attach a screenshot of what you are seeing
-Nick
On Wed, Jun 30, 2010 at 6:25 PM, Tim Larson tlar...@hunter.com 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
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