Is there a way to export curve data from Maya to a text file?

Glacierfox

Hi there. Long story short, I need a way of importing curves into Unreal 4. Drawing the curves manually in the viewport just isn't precise enough for what I need. I need multiple copies of these curves to spread around a different level.

I found a MaxScript online which exports the spline data out of MAX and into a text file and I am able to create a curve out of this using a data table in Unreal 4. The problem is, all of my curves are already drawn out in Maya and importing those same curves into MAX converts them into NURBS which can't be exported in the same manner. I literally have around 50 of these perfectly drawn curves sitting in Maya.

Does anyone have knowledge of a way I can do this in Maya? I'm not very good with Python but I can try and convert the Max script over but I am not sure which parts of the Maya Bezier curves correspond similar components.

Here's a copy of the MaxScript if anyone would like to take a look or take advantage of it. 

https://pastebin.com/FFDDLhi3

Thanks for any help.

onionhead_o

PolyCount Bruddahs will show you te ways

radiancef0rge

Maybe try this, saw it the other day.. 

https://forums.unrealengine.com/unreal-engine/events/105795-training-stream-spline-importing-w-alan-noon-jan-10th-live-from-epic-hq/page2

Glacierfox

radiancef0rge said:

Maybe try this, saw it the other day.. 

https://forums.unrealengine.com/unreal-engine/events/105795-training-stream-spline-importing-w-alan-noon-jan-10th-live-from-epic-hq/page2

That's the video I got the above MaxScript from thanks though.

ProperSquid

I haven't tested this, but something like this will work:

import json
import maya.OpenMaya as openmaya

dagIter = openmaya.MItDag(openmaya.MItDag.kDepthFirst, openmaya.MFn.kCurve)
output = []

# Iterate through all of the dag nodes and get the curves.
while not dagIter.isDone():
    curveIter = openmaya.MItCurveCV(dagIter.currentItem())
    curve = openmaya.MFnDagNode(dagIter.currentItem())
    dagIter.next()
    # Create an object to store the curve info.
    node = {"name": curve.name(), "points": []}

    # Iterate through all of the points in the curve and store it.
    while not curveIter.isDone():
        pos = curveIter.position()
        curveIter.next()
        node["points"].append([pos.x, pos.y, pos.z])

    # Add the object to the output
    output.append(node)

# Save as a json file (or switch this up to use another format)
with open("/path/to/output.json", mode="w") as fOut:
    json.dump(output, fOut)

radiancef0rge

 Glacierfox said:

That's the video I got the above MaxScript from thanks though.

the pymel script is in post 24.

Glacierfox

radiancef0rge said:

 Glacierfox said:

That's the video I got the above MaxScript from thanks though.

the pymel script is in post 24.

Brilliant thanks! I didn't even see that.

ProperSquid said:

I haven't tested this, but something like this will work:

import json
import maya.OpenMaya as openmaya

dagIter = openmaya.MItDag(openmaya.MItDag.kDepthFirst, openmaya.MFn.kCurve)
output = []

# Iterate through all of the dag nodes and get the curves.
while not dagIter.isDone():
    curveIter = openmaya.MItCurveCV(dagIter.currentItem())
    curve = openmaya.MFnDagNode(dagIter.currentItem())
    dagIter.next()
    # Create an object to store the curve info.
    node = {"name": curve.name(), "points": []}

    # Iterate through all of the points in the curve and store it.
    while not curveIter.isDone():
        pos = curveIter.position()
        curveIter.next()
        node["points"].append([pos.x, pos.y, pos.z])

    # Add the object to the output
    output.append(node)

# Save as a json file (or switch this up to use another format)
with open("/path/to/output.json", mode="w") as fOut:
    json.dump(output, fOut)

I'm going to give this a go for sure. This is greatly appreciated. Thanks for your time.

Maddog4america

 How exactly do I use this code?