Re: [Flightgear-devel] Aerodynamic centre and 3D models

[Russell Suter]

Jim Wilson wrote:

Russell Suter said:

 

I suspect these properties are applied anyway -- even if they are zero.  I
don't know if these are applied per frame or if they are applied once to
the model.  In the latter case, you can ride the toll road all day and only
have to pay the toll once!
   

Exactly.

From sgLoad3DModel (in SimGear/simgear/scene/model.cxx):
 ssgTransform * alignmainmodel = new ssgTransform;
 alignmainmodel->addKid(model);
 sgMat4 res_matrix;
 sgMakeOffsetsMatrix(&res_matrix,
                     props.getFloatValue("/offsets/heading-deg", 0.0),
                     props.getFloatValue("/offsets/roll-deg", 0.0),
                     props.getFloatValue("/offsets/pitch-deg", 0.0),
                     props.getFloatValue("/offsets/x-m", 0.0),
                     props.getFloatValue("/offsets/y-m", 0.0),
                     props.getFloatValue("/offsets/z-m", 0.0));
 alignmainmodel->setTransform(res_matrix);
 

So this happens only once, not per-frame, right?

--
Russ
Conway's Law: "The structure of a system tends to mirror the
structure of the group producing it."
     -- Mel Conway Datamation (1968)


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