void CameraController::focusOnBounds(const Imath::Box3f& bounds)
{
using namespace Imath;
V3f fwd = m_parameters->forwardUnitVector();
V3f center = bounds.center();
float distance = bounds.size().length() / (2.0f * tan(m_parameters->fovY() / 2));
m_parameters->setEyeTarget(center - fwd * distance, center);
}
void DotNodeGadget::updateLabel()
{
const Dot *dot = dotNode();
const Dot::LabelType labelType = (Dot::LabelType)dot->labelTypePlug()->getValue();
if( labelType == Dot::None )
{
m_label.clear();
}
else if( labelType == Dot::NodeName )
{
m_label = dot->getName();
}
else if( labelType == Dot::UpstreamNodeName )
{
const Node *n = upstreamNode();
m_label = n ? n->getName() : "";
}
else
{
m_label = dot->labelPlug()->getValue();
}
Edge labelEdge = RightEdge;
if( const Plug *p = dot->inPlug<Plug>() )
{
if( noduleTangent( nodule( p ) ).x != 0 )
{
labelEdge = TopEdge;
}
}
const Imath::Box3f thisBound = bound();
if( labelEdge == TopEdge )
{
const Imath::Box3f labelBound = style()->textBound( Style::LabelText, m_label );
m_labelPosition = V2f(
-labelBound.size().x / 2.0,
thisBound.max.y + 1.0
);
}
else
{
const Imath::Box3f characterBound = style()->characterBound( Style::LabelText );
m_labelPosition = V2f(
thisBound.max.x,
thisBound.center().y - characterBound.size().y / 2.0
);
}
requestRender();
}
bool rayPassesNearOrThrough(const V3d& rayOrigin, const V3d& rayDir) const
{
const double diagRadius = 1.2*bbox.size().length()/2; // Sphere diameter is length of box diagonal
const V3d o2c = bbox.center() - rayOrigin; // vector from rayOrigin to box center
const double l = o2c.length();
if(l < diagRadius)
return true; // rayOrigin lies within bounding sphere
// rayOrigin lies outside of bounding sphere
const double cosA = o2c.dot(rayDir)/l; // cosine of angle between rayDir and vector from origin to center
if(cosA < DBL_MIN)
return false; // rayDir points to side or behind with respect to direction from origin to center of box
const double sinA = sqrt(1 - cosA*cosA); // sine of angle between rayDir and vector from origin to center
return sinA/cosA < diagRadius/l;
}
void CameraController::frame( const Imath::Box3f &box, const Imath::V3f &viewDirection, const Imath::V3f &upVector )
{
// make a matrix to centre the camera on the box, with the appropriate view direction
M44f cameraMatrix = rotationMatrixWithUpDir( V3f( 0, 0, -1 ), viewDirection, upVector );
M44f translationMatrix;
translationMatrix.translate( box.center() );
cameraMatrix *= translationMatrix;
// translate the camera back until the box is completely visible
M44f inverseCameraMatrix = cameraMatrix.inverse();
Box3f cBox = transform( box, inverseCameraMatrix );
Box2f screenWindow = m_data->screenWindow->readable();
if( m_data->projection->readable()=="perspective" )
{
// perspective. leave the field of view and screen window as is and translate
// back till the box is wholly visible. this currently assumes the screen window
// is centred about the camera axis.
float z0 = cBox.size().x / screenWindow.size().x;
float z1 = cBox.size().y / screenWindow.size().y;
m_data->centreOfInterest = std::max( z0, z1 ) / tan( M_PI * m_data->fov->readable() / 360.0 ) + cBox.max.z +
m_data->clippingPlanes->readable()[0];
cameraMatrix.translate( V3f( 0.0f, 0.0f, m_data->centreOfInterest ) );
}
else
{
// orthographic. translate to front of box and set screen window
// to frame the box, maintaining the aspect ratio of the screen window.
m_data->centreOfInterest = cBox.max.z + m_data->clippingPlanes->readable()[0] + 0.1; // 0.1 is a fudge factor
cameraMatrix.translate( V3f( 0.0f, 0.0f, m_data->centreOfInterest ) );
float xScale = cBox.size().x / screenWindow.size().x;
float yScale = cBox.size().y / screenWindow.size().y;
float scale = std::max( xScale, yScale );
V2f newSize = screenWindow.size() * scale;
screenWindow.min.x = cBox.center().x - newSize.x / 2.0f;
screenWindow.min.y = cBox.center().y - newSize.y / 2.0f;
screenWindow.max.x = cBox.center().x + newSize.x / 2.0f;
screenWindow.max.y = cBox.center().y + newSize.y / 2.0f;
}
m_data->transform->matrix = cameraMatrix;
m_data->screenWindow->writable() = screenWindow;
}