| Comments on CHRONO example placer_fourbar.r3d |
| Test 'placer' object |
| What to do: load the file and press the play button on the animation timeline (watch at least 3 seconds of simulation). While animation is running, you can modify the lengths of the bars thank to the 'placer' object. |
Normally, this mechanism works as a simple four-bar linkage.
Here, if you select the 'controls' object (up in the hierarchy), you can
open its 'panel', then you will see three sliders which you can use
to modify the lengths of the bars, interactively.
In pratice, the sliders modify -trought javascript- the 'distance' values
of three 'placer' objects. Such 'placer' objects simply move the COG of
their child objects (markers for referencing the revolute joints, in this example)
along a direction. Hence, they offer an easy way to
build parametric models.
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