So let's create a simple scene, a box with Cd and Alpha attributes with some randomization.

It's works well so far, so I export the geo as fbx to other application(Unity3d or C4D) but the Alpha attribute doesn't works.
I re-import the geo with the file node, and I find the strange attribute named "Alpha2“ holds correct alpha value. And the ”Alpha" attribute gets the wrong value.

Is it a bug or something else I don't know?
I get the same result in H17 and H16.5

I attached the simple scene if you want to test.

Attachments:
HoudiniTest_Screenshot01.png (511.6 KB)
HoudiniAlphaTest.hip (112.0 KB)
HoudiniTest_Screenshot02.png (596.9 KB)

So I find the problem. I export the fbx file as ASCII, and I find the Color attribute somehow be compressed.

And the Alpha attribute become User Data, which should be in the a channel of color.
It's quite annoy.

Attachments:
HoudiniTest_Screenshot03.png (553.1 KB)