Does this persist if you rotate the object around? If it changes from opaque to semi-opaque, maybe it's a renderer bug related to your graphics card (what system are you on?).
Turn on the AutoAxes grid: I'd be interested to know if the blade is really semi-transparent or not. I would expect to see white through the isolines, but I'm seeing a faint blue. If we can't see the axis grid through the blade, then the blade is there and opaque and we have to figure out why the isolines show 'through'.
You might also try this. Turn off the isolines. Do ShowConnections on the ShowBoundary output (to get the triangles rather than the connections of the blade's tets) and Collect the ShowConnections and ShowBoundary objects. This would also be plotting lines on the surface of the boundary. If the weird display persists, I'd suspect a render bug on your hardware. If it looks similar to the isolines, I'm not sure what it would be.
You haven't somehow applied a really large Options value for attribute "fuzz" to the isolines, have you? This oddly named attribute is used to tell the renderer about the Z-buffer depth of objects. If it were set rather high, the lines would appear to sit on top of the blade when rendered. This is not normal, so is probably not a likely explanation here. As far as I know, the only way to add "fuzz" is to explicitly with Options (or of course through imported data objects). Normally, DX attempts to render lines coincident with surfaces on "top" of the surface, but that should only apply to the frontmost isolines in your case.
On May 25, 2005, at 10:46 AM, Dragos MOROIANU wrote:
Thank you Chris for your reply,_______________________________
The object is a class field containing 3D data with connections of type
tetrahedra.
The domain consists of a computational volume from which a turbine blade was
extracted (logical substraction operation). In this way, a part of the boundary surface that confines the domain represents the surface of the blade.
You can see the domain, the blade and the pressure isolines at
http://www.fm.vok.lth.se/Staff/Priv/DM/water-turbine.html
Although the blade seems to be opaque in the first two images, in the last one
you can see the isolines from both sides of the blade.
I tried in many different ways to elude this problem but with no result. If
you can see the picture and give me a hint to solve it, I will be gratefull.
Dragos
Chris Pelkie
Scientific Visualization Producer
622 Rhodes Hall, Cornell Theory Center
Ithaca, NY 14853 (607) 254-8794
