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Re: Transparency for IDLgrVolume in IDL 6.1 [message #44818 is a reply to message #44817]

Tue, 19 July 2005 15:48

Mary
Messages: 4
Registered: July 2005

Junior Member

Karl,

thank you so much once again. Everything I saw today while playing with
the volumes makes sense now thanks to your explanation! =)

You're right, the two channels in grVolume is not suitable for my
application due to the unwanted background opacity that it would
create.

My original code was actually with both volumes combined into 1
IDLgrVolume object, as you just suggested. I was setting the opacity
table with value [255,255,255] for the smaller volume and BINDGEN(255)
for the larger volume and similar RGB tables. This didn't look
completely ok but I could've settled for it, except for the fact that
then the polygon object was not displayed correctly; it was going even
thru the smaller volume. It was as if the smaller object (which should
be opaque) was transparent with respect to the polygon and I could see
the polygon through the volume. Or, in other words, the polygon was
always 'in front' of the small volume, no matter what my viewing angle.
Would this have to do with the pimento problem?

Remember my problem: I have the large volume, the small volume, and a
polygon object and all 3 belong to the same IDLgrModel. I want to
display the small volume and the polygon within the large volume.
Hence, I want the large volume to be semi-transparent so that I can see
the small volume and the polygon object within it. But I also want to
be able to display the positioning of the small volume and the polygon
with respect to each other.

So, my questions now are: will I have to convert my polygon to a volume
to be able to display them all together? Is there an easy (IDL) method
for this? Or will I have to break up my polygon into different sections
and each section separately depending on the angle of view ('pimento
problem')? Is there an easy (IDL) method for this? Or do you have any
other (easier to implement) idea/suggestion for this?

Thanks again and best regards,
Mary

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[Message index]

		Re: Transparency for IDLgrVolume in IDL 6.1 By: Karl Schultz on Tue, 19 July 2005 17:08
		Re: Transparency for IDLgrVolume in IDL 6.1 By: Mary on Tue, 19 July 2005 15:48
		Re: Transparency for IDLgrVolume in IDL 6.1 By: Karl Schultz on Tue, 19 July 2005 14:10
		Re: Transparency for IDLgrVolume in IDL 6.1 By: Mary on Tue, 19 July 2005 11:46
		Re: Transparency for IDLgrVolume in IDL 6.1 By: Karl Schultz on Mon, 18 July 2005 14:02
		Re: Transparency for IDLgrVolume in IDL 6.1 By: Mary on Wed, 20 July 2005 13:22

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