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Re: Depth visibility with Object Graphics !!! [message #39514 is a reply to message #39477]

Wed, 26 May 2004 06:17

btt
Messages: 345
Registered: December 2000

Senior Member

Antonio Santiago wrote:
> Sorry, but I can't obtain any good result with your ideas. I have been
> playin with DEPTH_TEST_xxx atributes but nothing, perhaps i am a
> squar-head :)
>
> I attach a little file with my problem. First i add to the model the
> "line" an then the "image". I change the values of DEPTH_TEST_FUNCTION,
> DEPTH_TEST_DISABLE and DEPTH_TEST_WRTIE but i can't do the line
> overdrawn the image.
>

I never have gotton a good feel for the DEPTH_**** keywords. Below is
a simple approach that puts the places the image on a polygon as a
texture map.

Rick pointed out that it is sometimes advantageous to transform the
whole shebang out of pixel space into real data space. This example
does just that... in fact, if the pixel size was important for your work
you could get away from the normalization and work in "raw" data
coordinates. For 2d objects graphics (usually images with ROIs and
axes) I usually don't normalize.

oImage = OBJ_NEW('IDLgrImage', img)

opolygon = OBJ_NEW('IDLgrPolygon', $
[0, 0, sizes[1]-1, sizes[1]-1], $
[0, sizes[2]-1, sizes[2]-1, 0], $
Color = [255,255,255], $
XCOORD_CONV=xnorm, YCOORD_CONV=ynorm, $
Texture_Map = oImage, $
TEXTURE_COORD = [[0,0], [1,0], [1,1], [0,1]])

oModel->Add, opolygon

oWindow->Draw, oView

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[Message index]

		Depth visibility with Object Graphics !!! By: Antonio Santiago on Mon, 24 May 2004 11:07
		Re: Depth visibility with Object Graphics !!! By: David Fanning on Wed, 26 May 2004 07:05
		Re: Depth visibility with Object Graphics !!! By: btt on Wed, 26 May 2004 06:17
		Re: Depth visibility with Object Graphics !!! By: Antonio Santiago on Tue, 25 May 2004 23:48
		Re: Depth visibility with Object Graphics !!! By: Karl Schultz on Wed, 26 May 2004 07:30

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