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Re: Supose this... [message #54156 is a reply to message #54142]

Thu, 24 May 2007 16:20

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On May 24, 11:38 am, David Fanning <n...@dfanning.com> wrote:
> Folks,
>
> Alright, suppose this.
>
> Suppose I wanted to build a 3D transparent globe, with
> continental outlines, major cities, etc. displayed on it.
> And suppose I wanted to stick a sphere in the center of
> the globe with pointy bits sticking out of it. (Think of
> of those medieval weapons that the Visigoths swung from a chain to
> bash in the skulls of their enemies.) I'd like to see where the
> pointy bits stick out of the globe. (Please don't ask
> me why.)
>
> Would IDL be the software you would use to do this?
> Would I run into the "pimento problem" with the back
> side of the globe?

How about:

interiorSphere = obj_new('orb', radius=0.1, $
alpha_channel=0.5, $
color=[255, 0, 0])
globe = obj_new('orb', radius=0.2, $
alpha_channel=0.2, $
color=[0, 0, 255])

vertices1 = [[0, 0, 0], [0, 0, 0.1], [0.3, 0, 0]]
polygons1 = [3, 0, 1, 2]
spike1 = obj_new('idlgrpolygon', vertices1, $
polygons=polygons1, $
alpha_channel=0.5, $
color=[0, 255, 0])

vertices2 = [[0, 0, 0], [0, 0, 0.1], [0.212, 0.212, 0]]
polygons2 = [3, 0, 1, 2]
spike2 = obj_new('idlgrpolygon', vertices2, $
polygons=polygons2, $
alpha_channel=0.5, $
color=[0, 255, 0])

omodel = obj_new('idlgrmodel')
omodel->add, interiorSphere
omodel->add, spike1
omodel->add, spike2
omodel->add, globe
xobjview, omodel

I think if "globe" where the only transparent object it would be
pretty good.

By the way, I've been impressed with VTK. For something similar to
your problem, how about these two shots:

http://michaelgalloy.com/wp-content/uploads/2007/05/vtk-left .png
http://michaelgalloy.com/wp-content/uploads/2007/05/vtk-righ t.png

These are screenshots from an interactive trackball-type application
and I'm not doing any manual sorting of polygons. (Yes, POV-Ray is
awesome, but it takes me a while to everything setup just right and
it's definitely not interactive.)

Mike
--
michaelgalloy.com

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[Message index]

		Re: Supose this... By: KRDean on Fri, 25 May 2007 07:13
		Re: Supose this... By: Michael Galloy on Thu, 24 May 2007 16:20
		Re: Supose this... By: Rick Towler on Thu, 24 May 2007 15:34
		Re: Supose this... By: cgguido on Thu, 24 May 2007 14:58
		Re: Supose this... By: Vince Hradil on Thu, 24 May 2007 12:56
		Re: Supose this... By: cgguido on Thu, 24 May 2007 12:14
		Re: Supose this... By: warner.pete on Fri, 25 May 2007 12:09

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