houdini 16, pyro shader alpha for fire and smoke

[tagosaku]

hi, I have a question about pyroshader in houdini16.

There are fire shading and smoke shading parameters separately. That's why I was thinking we could control alpha of fire and smoke separately, too. However, when I change general > smoke > Density Scale value, it influences to fire alpha, too. Then if I set the density scale to zero, actually fire alpha also becomes zero although fire's RGB shows red-yellow color. Thus questions are:

1 - what's the reason/concept we don't have a separate "fire density(alpha) scale" parameter? (Of course, we can separate fire and smoke by AOV with smoke_mask and fire_mask.)  

2 - Let's say I need to create a custom shader for it. What kinds of two volume fields should I use for fire and smoke's alphas?  Also, inside of pyroshader, there is a pyroshadercore node, which is an essential node but cannot be unlocked.

[wys-fx]

That's right. cause fire alpha is base on emission. so you can't separate alpha from pyro shader. If you have a test render a fire without density . You will see alpha also zero.

I think no alpha is ok for render flame effects