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Re: 3D point cloud visualization [message #90853 is a reply to message #90851]

Tue, 28 April 2015 19:55

Dick Jackson
Messages: 347
Registered: August 1998

Senior Member

Hi Nuno,

Sounds fascinating! I have time for only a quick reply now: If you're looking to
quickly visualize this, Object Graphics is pretty handy, and you have all the
data in exactly the right form!:

; Assumes 'rgba' is (4,N) byte array of RGBA values (0-255 for alpha as well)

o = Obj_New('IDLgrPolygon', v, Polygons=p, Vert_Colors=rgba, Style=2)
XObjView, o

You may want to look at other IDLgrPolygon Properties in Online Help, and
options to XObjView.

The IDL 8.0 "function graphics" routine POLYGON() is another possibility you
might try. Write back if you'd like to know more.

--

Cheers,
-Dick

Dick Jackson Software Consulting Inc.
Victoria, BC, Canada
www.d-jackson.com

Nuno Ferreira wrote on 2015-04-28 8:31am:
> Hi,
>
> I am trying to visualize a 3D point cloud that was captured with a Kinect
> camera. I have "v", a (3,N) array of the xyz coordinates of N vertices and
> "p", a (4,M) array of M polygons (all triangles). Each polygon contains the
> number of vertices (always 3) and indices to 3 vertices in array "v". For
> each vertex I also have the color, given as RGB components and alpha.
>
>
> I have two questions:
>
> 1 - I would like to use POLYSHADE with the SHADES keyword and the RGB
> information, but the manual says "When using the SHADES keyword on TrueColor
> devices, we recommend that decomposed color support be turned off by setting
> DECOMPOSED=0". However, using decomposed=0 limits the number of simultaneous
> colors to only 256... Isn't it possible to use the SHADES keyword with true
> color (RGB components)?
>
> 2 - I am also using PLOTS to draw all the vertices in 3D as dots, with a
> command such as:
>
> plots, v[0,*], v[1,*], v[2,*], color=quantized_colors_256, /T3D, psym=3
>
> How can I increase the size of the dots with PLOTS? Apparently keyword
> SYMSIZE does not serve this purpose...
>
> Any help would be greatly appreciated. Thanks,
>
> Nuno
>

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[Message index]

		3D point cloud visualization By: Nuno Ferreira on Tue, 28 April 2015 08:31
		Re: 3D point cloud visualization By: Jeremy Bailin on Tue, 28 April 2015 09:39
		Re: 3D point cloud visualization By: Dick Jackson on Tue, 28 April 2015 19:55
		Re: 3D point cloud visualization By: Jim Pendleton on Tue, 28 April 2015 21:13
		Re: 3D point cloud visualization By: Nuno Ferreira on Wed, 29 April 2015 09:18
		Re: 3D point cloud visualization By: Jim Pendleton on Wed, 29 April 2015 12:14
		Re: 3D point cloud visualization By: Nuno Ferreira on Thu, 30 April 2015 15:29
		Re: 3D point cloud visualization By: Nuno Ferreira on Tue, 26 May 2015 01:55

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