)
//camera_pos = ray_origin = modelViewMat.inverse().col(4)
//ray_dir = near_point - camera_pos
//vector4f ray(secen.m_x, secen.m_y , 1.0 , 1.0 );
////ray *= (*m_pUnProject);//这两部等效于ray *= ( (*m_pUnProject) * (*m_pUnView) );
////ray *= (*m_pUnView);
//ray *= m_UnViewProject;
//ray /= ray.m_w;
////vector4f camera(m_pUnView->a41,m_pUnView->a42,m_pUnView->a43,m_pUnView->a44);
////camera /= camera->m_w;
////ray -= camera;
//ray -= vector4f( m_Position );
//vector3f reslut(ray.m_x, ray.m_y, ray.m_z);
//reslut.NormalizeSelf();
//out.m_RayOrig = m_Position;
//out.m_RayDir = reslut;
vector4f rayb(secen.m_x, secen.m_y , 0.0 , 1.0 );//理论上z这个值应该是0，但是这样算出来的Y值偏小和aabb射线拾取不统一，故该做-1，只放大初始位置
vector4f raye(secen.m_x, secen.m_y , 1.0 , 1.0 );
vector4f ray2;
rayb *= GetUnViewProj();
ASSERT( 0 != rayb.m_w );
rayb /= rayb.m_w;
raye *= GetUnViewProj();
ASSERT( 0 != raye.m_w );
raye /= raye.m_w;
ray2 = raye - rayb;
vector3f reslut2(ray2.m_x, ray2.m_y, ray2.m_z);
reslut2.NormalizeSelf();
out.SetRayOrigin( vector3f(rayb) );
out.SetRayDirection( reslut2 );
}
void Entity::pick(const Rayf& ray, PickResult& pickResults) {
float dist = bounds().intersectWithRay(ray, NULL);
if (Math<float>::isnan(dist))
return;
Vec3f hitPoint = ray.pointAtDistance(dist);
EntityHit* hit = new EntityHit(*this, hitPoint, dist);
pickResults.add(hit);
}
Vec3f Grid::moveDeltaForBounds(const Model::Face& face, const BBoxf& bounds, const BBoxf& worldBounds, const Rayf& ray, const Vec3f& position) const {
const Planef dragPlane = Planef::alignedOrthogonalDragPlane(position, face.boundary().normal);
const Vec3f halfSize = bounds.size() * 0.5f;
float offsetLength = halfSize.dot(dragPlane.normal);
if (offsetLength < 0.0f)
offsetLength *= -1.0f;
const Vec3f offset = dragPlane.normal * offsetLength;
const float dist = dragPlane.intersectWithRay(ray);
const Vec3f newPos = ray.pointAtDistance(dist);
Vec3f delta = moveDeltaForPoint(bounds.center(), worldBounds, newPos - (bounds.center() - offset));
Axis::Type a = dragPlane.normal.firstComponent();
if (dragPlane.normal[a] > 0.0f) delta[a] = position[a] - bounds.min[a];
else delta[a] = position[a] - bounds.max[a];
return delta;
}
void Brush::pick(const Rayf& ray, PickResult& pickResults) {
float dist = bounds().intersectWithRay(ray, NULL);
if (Math<float>::isnan(dist))
return;
dist = Math<float>::nan();
Side* side = NULL;
for (unsigned int i = 0; i < m_geometry->sides.size() && Math<float>::isnan(dist); i++) {
side = m_geometry->sides[i];
dist = side->intersectWithRay(ray);
}
if (!Math<float>::isnan(dist)) {
assert(side != NULL);
Vec3f hitPoint = ray.pointAtDistance(dist);
FaceHit* hit = new FaceHit(*(side->face), hitPoint, dist);
pickResults.add(hit);
}
}
//------------------------------------------------------------------------------
//!
bool
BIH::trace( const Rayf& ray, Hit& hit, IntersectFunc intersect, void* data ) const
{
DBG_BLOCK( os_bih_trace, "BIH::trace(" << ray.origin() << ray.direction() << " hit: t=" << hit._t << " id=" << hit._id << ")" );
if( _nodes.empty() )
{
return false;
}
Vec3f invDir = ray.direction().getInversed();
// Compute traversal order.
uint order[3];
order[0] = invDir(0) >= 0.0f ? 0 : 1;
order[1] = invDir(1) >= 0.0f ? 0 : 1;
order[2] = invDir(2) >= 0.0f ? 0 : 1;
float tmin = 0.0f;
float tmax = hit._t;
bool impact = false;
// Traverse tree.
