I'm trying to link multi parm ramp to a for loop. all the other parameter is ok with detail(-1,“ivalue”,0) as the index except for the ramp parameter itself. It works well if I unlock the hda but raise errors(Invalid Source) when match the definition. It isn't the problem of permission and seems a bug of Houdini.

Attachments:
20191221171215.png (185.4 KB)

It looks like multiparm block with ramp parameter is buggy in Houdini. Especially with compiled block will cause Houdini to crash instantly.
I've attached the hip file if someone interest.
I personally with go on use chramp() with VEX later, but hopefully, this problem may be fixed years later.

Attachments:
Multi_Ramp_Bug.gif (2.3 MB)
Multi_ramp_bug.hip (167.8 KB)