MaxPlus Python - 3Ds Max - Add Worldspace Modifier

cgtoolsmith

Hi!

I'm trying to learn MaxPlus/Python in 3Ds Max, and I'm stuck with creating a worldspace modifier. (Path Deform Binding WSM modifier)

mod = MaxPlus.Factory.CreateWorldSpaceModifier(MaxPlus.ClassIds.PathDeformSpaceWarp)
MaxPlus.ModifierPanel.AddToSelection(mod)

Above code gives the following error:

File "C:\Program Files\Autodesk\3ds Max 2017\MaxPlus.py", line 30534, in CreateWorldSpaceModifier
    return _MaxPlus.Factory_CreateWorldSpaceModifier(*args)
RuntimeError: creation failure

Not sure why it happens, maybe the class ID is wrong? Adding object space modifiers works like a charm.

My current workaround is using the new pymxs:

<pre># pymxs part
rt.execute("meshObj=$")
rt.modpanel.addmodtoselection(rt.SpacePathDeform())
rt.meshObj.modifiers[0].path = rt.s</pre>

But that feels really hacky. Any ideas?

Thanks!

cgtoolsmith

Solved!

mod = MaxPlus.Factory.CreateWorldSpaceModifier(MaxPlus.Class_ID(0x000110b4, 0x00007f9e))
MaxPlus.ModifierPanel.AddToSelection(mod)

Full answer: http://stackoverflow.com/questions/3...space-modifier

monster

@Swordslayer

I understand how the fix works, but why doesn't the original code work?

print MaxPlus.ClassIds.PathDeformSpaceWarp
output: Class_ID(0x000110b5, 0x00007f9e)

cgtoolsmith

Interesting question @monster, because the ClassIds 'MaxPlus.ClassIds.PathDeformSpaceWarp' does exist in the MaxPlus Python API.

But the output from your post is different to the ClassID requested by maxscript: $.modifiers[1].ClassID: (MaxPlus.Class_ID(0x000110b4, 0x00007f9e). (Notice the last nr of the first part is different) It could be: 1) ClassIds.PathDeformSpaceWarp is something else inside MaxPlus? Not a modifier? 2) Bug in MaxPlus? 3) Something else?

monster

I didn't notice the different number! Ha!

It must be a bug. See the comment in the first function here. Same type of thing.

http://docs.autodesk.com/3DSMAX/16/ENU/3ds-Max-Python-API-Documentation/index.html?url=py_ref/demo_class_types_8py-example.html,topicNumber=py_ref_demo_class_types_8py_example_html59dc1b6f-ee19-4624-a8b8-5ed511f9030b

cgtoolsmith

Aha! Okay, I will use 'real' ClassIDs for now. I have to get used to these ClassIDs.