On 2007-05-24, at 12:35 , Don Murray wrote:
Ken Mankoff wrote:
I've browsed the manual and think the answer to the following
'no' (at least I didn't see any screenshots that showed this) but
Can IDV do transparent iso volumes rather than hard iso surfaces.
screenshot of what I'd like to do in IDV is here:
I know IDV can do the gray iso surface, but what about the yellow/
You could do this with a combination of the Volume Rendering
control and an isosurface. Set the transparency on the volume
rendering to be about 90%. You'll also need to use the View->To Front
option for the Volume control to be able to see the embedded
OK I forget about Volume Rendering (FYI that string isn't even in the
manual). I've done that. By default, I cannot see through the top
layer, so I set the transparency of the colorbar. Example screenshot
But there is a difference between this and the previous image. In the
original image, transparency is a function of data value (in addition
to color). What I've done in IDV has color as a function of value,
but transparency is just applied to the whole data set uniformly.
I chose 50% transparency in the above image. For this specific image
it looks like since there are 4 layers that each layer is 12.5%
opaque (87.5% transparent). The four layers therefore are 50%
transparent as a total.
Is there a different way to get transparency applied to the data set
as a function of the data set? For example, looking at a rain cloud,
I'd like to color the data based on moisture content, but have
transparency based on particle density. This would give a somewhat
realistic view, in that when there are more particles it gets harder
to see through a cloud.
Also, on this image, I've added an isosurface, but I cannot see it
through the 'transparent' volume layers.