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Re: object graphics question [message #37869 is a reply to message #9709]

Wed, 04 February 2004 06:54

btt
Messages: 345
Registered: December 2000

Senior Member

Karsten Rodenacker wrote:
>
> I have a problem with coordinated transformations of IDLgrImage and
> other objects, e.g. IDLgrContour.
>
> Does anybody know why rotating behaves like it does?
> In the small example:
>
> img=read_png( filepath('mineral.png', SUBDIR=['examples','data']))
> m=obj_new('IDLgrModel')
> m->add,obj_new('IDLgrImage',img)
> m->add,obj_new('IDLgrContour',img,color=[255,0,0])
> xobjview,m,/block
>
> rotation shows a quite bizar behaviour.
>
> I would expect that the image moves like one level of the contour object.
>

Hi Karsten,

Yes, that is wierd... but there is a solution.

You should really be rendering a polygon with the image as a texture
map. IDLgrImage are always displayed at Z=0 (or some such place.) To
give the image a real coordinate system you have to attach it to some
spatial object, like a polygon or a surface.

img=read_png( filepath('mineral.png', SUBDIR=['examples','data']))
m=obj_new('IDLgrModel')
oimg = obj_new('IDLgrImage',img)
oimg -> GetProperty, dim = dim
poly = obj_new("IDLgrPolygon", [0,0,dim[0]-1, dim[0]-1], $
[0,dim[1]-1,dim[1]-1, 0], $
color = [255,255,255], $
Texture_Map = oImg,$
Texture_Coord = [[0,0],[0,1], [1,1], [1,0]])
m->add, poly
m->add,obj_new('IDLgrContour',img,color=[255,0,0])
xobjview,m,/block

Cheers,
Ben

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[Message index]

		Object graphics questions and comment By: Paul van Delst on Fri, 08 August 1997 00:00
		Re: object graphics question By: btt on Wed, 04 February 2004 06:54
		Re: object graphics question By: David Fanning on Wed, 04 February 2004 06:08
		Re: Object graphics questions By: Michael Wallace on Fri, 11 March 2005 16:54

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