Gui::Camera Class Reference

#include <View3DPy.h>

Public Types
enum	Orientation {   Top , Bottom , Front , Rear ,   Left , Right , Isometric , Dimetric ,   Trimetric }

Static Public Member Functions
static SbRotation	rotation (Orientation view)
	Formulas to get quaternion for axonometric views: More...

Member Enumeration Documentation

Orientation

enum Gui::Camera::Orientation

Enumerator
Top
Bottom
Front
Rear
Left
Right
Isometric
Dimetric
Trimetric

Member Function Documentation

rotation()

SbRotation Camera::rotation ( Camera::Orientation  view )

static

Formulas to get quaternion for axonometric views:

from math import sqrt, degrees, asin, atan
p1=App.Rotation(App.Vector(1,0,0),90)
p2=App.Rotation(App.Vector(0,0,1),alpha)
p3=App.Rotation(p2.multVec(App.Vector(1,0,0)),beta)
p4=p3.multiply(p2).multiply(p1)
 
from pivy import coin
c=Gui.ActiveDocument.ActiveView.getCameraNode()
c.orientation.setValue(*p4.Q)

The angles alpha and beta depend on the type of axonometry Isometric:

alpha=45
beta=degrees(asin(-sqrt(1.0/3.0)))

Dimetric:

alpha=degrees(asin(sqrt(1.0/8.0)))
beta=degrees(-asin(1.0/3.0))

Trimetric:

alpha=30.0
beta=-35.0

Verification code that the axonomtries are correct:

from pivy import coin
c=Gui.ActiveDocument.ActiveView.getCameraNode()
vo=App.Vector(c.getViewVolume().getMatrix().multVecMatrix(coin.SbVec3f(0,0,0)).getValue())
vx=App.Vector(c.getViewVolume().getMatrix().multVecMatrix(coin.SbVec3f(10,0,0)).getValue())
vy=App.Vector(c.getViewVolume().getMatrix().multVecMatrix(coin.SbVec3f(0,10,0)).getValue())
vz=App.Vector(c.getViewVolume().getMatrix().multVecMatrix(coin.SbVec3f(0,0,10)).getValue())
(vx-vo).Length
(vy-vo).Length
(vz-vo).Length
 
# Projection
vo.z=0
vx.z=0
vy.z=0
vz.z=0
 
(vx-vo).Length
(vy-vo).Length
(vz-vo).Length

See also: http://www.mathematik.uni-marburg.de/~thormae/lectures/graphics1/graphics_6_2_ger_web.html#1 http://www.mathematik.uni-marburg.de/~thormae/lectures/graphics1/code_v2/Axonometric/qt/Axonometric.cpp https://de.wikipedia.org/wiki/Arkussinus_und_Arkuskosinus

References Bottom, Dimetric, Front, Isometric, Left, Rear, Right, Top, and Trimetric.

Referenced by femtaskpanels.task_element_rotation1D._TaskPanel::accept(), Gui::AbstractSplitView::onMsg(), Gui::View3DInventor::onMsg(), femtaskpanels.task_element_rotation1D._TaskPanel::rotation_changed(), Gui::View3DInventorPy::viewBottom(), Gui::View3DInventorPy::viewDefaultOrientation(), Gui::View3DInventorPy::viewDimetric(), Gui::View3DInventorPy::viewFront(), Gui::View3DInventorPy::viewIsometric(), Gui::View3DInventorPy::viewLeft(), Gui::View3DInventorPy::viewRear(), Gui::View3DInventorPy::viewRight(), Gui::View3DInventorPy::viewTop(), and Gui::View3DInventorPy::viewTrimetric().

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The documentation for this class was generated from the following files:

• FreeCAD/src/Gui/View3DPy.h
• FreeCAD/src/Gui/View3DPy.cpp