texture blend whit alpha channel

[belin-chu]

HI,
can anyone solve this topic?

I want to blend a texture in to another using a gradient alpha channel inside
a given shader.

If I try wiht the first texture layer whit an alpha channel made using a
gradient I get only a sharp strip to the layer behind, meanwhile I need a
transparency as smooth as the gradient inside the alpha channel.

I get something better when I try using 3 layers, the 1st the texture "A", the
2nd a B/W gradient and the 3rd the texure "B", but I can only get a good
transparency only to the second layer and the third layer remains hidden.

In other words I want to get the same effect when using 2 layers in
Photoshop: the top one whit a mask level to give transparency to the bottom one.
Thanx

[Newt99]

Did you set the Texture Render Format to #RGBA8888 (24 bit with an 8 bit alpha
channel) ?

The default Shockwave 3D texture render format is #RGBA5551 (15 bit with a 1
bit alpha channel) which means you only get a coarse gradient.

By the way, you may also check the following article in the Macromedia
Developer Center about creating alpha channel bitmaps.

Karl.

[belin-chu]

thanx Karl,

I will be trying in these days.
The link is very useful in the last part, it gave me interesting hints about the next steps of my project.