Assign Detail Attribute To Channel?

[Atom]

Hi All,

 

I have an integer detail attribute. I want to use that value down stream as the number of segments for a ReSample node. I have read you can use the detail function to accomplish this but when I place it in the segs field, I get an error "Unable To Evaluate Expression".

detail(geoself(),"resample_count",0)

This is probably because I am using VEX in an Hscript field.

What is the correct syntax to accomplish this task?

[alican]

Instead of using geoself(), this should work detail(opinputpath(".",0), "resample_count", 0)

[f1480187]

http://www.sidefx.com/docs/current/expressions/

You need to use detail expression function, since parameters accept only HScript Expression or Python expressions. The function differs from VEX alternative, due to semantic differences.

[Atom]

Thanks for the info I'll give that a try.

 

In the meantime i came up with a brute-force pythonic way to accomplish this but it takes a few more lines of code.

node = hou.pwd()
geo = node.geometry()
def fetchIfObject (passedName):
    # Return a named item if it exists.
    try:
        result = hou.node(passedName)
        if result == 0:
            result = None
    except:
        result = None
    return result

# Fetch from the node that has the number of points we are going to reshape.
ob_source_points = fetchIfObject("/obj/animate_trails/group_morph_candidates")
if ob_source_points:
	for pg in ob_source_points.geometry().pointGroups():
		if pg.name() == 'morph_candidates':
			point_count = len(pg.points())
			#print ("source node has %d points." % point_count)
			if point_count > 1:
				# Adjust the downstream resample to have this same number of points.
				ob_resample = fetchIfObject("/obj/animate_trails/resample_SAME_COUNT_AS_POPNET_POINTS")
				if ob_resample:
					# Assign the count value to the segs channel on the node.
					ob_resample.parm('segs').set(point_count-1)

Edited June 20, 2016 by Atom