TARGET_MARKERS Adding "Target" Symbols on Nodes
TARGET_MARKERS Adding target symbols on nodes
The figure (right) shows the control panel.
Target markers are used to mimic the actual markers that are attached to objects when being tested. This allows direct visual comparison between points on high-speed film and analytical results.
Because markers are attached to nodes they can only be defined in one model at a time. If multiple models are present you will be forced to choose the model in which to define the markers.
Markers are stored as a "per model" attribute, so if you have multiple windows in a model the markers will appear in all of its windows.
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The figure (right) shows an example of a dummy model with target markers applied. Markers are made up a circle with quadrants of alternating colours.
They are attached to nodes and are drawn only if their parent node
is visible.
They are always drawn in the current plane of the screen regardless of the true orientation of any underlying mesh.
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Marker Radius  If expressed in model space, the default, marker radius will be about 3% of the model overall dimension, and size will change as you zoom in and out. If expressed in screen space marker radius will be a fixed size, independent of the model dimensions, and will not scale as you zoom in or out. | |
Marker switch: Controlling display of target markersBy default this switch is on, and any markers that are defined will be drawn when the plot is next updated. To suppress the display of markers without having to delete their definitions turn this switch off. |
CREATE Creating target markers at nodes |
| This is very simple. Define a <list> of nodes using the standard range definition panels, and the next time the model is drawn (with the Marker switch on) target markers with the current attributes will be drawn on those nodes. |
DELETE Removing target markers from nodes |
| This is the exact opposite of above: define the <list> of nodes from which target markers are to be removed. It doesn't matter if a node is selected that does not currently have a marker attached. |
Radius Defining the symbol radius |
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A default radius for markers (in model space units) is computed based on the model's longest dimension: you can alter this at will. This takes effect the next time you update the plot. |
Setting quadrant colours The default colours for the marker symbol are yellow and blue, but you
can choose new colours for the two quadrants (
and
) from the standard palette given.
These take effect the next time you update the plot.
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Notes on target markers |
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| Note 1: | Target markers are always drawn in the plane of the screen, regardless of model orientation. On 3-D devices this results in the symbols being rotated as the image is rotated, and they can disappear when edge-on after a 90 degree rotation. To see them again you will have to issue an explicit redrawing command in the new orientation. |
| Note 2: | Hidden surface removal is based on the coordinates of the parent node only: markers are drawn in full if the node is visible, otherwise not at all. |