Vector<TraversalStackNode> stack( _maxDepth );
uint stackID = 0;
const Node* node = &_nodes[0];
while( 1 )
{
DBG_MSG( os_bih_trace, "Visiting " << *node );
if( node->isInteriorNode() )
{
uint axis = node->axis();
float tplane0 = ( node->_plane[order[axis]] - ray.origin()(axis)) * invDir(axis);
float tplane1 = ( node->_plane[1-order[axis]] - ray.origin()(axis)) * invDir(axis);
// Clip node.
if( node->isClipNode() )
{
// FIXME: we could probably do better (not traversing this node).
node = &_nodes[node->index()];
tmin = CGM::max( tmin, tplane0 );
tmax = CGM::min( tmax, tplane1 );
continue;
}
bool traverse0 = tmin < tplane0;
bool traverse1 = tmax > tplane1;
if( traverse0 )
{
if( traverse1 )
{
stack[stackID++].set(
&_nodes[node->index() + 1-order[axis]],
CGM::max( tmin, tplane1 ),
tmax
);
}
node = &_nodes[node->index() + order[axis]];
tmax = CGM::min( tmax, tplane0 );
}
else
{
if( traverse1 )
{
node = &_nodes[node->index() + 1-order[axis]];
tmin = CGM::max( tmin, tplane1 );
}
else
{
// Unstack.
do
{
if( stackID == 0 )
{
return impact;
}
stack[--stackID].get( node, tmin, tmax );
tmax = CGM::min( tmax, hit._t );
} while( tmin > tmax );
}
}
}
else
{
// We are in a leaf node.
// Intersects all primitives in it.
uint numElems = node->_numElements;
uint id = node->index();
for( uint i = 0; i < numElems; ++i, ++id )
{
if( intersect( ray, _ids[id], hit._t, data ) )
{
impact = true;
hit._id = _ids[id];
}
}
// Unstack.
do
{
if( stackID == 0 )
{
return impact;
}
stack[--stackID].get( node, tmin, tmax );
tmax = CGM::min( tmax, hit._t );
} while( tmin > tmax );
}
}
}
//------------------------------------------------------------------------------------------------------
SelectableRotatingRing::Selected SelectableRotatingRing::IsSelected( const Rayf& r )
{
aabbox3df local = m_BindBox;
local.SetCenter( GetWorldPosition() );
m_XBind.SetCenter( GetWorldPosition() );
m_YBind.SetCenter( GetWorldPosition() );
m_ZBind.SetCenter( GetWorldPosition() );
if ( ( local ).Intersection( r ) )
{
std::map< float, SelectableRotatingRing::Selected > rm;
vector3f point;
if(( m_XBind ).IntersectPointWithRay( r, point ) ) rm.insert( std::make_pair( (point - r.GetRayOrigin()).LengthPow(), SR_BY_X_AXIS ) );
if(( m_YBind ).IntersectPointWithRay( r, point ) ) rm.insert( std::make_pair( (point - r.GetRayOrigin()).LengthPow(), SR_BY_Y_AXIS ) );
if(( m_ZBind ).IntersectPointWithRay( r, point ) ) rm.insert( std::make_pair( (point - r.GetRayOrigin()).LengthPow(), SR_BY_Z_AXIS ) );
if ( rm.empty() )
{
return SR_NON;
}
return rm.begin()->second;
}
return SR_NON;
}
