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Re: IDLgrSurface with transparent lines? [message #39170 is a reply to message #39169]

Thu, 29 April 2004 07:05

Karl Schultz
Messages: 341
Registered: October 1999

Senior Member

"Antonio Santiago" <d6522117@est.fib.upc.es> wrote in message
news:4090B32E.1040409@est.fib.upc.es...
> Hi,
>
> is there a way i can draw an IDLgrSurface object with STYLE=1 (line
> style) and this lines be semi transparen, like a transparent texture
image.

A sort of quiet feature in IDL 6.0 is that texture mapping is applied to
lines. The following test demonstrates this ability:

pro test
img = BYTARR(4,2,2)
img[1,*,*] = 255 ; green
img[3,*,*] = 100 ; alpha
oTexture = OBJ_NEW('IDLgrImage', img)
oSurface = OBJ_NEW('IDLgrSurface', DIST(45), $
COLOR=[255,255,255], STYLE=1, THICK=3, TEXTURE_MAP=oTexture)
READ_JPEG, FILEPATH('rose.jpg', SUBDIR=['examples','data']), img, /TRUE
oTexture2 = OBJ_NEW('IDLgrImage', img)
oPolygon = OBJ_NEW('IDLgrPolygon', [0,1,1,0]*45, [0,0,1,1]*45, $
COLOR=[255,255,255], TEXTURE_MAP=oTexture2, $
TEXTURE_COORD=[[0,0],[1,0],[1,1],[0,1]])
oModel = OBJ_NEW('IDLgrModel')
oModel->Add, [oPolygon, oSurface]
XOBJVIEW, oModel
end

If you leave the XOBJVIEW settings at their default values, then when you
click on the model to rotate it, the "drag quality" goes to medium which
lets you easily see what it looks like without transparency.

There will be an easier way to do this in IDL 6.1.

Karl

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[Message index]

		Re: IDLgrSurface with transparent lines? By: Antonio Santiago on Thu, 29 April 2004 08:45
		Re: IDLgrSurface with transparent lines? By: Karl Schultz on Thu, 29 April 2004 07:05
		Re: IDLgrSurface with transparent lines? By: Rick Towler on Thu, 29 April 2004 10:22

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