Module: Ortho Slice (LDA) ()

Description:

The Ortho Slice (LDA) module is an important tool for visualizing scalar data fields defined on uniform Cartesian grids, e.g., 3D image volumes. Such data are visualized by extracting an arbitrary axis-aligned slice out of the volume. The data values can be mapped to colors or gray levels by following mapping method: an external colormap can be used in Ortho Slice (LDA).

The Ortho Slice (LDA) module is also capable of extracting slices of an RGBA color field or of a 3D multi-channel field. In these cases the slices are displayed as is and no mapping method need to be chosen.

Connections:

Data [required]
The 3D field to be visualized. Currently, regular scalar fields, multi-channel fields, and RGBA color fields with uniform or stacked coordinates are supported.

Colormap [optional]
Optional colormap used to map scalar data to colors. See also Colormap.

Ports:

Orientation

This port provides three buttons for resetting the slice orientation: xy perpendicular to the z-axis, xz perpendicular to the y-axis, or yz perpendicular to the x-axis.

Slice Number

This slider allows you to select different slices. The slices may also be picked with the mouse and dragged directly in the 3D viewer.

Interpolation

Controls whether interpolation is nearest or bilinear. Multi samples computes a weighted value from 12 neighbors.

Channels

This port is displayed if the module is attached to a 3D multi-channel object. It allows you to toggle individual channels on or off. Each channel is mapped using a linear intensity ramp. The data window for each channel can be adjusted in the multi-channel object itself.

Mapping Type

Mapping Type

The port is not available if the Ortho Slice (LDA) module is connected to an RGBA color field or to a 3D multi-channel field.

Colormap

Choose colormap if mapping type is set to Colormap.

Display Options

Options

If the adjust view toggle is set (unset by default), the camera of the selected viewer is reset each time a new slice orientation is selected. Equal resolution is false by default. When it is set, all ortho slices and oblique slices are drawn using the same resolution. When lighting is set (set by default), the display appears lit. When no color table is not set (default), when editing the colormap, the rendering speed is faster and the color interpolation is better. This option uses shaders so it may be very slow on old graphic boards. Please note also that adjust view is enabled by default when the module is the first planar module in the Project View.

Frame

This port is used to display or hide the frame and to set the frame color.

Transparency

This radio box port determines the transparency of the slice. None means that the slices are fully opaque. Binary means that only fully transparent parts are transparent while others are fully opaque when using colormap mapping. Alpha means that opacity is proportional to luminance. If a colormap is used for visualization, opacity values are taken from there.

Embossing

Embossing

Enables/disables embossing. This rendering technique (also known as "bump mapping") emphasizes gradient changes in the data on the slice. Note that this feature requires programmable shader support in the graphics hardware.

Embossing Factor

This port is displayed if embossing is enabled. Specifies the intensity of the embossing effect. Default value is 0 (no embossing). Values can be positive or negative. Note that this feature requires programmable shader support in the graphics hardware.

Commands:

createImage <image base name>
This command creates a 2D image and adds it to the Project View. The image base name can be omitted.