Cessna blades rotation

[marco....@elmansrl.eu]

Hi, 

given the cessna model, I wanted to know if there is a possibility to hook the motor blade knot to make it spin ...

Anyway, if I had a model of a helicopter (.obj), what is the way to generate the spin effect?

Thanks

[Tony Vasile]

Normally you need a MatrixTransform node attach to the propeller geometry and apply the appropriate rotations to that. Obj only describes the geometry and the possibly the textures for model. Maybe the easiest thing to split the cessna geometry into the body of the plane and the propeller. Load both models and attach a MatrixTransfrom to the propeller. Next create an instance of a MatrixTransfrom and an instance of NodeCallback which updates the rotational position of the propeller every frame. It maybe tricky to align the propeller and the Cessna body after loading them. Just my 2 cents worth.

[marco....@elmansrl.eu]

Ok, I understand well.

But, is there a way to split by library the node into its components using some osg classes?

[Andreas Ekstrand]

Hi Marco,

Since there's only one Geometry in the Cessna model, you will need to split it manually in a modeling tool.

I recommend separating the propeller geometry into DOF nodes and saving as OpenFlight in Remo 3D...of course. :-) It's available as a fully functional 15-days evaluation version from our website.

Regards,
Andreas

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[Marco Maisano]

Thanks for fast reply,

ok for cessna...

But if I have a .obj file? Because I saw that for example using the PolytopeIntersector class I found all subnodes that compose the model, then is there a way to split the model's subnodes? 

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Marco Maisano

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[Tony Vasile]

The problem with an obj file is that is only geometry with an optional material file. As Andreas the easiest way to seperate the propellor is to load into something like Blender or Remograph and select the propeller geometry and split it. With Blender you would need to covert it to a format that Blender can import using osgconv.

You could use osgviewer to load the model after trimming some of the geometry off and with some trial and error you could split the appropriate geometry. 

[Tony Vasile]

To help you on you way I had a quick go with splitting the cessna.