[vtkusers] Texture Map Opacity?

[Steven Koch]

In the Visualization Toolkit (4th Edition, Page 216) it states:

"Besides the different ways in which a texture map can be defined, there 
are options in how it interacts with the original color of the object.  A 
common option for RGB and RGBA maps is to ignore the original color; that 
is, just apply the texture color as specified.  Another option is to 
modulate the original color by the texture map color (or intensity) to 
produce the final color."

When I apply a texture map to a vtkPolyData actor, the surface color of 
the actor bleeds through the texture map.  Other than the book reference 
above, I can not find any information about how to control the 'opacity' 
of a texture map when it is applied to a 
vtkPolyData--->vtkPolyDataMapper--->vtkActor.  My vtkPolyData object is a 
terrain map derived from an vtktImageData--->vtkWarp and the color is set 
using a vtkColorTransferFunction to map the single component scalar.

Could someone please point me in the right direction?

Steve Koch

_________________________________________________________________________

The information transmitted is intended only for the person or entity to
which it is addressed and may contain confidential and/or privileged
material.  Any review, retransmission, dissemination or other use of, or
taking of any action in reliance upon, this information by persons or
entities other than the intended recipient is prohibited.   If you
Received this in error, please contact the sender and delete the material 
from any computer.
_________________________________________________________________________
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20070308/17d021ae/attachment.htm>