[Flightgear-devel] Question: using <params> in 3d model?

[Torsten D. <to...@t3...>]

Hi all,

can I use the <params> tag in 3d-Instruments?

Background:
For a piston-twin, I want to add two RPM gauges to the 3d-panel but I do not 
want to create a separate 3d model for the LH and RH gauge but tell the model 
which property drives the needle. 
In 2d panels, this is done by the <params> tag.  Using the same technique in 
the 3d model does not seem to work. 
Here is what I am doing (this shows the rpm of engine[0], not engine[1]):

In the myaircraft.xml:
   <model>
        <name>RPM-Right</name>
        <path>Aircraft/SenecaII/Models/RPM.xml</path>
        <!-- does not seem to have any effect ;-( -->
        <params>
            <value0>/engines/engine[1]/rpm</value0>
        </params>
        <offsets>
            <x-m>-1.91</x-m>
            <y-m>-0.0876063</y-m>
            <z-m>1.28695</z-m>
        </offsets>
    </model>

in the RPM.xml:
<PropertyList>
    <path>RPM.ac</path>
    <params>
        <value0>/engines/engine[0]/rpm</value0>
    </params>
    <animation>
        <type>rotate</type>
        <object-name>Pointer</object-name>
        <property alias="../../params/value0"/>
        <offset-deg>152.0</offset-deg>
        <factor>-.08</factor>
        <center>
            <x-m>0.0</x-m>
            <y-m>0.0</y-m>
            <z-m>0.0</z-m>
        </center>
        <axis>
            <x>1</x>
            <y>0</y>
            <z>0</z>
        </axis>
    </animation>
</PropertyList>

Any Ideas?
Thanks, Torsten