How to multiply `material.opacityNode`, not replace it?

[trusktr]

Thank you! Now I’m stuck in this one, where I believe the opacity handling is correct based on the above, but perhaps I’m not able to port vMapUv correctly:

How to port vMapUv to TSL?

Ok the conditional check probably does work. I realized the way to discard pixels for opacityNode in this thread, basically this works: material.opacityNode = Fn(() => { const alphaFactor = float(0.2) const newOpacity = materialOpacity.mul(alphaFactor) // this works If(newOpacity.lessThanEqual(0), () => Discard() ) return newOpacity })() Now if I update to try to get the alphaFactor based on the map uv like follows, it doesn…