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Re: Transparency for IDLgrVolume in IDL 6.1 [message #44823 is a reply to message #44820]

Tue, 19 July 2005 11:46

Mary
Messages: 4
Registered: July 2005

Junior Member

Hello Karl,

thank you very much for your prompt response and the information you
gave me! I have a better understanding now of how the volumes are
rendered in IDL.

I ran your program a couple of times using different settings for rgb0,
rgb1, opacity0, and opacity1 to understand how they affect the display
of the image. I think I understand it now. I tried doing something
similar with the IDLgrVolume by setting data0 & data1 to each of my
volumes. However, I haven't been successful at seeing both volumes
within each other at the same time.

I noticed that the VOLUME_SELECT property is very important when the
volume object has different data. If VOLUME_SELECT = 0 then only data0
is shown. When VOLUME_SELECT = 1 then it is supposed to combine the
data0 & data1 using the rgb and opacity settings for each. I've been
playing with different settings (for rgb and opacity) all last night
and today. But it actually seems that IDL is only using the larger
volume with the rgb/opacity settings to mask the smaller volume, no
matter which one I set as data0 or data1. Does this make sense? It's
sort of what happens with the the sample code you sent, where vol1 is a
mask to vol0; you can't actually see both vol0 and vol1 at the same
time. (Did I understand your code correctly?)

However, that's not what I want: I actually need to see both volumes,
so that I can see the position of the smaller volume within the larger
volume. Can this be achieved with the data0/data1 properties of
IDLgrVolume? Is there any other property I need to set? (I also played
with ZERO_OPACITY_SKIP but it didn't help).

Further comments and suggestions from you would be GREATLY appreciated!

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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