| Transparency for IDLgrVolume in IDL 6.1 [message #44835] |
Mon, 18 July 2005 12:26 |
Mary
Messages: 4
Registered: July 2005
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Junior Member |
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Hello,
I've read thru this group for the 'pimento problem' and 'alpha
blending' information. It's been very interesting and educational, but
I still haven't been able to correct the problem I'm having with
transparencies using IDLgrVolumes. I thought upgrading to IDL 6.1 would
make my life easier but no change so far...
I have 2 separate IDLgrVolume objects (1 large volume and 1 small
volume) and 1 IDLgrPolygon object. 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. However, I want the small volume and the polygon to
be opaque so that I cannot see them through each other. The small
volume and the polygon object may overlap in the 3D space, but I only
want to see the sections that don't overlap. I.e. I would like to be
able to visualize the depth of the small volume and the polygon within
the large volume and their position with respect to each other.
I'm trying to use IDL's 6.1 new capability for alpha channels with
IDLgrVolume for the larger volume, but with no success. The larger
volume is still opaque and I can't see through it. As another option,
I've tried to create & use the RGB_TABLE & OPACITY_TABLE properties for
the volumes but the transparency still dosn't look right.
Any suggestions on how to use the new ALPHA_CHANNEL property in IDL 6.1
correctly? Do I also need to use the other properties: RGB_TABLE,
OPACITY_TABLE, DEPTH_CUE, DEPTH_TEST_FUNCTION, COMPOSITE_FUNCTION,
ZBUFFER? How am I supposed to combine them?
Thank you for your help!
Mary
P.S. Once I get the correct settings for the transparency of the larger
volume, I'll still have to face the 'pimento problem' to be able to
view all objects in the correct positions. But that'll be a different
challenge...
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