How to display an image on RGL plot?

The underlying picture is a JPEG image, loaded with the rimage package and
coerced to the matrix.
Spheres denote control points, collected from this picture and must be
situated over the certain points of the image.
I display the image with rgl.points.
In case of the standard video camera image (704x576) it has to display over
400000 points which is rather slow and memory consuming.
How can I put an original JPEG on this plot?

Another problem is that the picture is color initially, but was converted to
the grayscale. I'd like to preserve colors.

Try using surface3d with a flat surface (z=0) and a matrix of colours
in the col= argument. See help(surface3d) for an example.

 Also STOP POSTING!!! There seems to be about 8 copies of your message
in my inbox!!!

Barry

Hi all.
It's been a long time since I wrote to this list. Glad to see the R project
well and working.

I am working  with a 3D plot similar to this: 
http://old.nabble.com/file/p26525177/rgl-device.png rgl-device.png 

The underlying picture is a JPEG image, loaded with the rimage package and
coerced to the matrix. 
Spheres denote control points, collected from this picture and must be
situated over the certain points of the image.
I display the image with rgl.points. 
In case of the standard video camera image (704x576) it has to display over
400000 points which is rather slow and memory consuming. 
How can I put an original JPEG on this plot?

Another problem is that the picture is color initially, but was converted to
the grayscale. I'd like to preserve colors.

I can't see that image; the link doesn't work.  But the best way to 
display an image in rgl is to use texture mapping.  There are examples 
in ?persp3d (where the texture is a world map, displayed on a globe) and 
demo(flag).  See ?rgl.surface for a description of how texture 
coordinates are specified.

Duncan Murdoch

Barry Rowlingson <b.rowlingson at lancaster.ac.uk>
    on Thu, 26 Nov 2009 08:18:51 +0000 writes:

>> The underlying picture is a JPEG image, loaded with the rimage package and
    >> coerced to the matrix.
    >> Spheres denote control points, collected from this picture and must be
    >> situated over the certain points of the image.
    >> I display the image with rgl.points.
    >> In case of the standard video camera image (704x576) it has to display over
    >> 400000 points which is rather slow and memory consuming.
    >> How can I put an original JPEG on this plot?
    >> 
    >> Another problem is that the picture is color initially, but was converted to
    >> the grayscale. I'd like to preserve colors.
    >> 

    > Try using surface3d with a flat surface (z=0) and a matrix of colours
    > in the col= argument. See help(surface3d) for an example.

    > Also STOP POSTING!!! There seems to be about 8 copies of your message
    > in my inbox!!!

I hope it has ended now, with 12 copies.

We've seen this once in the past, and also there, it
was the Nabble interface (!)

Personally I'd really prefer people would use regular
subscriptions and regular e-mail for posting to the R mailing
lists.

Martin Maechler,  ETH Zurich,  
       		  provider of the major R mailing lists


    > Barry

    > ______________________________________________
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    > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
    > and provide commented, minimal, self-contained, reproducible code.