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Can anyone explian this? May 23, 2019, 8:17 p.m.

it's not random, Button Strip parameter is a bitfield so you need to treat it accordingly
more info here:
http://www.sidefx.com/docs/houdini/hom/locations.html#button_strip_scripts [www.sidefx.com]

Solidify Node missing May 23, 2019, 10:17 a.m.

solidify is ophidden and marked as experimental so not sure if it's safe to use for production
you can run
opunhide Sop solidify::2.0
in the textport to expose it
or directly add it using opadd command

Extract RGBA channel informations from texture May 22, 2019, 11:19 a.m.

Texture Channel parm is to specify the AOV or layer in your image (for image formats that can hold image layers like .exr, .rat, …)
you can leave it blank for beauty layer

the clr output on your Texture VOP is Vector4 and contains RGBA channels for your layer (Texture Channel)
so just append Vector4-to-float VOP to split it to float R,G,B,A values

clr can also be Vector3 if the signature is RGB Values instead of RGBA Values, in that case you can use Vector-to-float