3D View
All 3D Views in DG Kernel software, behave in the same way during view manipulations by end user:
To rotate the model use left mouse button.
To pan - hold shift key and use left mouse button.
To zoom - use right mouse button.
To zoom to a selected rectangle - press and release w key and
select a rectangle using the mouse (left button).
Making circles with mouse while holding left mouse button causes the model to rotate around axis orthogonal to the screen.
Further concepts
Viewing rotations and zoom are performed around (relative to) centre of the current Viewing Volume Briefly
speaking Viewing Volume is what is visible in 3D window.
Sometimes after a number of manipulations center of viewing volume
shifts far from the area on which the user is focused on. This is
especially important with high zoom or long models, when a small detail
has to be analyzed. In this situation viewing can become awkward because
even small rotations can quickly move the focus point out of the window.
To help with that it is recommended from time to time adjust near
and far extents of the
Viewing Volume (Depth
Range). Depth Range can be viewed and modified using:
DG Kernel 3D views have additional Depth
mode. A view works in Depth mode when z key is held down. Normal viewing
mode is restored automatically when the key is released.
Depth mode is used to view and adjust depth range of the current
Viewing Volume.
In depth mode point of view changes to one from bottom up relative to
the current orientation. Lets assume that the current orientation is
such that the global z axis is directed orthogonal to the screen towards
the viewer and y axis is directed up. Then in depth mode z axis will be
directed up and y axis will be directed orthogonal to the screen from
the viewer.
In depth mode rotation is disabled but pan and zoom are working as
normal.
In depth mode the current
Viewing Volume is displayed
as blue rectangle. Zoom out slightly to see the whole rectangle.
To modify the depth range click into the window and move the mouse in
vertical direction to select which part of the model should be included.
New depth range will be displayed with blue dashed rectangle.
This technique also allows to exclude from view objects or parts of
them in front or behind the focus point, or, in other words, to zoom in
in direction of depth.
See it in a video
3D Navigation
When very high zoom is required to view a tiny detail of the model
series of zoom, pan and depth zoom modifications are needed.
If you become disoriented use View>Reset All in 3D Debugger to
restore default view configuration. Programmatically the same can be
achieved with IView2.Reset
Use also View Points to store and return
to frequently used view configurations.
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