The controls for the levels
of detail used to enable interactive rendering of large data can be accessed
in the LOD Parameters area available on the General tab of the 3D View
Properties property sheet. For large data sets that may require several
seconds to render it is helpful to have a simplified version of the data
that can be manipulated interactively, with the full resolution data used
for generate an image once interaction is complete. ParaView will automatically
create the lower resolution representation of your data objects for you
to ensure interactivity. The LOD Parameters area
will appear similar to the example shown on the right. Using these controls
you can adjust the threshold at which an LOD model is created, and the
resolution of this LOD model. In addition, you can enable or disable rendering
interrupts. Each of these features is described below.
LOD threshold:
This slider can be used to control the threshold at which a lower resolution
representation of your data is created. For data sets that contain less
than the specified number of points, the original data will always be
used for rendering. Moving the slider to the left will increase the threshold
and will tend to render every data object at full resolution. Moving the
slider to the right will lower the threshold and will give you better
interactive performance by rendering lower resolution data.
LOD resolution:
When a lower resolution version of the data is created, a 3D grid is used
as part of a quadric clustering algorithm. This slider controls the resolution
of this grid. Moving the slider to the left will lead to better approximations,
while moving the slider to the right will produce coarser approximations
with better interactive performance.
Allow
rendering interrupts: When checked the rendering process in the
Display Area can be interrupted by a mouse click. If you are rendering
large data you may be able to interact with the data at a good rate due
to the lower resolution version of the data, but it may require several
seconds to refresh to the full resolution version when interaction is
complete (the mouse button is released). If this button is not checked,
then you must wait for the high resolution render to complete before further
interaction can occur. When this button is checked, you can click in the
Display Area to begin a new interaction, or click on the interface to
change the state of a widget, and the current render will be aborted to
respond. When MPI is in use, ParaView uses asynchronous messaging to provide
this functionality.
The controls for the levels
of detail used to enable interactive rendering of large data can be accessed
in the LOD Parameters area available on the General tab of the 3D View
Properties property sheet. For large data sets that may require several
seconds to render it is helpful to have a simplified version of the data
that can be manipulated interactively, with the full resolution data used
for generate an image once interaction is complete. ParaView will automatically
create the lower resolution representation of your data objects for you
to ensure interactivity. The LOD Parameters area
will appear similar to the example shown on the right. Using these controls
you can adjust the threshold at which an LOD model is created, and the
resolution of this LOD model. In addition, you can enable or disable rendering
interrupts. Each of these features is described below.