comp.lang.idl-pvwave archive: archive » Re: texture

Home » Public Forums » archive » Re: texture_coord

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: texture_coord [message #27743 is a reply to message #27742]

Thu, 01 November 2001 09:53

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Karl Schultz writes:

> It isn't that bad, but it is sort of hard to explain. Code helps - see the
> bottom of this post.

OK, thanks, Karl. That certainly wasn't what the
documentation implied, but what else is new. :-)

Here is the deal. To map an image onto the *entire*
surface, this code works. (Note that Scale_Vector
is a function found on my web page. You can scale
the array however you like. It must be scaled
into the range of 0 to 1.)

ss = Size(surfaceData, /Dimensions)
texcoords = FltArr(2, ss[0], ss[1])
texcoords[0,*,*] = Scale_Vector(Findgen(ss[0]) # $
Replicate(1,ss[1]), 0.0, 1.0)
texcoords[1,*,*] = Scale_Vector(Replicate(1,ss[1]) #
Findgen(ss[0]), 0.0, 1.0)

To place the image on a portion of the surface,
you have to modify the values appropriately. Here my
surface is an array of (200,100) in size and I wish
to place the image with the lower-left corner at (40,30)
and the upper-right corner at (129,59). Thus the image
will occupy a 90x30 "chunk" of my surface.

texcoords = FltArr(2, ss[0], ss[1])
texcoords[0,40:129,30:59] = Scale_Vector(Findgen(90) # $
Replicate(1,30), 0.0, 1.0)
texcoords[1,40:129,30:59] = Scale_Vector(Replicate(1,30) # $
Findgen(90), 0.0, 1.0)

In either case, the surface is created like this:

thisSurface = OBJ_NEW('IDLgrSurface', surfaceData, Style=2, $
Color=[255,255,255], Texture_Map=thisImage, $
Texture_Coord=texcoords

I'll write up an article about this later today.

Cheers,

David

--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/

Report message to a moderator

[Message index]

		Re: texture_coord By: Mark Hadfield on Sun, 04 November 2001 13:23
		Re: texture_coord By: David Fanning on Sun, 04 November 2001 08:53
		Re: texture_coord By: Karl Schultz on Fri, 02 November 2001 09:49
		Re: texture_coord By: David Fanning on Fri, 02 November 2001 09:30
		Re: texture_coord By: Pavel A. Romashkin on Fri, 02 November 2001 09:16
		Re: texture_coord By: David Fanning on Fri, 02 November 2001 09:04
		Re: texture_coord By: Karl Schultz on Fri, 02 November 2001 08:46
		Re: texture_coord By: Karl Schultz on Fri, 02 November 2001 08:39
		Re: texture_coord By: David Fanning on Fri, 02 November 2001 07:09
		Re: texture_coord By: Mark Hadfield on Thu, 01 November 2001 18:48
		Re: texture_coord By: David Fanning on Thu, 01 November 2001 17:31
		Re: texture_coord By: Mark Hadfield on Thu, 01 November 2001 17:07
		Re: texture_coord By: David Fanning on Thu, 01 November 2001 16:34
		Re: texture_coord By: Harald von der Osten-[1] on Thu, 01 November 2001 10:48
		Re: texture_coord By: David Fanning on Thu, 01 November 2001 09:57
		Re: texture_coord By: David Fanning on Thu, 01 November 2001 09:53
		Re: texture_coord By: Karl Schultz on Thu, 01 November 2001 08:11
		Re: texture_coord By: David Fanning on Thu, 01 November 2001 07:18

Previous Topic:	Re: _Ref_Extra : BUG? (in Win2K 55b) corrected test file
Next Topic:	Homogenity of an area

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Thu Oct 09 22:26:20 PDT 2025

Total time taken to generate the page: 0.48475 seconds