diffuseTransmissionTexture is ignored?

[echadwick-artist]

Example asset: KhronosGroup/glTF-Sample-Assets#165

When loaded into glTF Sample Viewer, the leaves show very strong transmission color, compared to Babylon.js Sandbox:

It looks like the diffuseTransmissionTexture is being ignored? Debug Mode for Diffuse Transmission Color seems to show only the value for diffuseTransmissionFactor: 0.4.

[UX3D-haertl]

This texture is used as diffuseTransmissionTexture: https://github.com/KhronosGroup/glTF-Sample-Assets/blob/fbcb702b5bd1014d092e7390a85515598bed7950/Models/DiffuseTransmissionPlant/glTF/img5.jpg
The spec says the relevant value is stored in the alpha channel, but the texture does not provide an alpha channel (alpha is always set to 1.0)

[UX3D-haertl]

If I change the channel in the shader to e.g. red, it looks correct:

[echadwick-artist]

Aha thanks for this! I will change the texture.