x3d - what blend modes to use

Question

What blend modes and attributes must I use to achieve following effect:

First texture is a tileable grass texture and second texture is the opacity mask for that texture.

<MultiTexture mode='"MODULATE" "?"'>
    <ImageTexture repeatS="true" repeatT="true" url='"grass.jpg"' />
    <ImageTexture url='"grass_opacity.png"' />
    <MultiTextureTransform>
        <TextureTransform scale="8 8"/>
        <TextureTransform/>
    </MultiTextureTransform>
</MultiTexture>

Using: "SELECTARG2, SELECTARG1" seems only to work with hard masks, either 0 or 100% opacity.

Using Bs Contact player.

Answer 1

Correct blending is:

<MultiTexture mode='"SELECTARG2,SELECTARG1" "BLENDCURRENTALPHA,DIFFUSE_SELECTARG2"'>

but Bs Contact player does not supports it in x3d file format. With vml its no problem.