/******************************************************************************
* Aligns the slicing plane to the viewing direction.
******************************************************************************/
void SliceModifierEditor::onAlignPlaneToView()
{
TimeInterval interval;
Viewport* vp = dataset()->viewportConfig()->activeViewport();
if(!vp) return;
// Get the object to world transformation for the currently selected object.
ObjectNode* node = dynamic_object_cast<ObjectNode>(dataset()->selection()->front());
if(!node) return;
const AffineTransformation& nodeTM = node->getWorldTransform(dataset()->animationSettings()->time(), interval);
// Get the base point of the current slicing plane in local coordinates.
SliceModifier* mod = static_object_cast<SliceModifier>(editObject());
if(!mod) return;
Plane3 oldPlaneLocal = mod->slicingPlane(dataset()->animationSettings()->time(), interval);
Point3 basePoint = Point3::Origin() + oldPlaneLocal.normal * oldPlaneLocal.dist;
// Get the orientation of the projection plane of the current viewport.
Vector3 dirWorld = -vp->cameraDirection();
Plane3 newPlaneLocal(basePoint, nodeTM.inverse() * dirWorld);
if(std::abs(newPlaneLocal.normal.x()) < FLOATTYPE_EPSILON) newPlaneLocal.normal.x() = 0;
if(std::abs(newPlaneLocal.normal.y()) < FLOATTYPE_EPSILON) newPlaneLocal.normal.y() = 0;
if(std::abs(newPlaneLocal.normal.z()) < FLOATTYPE_EPSILON) newPlaneLocal.normal.z() = 0;
undoableTransaction(tr("Align plane to view"), [mod, &newPlaneLocal]() {
mod->setNormal(newPlaneLocal.normal.normalized());
mod->setDistance(newPlaneLocal.dist);
});
}
/******************************************************************************
* Aligns the current viewing direction to the slicing plane.
******************************************************************************/
void SliceModifierEditor::onAlignViewToPlane()
{
TimeInterval interval;
Viewport* vp = dataset()->viewportConfig()->activeViewport();
if(!vp) return;
// Get the object to world transformation for the currently selected object.
ObjectNode* node = dynamic_object_cast<ObjectNode>(dataset()->selection()->front());
if(!node) return;
const AffineTransformation& nodeTM = node->getWorldTransform(dataset()->animationSettings()->time(), interval);
// Transform the current slicing plane to the world coordinate system.
SliceModifier* mod = static_object_cast<SliceModifier>(editObject());
if(!mod) return;
Plane3 planeLocal = mod->slicingPlane(dataset()->animationSettings()->time(), interval);
Plane3 planeWorld = nodeTM * planeLocal;
// Calculate the intersection point of the current viewing direction with the current slicing plane.
Ray3 viewportRay(vp->cameraPosition(), vp->cameraDirection());
FloatType t = planeWorld.intersectionT(viewportRay);
Point3 intersectionPoint;
if(t != FLOATTYPE_MAX)
intersectionPoint = viewportRay.point(t);
else
intersectionPoint = Point3::Origin() + nodeTM.translation();
if(vp->isPerspectiveProjection()) {
FloatType distance = (vp->cameraPosition() - intersectionPoint).length();
vp->setViewType(Viewport::VIEW_PERSPECTIVE);
vp->setCameraDirection(-planeWorld.normal);
vp->setCameraPosition(intersectionPoint + planeWorld.normal * distance);
}
else {
vp->setViewType(Viewport::VIEW_ORTHO);
vp->setCameraDirection(-planeWorld.normal);
}
vp->zoomToSelectionExtents();
}