Q: Cylinders in Inventor vs. Explorer...

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3 total messages Started by Dan Waylonis Tue, 12 Jan 1993 23:12

#104

Author: Dan Waylonis
Date: Tue, 12 Jan 1993 23:12

17 lines
1144 bytes

Hi,

In Explorer, a cylinder is defined by a beginning point, an ending point,
and a radius.

In Inventor, only the height and radius are specified.

How do I emulate the action of the Explorer function call via Inventor?
SoTransform with a translation and a rotation?

Thanks,
Dan
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Re: Q: Cylinders in Inventor vs. Explorer...

#137

Author: Alain Dumesny
Date: Tue, 26 Jan 1993 05:08

18 lines
1237 bytes

In article <1993Jan12.231214.24518@uc.msc.edu>, danw@uh.msc.edu (Dan Waylonis) writes:
|> Hi,
|> 
|> In Explorer, a cylinder is defined by a beginning point, an ending point,
|> and a radius.
|> 
|> In Inventor, only the height and radius are specified.
|> 
|> How do I emulate the action of the Explorer function call via Inventor?
|> SoTransform with a translation and a rotation?
|> 

Yes. The translation will be the midpoint (center of cylinder) and for the
rotation use SbRotation(fromVec, toVec) where fromVec = (0,1,0) and toVec =
ending - beginning point.

-------------------------------------------------------------------------
Alain Dumesny	alain@sgi.com	(415)390-5250	    Silicon Graphics Inc.

Re: Q: Cylinders in Inventor vs. Explorer...

#138

Author: Alain Dumesny
Date: Tue, 26 Jan 1993 05:19

35 lines
1961 bytes

In article <1993Jan15.011923.10776@uc.msc.edu>, danw@uh.msc.edu (Dan Waylonis) writes:
|> 
|> 
|> 	And one more question:  If my 'root' for the SceneGraph looks like:
|> 
|>                   SoSep
|>                   (root)
|>                     |
|>           __________|__________
|>           |                   |
|>         SoSep               SoSep
|>          (A)                 (B)
|>    _______|_______     _______|_______
|>    |    |   |    |     |    |   |    |
|>  Node  ... ... Node   Node ... ... Node
|> 
|> 	Is there a way to just "replace" the "A" or "B" separators without
|> 	having to reset the view (as in:  root->addChild(A), root->addChild(B),
|> 	SoXtExaminerViewer::setSceneGraph(root)) ?
|> 		

Sure. You can make any changes you want to the scene graph even after
giving it to the viewer. By default the viewer only insert a camera (if it
doesn't find one) and possibly other stuff outside of the scene graph root
that you supply, so your scene graph topology shouldn't change. When you
change the scene (say replace sepA with something else) a redraw will
later happen, but the camera will not change position.

|> 	BTW, Inventor is really cool.
|> 

Glad you like it....

-------------------------------------------------------------------------
Alain Dumesny	alain@sgi.com	(415)390-5250	    Silicon Graphics Inc.

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