attach a screenshot of what you are seeing -Nick
On Wed, Jun 30, 2010 at 6:25 PM, Tim Larson <[email protected]> wrote: > Thank you. > > I've experimented with enabling blending by calling > pStateSet->setMode(GL_BLEND) on my geometry. I've also experimented with > creating a material for the geometry that has an alpha value. > Unfortunately, this does not have the desired effect. Applying an alpha > value to the material for the geometry makes the entire geometry and image > partially transparent. I would like to have the transparency level > determined by the alpha values within my image. The image has some areas > that are completely transparent and some areas that are completely opaque. > The Image is a TGA image with alpha transparency. > > I can confirm that the transparency of the image is intact, because if I > change the color of the geometry's material, I can see that color "behind" > the image. > > But, my goal is to have the geometry on which the image placed be invisible > so that all that is seen is the image. And, the user can see through the > transparent elements of the image to the background or to other geometries > that may be behind. > > I've attached the small source file and my actual image. > > Thank you for your assistance. > > Tim > > > J.P. Delport wrote: > > Hi, > > > > did you enable blending in your scene? What format texture are you > loading? > > > > jp > > > > On 29/06/10 23:34, Tim Larson wrote: > > > > > I am attempting to utilize a transparent image as a texture map. > > > > > > I can successfully display the transparent image as a texture on a > simple rectangular geometry. > > > > > > But, I would like to be able to "see through" to the background > wherever the image is transparent. > > > > > > I've utilized the osgHelp program "GeometryTexture" as a baseline and I > can load my image, but the transparent parts of the image show through to > the default gray material of the underlying geometry. I see a gray > rectangle with my image on top of it. Even though my image has many > transparent areas. > > > > > > I would like to be able to see through the transparent areas of the > image into the background. i.e. If all I have on the screen is a single > rectangular geometry with my transparent image, then I'd like to see the > blue background through the transparent parts of my image. > > > > > > Can anyone give me a pointer or advise? > > > > > > Thanks in Advance. > > > > > > Tim > > > > > > ------------------ > > > Read this topic online here: > > > http://forum.openscenegraph.org/viewtopic.php?p=29503#29503 > > > > > > > > > > > > > > > > > > _______________________________________________ > > > osg-users mailing list > > > > > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > > > > > > -- > > This message is subject to the CSIR's copyright terms and conditions, > e-mail legal notice, and implemented Open Document Format (ODF) standard. > > The full disclaimer details can be found at > http://www.csir.co.za/disclaimer.html. > > > > This message has been scanned for viruses and dangerous content by > MailScanner, > > and is believed to be clean. MailScanner thanks Transtec Computers for > their support. > > > > _______________________________________________ > > osg-users mailing list > > > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > ------------------ > > Post generated by Mail2Forum > > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=29521#29521 > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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