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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Img3D/View/Camera.cpp
//! @brief Implements class Camera.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#include "Img3D/View/Camera.h"
namespace Img3D {
Camera::Camera()
: pos({0, 0, 1}, {0, 0, 0}, {1, 0, 0})
, pos3DAxes({0, 0, 1}, {0, 0, 0}, {1, 0, 0})
, zoom(1)
, vertAngle(60)
, nearPlane(1)
, farPlane(10000)
, lightPos1(500.f, 1000.f, 1000.f)
, lightPosRotated1(lightPos1)
{
setAspectRatio(1);
}
void Camera::lookAt(const CameraParams& pos_)
{
pos = pos_;
// lightPos = pos.eye;
set();
}
void Camera::lookAt3DAxes(const CameraParams& pos3DAxes_)
{
pos3DAxes = pos3DAxes_;
set();
}
// recalculate dependent params
void Camera::set()
{
// For 3D object
m_mat_model.setToIdentity();
m_mat_model.lookAt((pos.eye - pos.ctr) * zoom + pos.ctr, pos.ctr, pos.up);
QQuaternion rt(pos.rot * addRot);
m_mat_model.translate(pos.ctr);
m_mat_model.rotate(rt);
m_mat_model.translate(-pos.ctr);
// For 3D axes
m_mat_model3DAxes.setToIdentity(); //
m_mat_model3DAxes.lookAt((pos3DAxes.eye - pos3DAxes.ctr) + pos3DAxes.ctr, pos3DAxes.ctr,
pos3DAxes.up); //
QQuaternion rt3DAxes(pos3DAxes.rot * addRot);
m_mat_model3DAxes.rotate(rt3DAxes);
lightPosRotated1 = rt.inverted().rotatedVector(lightPos1);
emit updated(*this);
}
void Camera::setAspectRatio(float ratio)
{
m_mat_proj.setToIdentity();
m_mat_proj.perspective(vertAngle, ratio, nearPlane, farPlane);
}
void Camera::zoomBy(float zoom_)
{
zoom = zoom_;
set();
}
void Camera::endTransform(bool keep)
{
if (keep) {
pos.rot = (pos.rot * addRot).normalized();
pos.eye = pos.eye * zoom; // TODO limit
pos3DAxes.rot = (pos3DAxes.rot * addRot).normalized(); // no zooming for 3D axes
}
addRot = {};
zoom = 1;
set();
}
void Camera::horizontalTurn(float theta)
{
const CameraParams initial_pos3DAxes = getPos3DAxes();
const F3 v_eye3DAxes = initial_pos3DAxes.eye; // camera's position vector
const F3 v_ctr3DAxes = initial_pos3DAxes.ctr;
const F3 v_up3DAxes = initial_pos3DAxes.up;
const F3 v_axis3DAxes = v_up3DAxes.normalized(); // normalized rotation axis
// Rotating camera's position (eye) about up vector
const F3 v_rot_eye3DAxes =
v_up3DAxes * (1 - std::cos(theta)) * F3::dotProduct(v_axis3DAxes, v_eye3DAxes)
+ v_eye3DAxes * std::cos(theta)
+ F3::crossProduct(v_axis3DAxes, v_eye3DAxes) * std::sin(theta);
const CameraParams rotated_pos3DAxes(v_rot_eye3DAxes, v_ctr3DAxes, v_up3DAxes);
lookAt3DAxes(rotated_pos3DAxes);
// Horizontal camera turn for 3D object
const CameraParams initial_pos = getPos();
const F3 v_eye = initial_pos.eye; // camera's position vector
const F3 v_ctr = initial_pos.ctr;
const F3 v_up = initial_pos.up;
const F3 v_axis = v_up.normalized(); // normalized rotation axis
// Rotating camera's position (eye) about up vector
const F3 v_rot_eye = v_up * (1 - std::cos(theta)) * F3::dotProduct(v_axis, v_eye)
+ v_eye * std::cos(theta)
+ F3::crossProduct(v_axis, v_eye) * std::sin(theta);
const CameraParams rotated_pos(v_rot_eye, v_ctr, v_up);
lookAt(rotated_pos);
endTransform(true);
}
void Camera::verticalTurn(float theta)
{
const CameraParams initial_pos3DAxes = getPos3DAxes();
const F3 v_eye3DAxes = initial_pos3DAxes.eye; // camera's position vector
const F3 v_ctr3DAxes = initial_pos3DAxes.ctr;
const F3 v_up3DAxes = initial_pos3DAxes.up;
const F3 v_axis3DAxes =
F3::crossProduct(v_up3DAxes, v_eye3DAxes).normalized(); // normalized rotation axis
// Rotating camera's position (eye) about an axis perpendicular to up and eye vectors
const F3 v_rot_eye3DAxes =
v_up3DAxes * (1 - std::cos(theta)) * F3::dotProduct(v_axis3DAxes, v_eye3DAxes)
+ v_eye3DAxes * std::cos(theta)
+ F3::crossProduct(v_axis3DAxes, v_eye3DAxes) * std::sin(theta);
if (v_rot_eye3DAxes.y() * v_eye3DAxes.y() < 0) {
endTransform(true);
return;
}
const CameraParams rotated_pos3DAxes(v_rot_eye3DAxes, v_ctr3DAxes, v_up3DAxes);
lookAt3DAxes(rotated_pos3DAxes);
// Vertical camera turn for 3D object
const CameraParams initial_pos = getPos();
const F3 v_eye = initial_pos.eye; // camera's position vector
const F3 v_ctr = initial_pos.ctr;
const F3 v_up = initial_pos.up;
const F3 v_axis = F3::crossProduct(v_up, v_eye).normalized(); // normalized rotation axis
// Rotating camera's position (eye) about an axis perpendicular to up and eye vectors
const F3 v_rot_eye = v_up * (1 - std::cos(theta)) * F3::dotProduct(v_axis, v_eye)
+ v_eye * std::cos(theta)
+ F3::crossProduct(v_axis, v_eye) * std::sin(theta);
const CameraParams rotated_pos(v_rot_eye, v_ctr, v_up);
lookAt(rotated_pos);
endTransform(true);
}
} // namespace Img3D
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