Ok, I see where you're going, and you're correct, there's no double4 output.
You could make an array of doubles, but my question is why you'd want a
Quaternion as an output--to my knowledge, Maya does process rotations
internally as a Quaternion, but it converts those to Euler's before it
outputs, and I don't know of any plugs that take a Quaternion.
When I've used Quaternions, I normally build my Quaternion internally,
use it, and then output as a float3 after converting to a Euler with the
appropriate rotation order.
You can do this pretty easily with MEulerRotation--it has
asQuaternion(), and MQuaternion has asEulerRotation.
Once you've converted to a MEulerRotation, it's pretty straightforward
to put it into a rotation data set.
You basically will need to set up three attributes (rotationX,
rotationY, rotationZ) as MFnUnitAttributes with a type of
MFnUnitAttribute::kAngle, and then a MFnNumericAttribute (rotation) with
the three rotation attributes. At least that's how I do it--the setup
looks something like this in c++ (but Python's very similar), in the
initialize() function:
MFnNumericAttribute nAttr;
MFnUnitAttribute uAttr;
aRotX = uAttr.create("rotateX", "rx", MFnUnitAttribute::kAngle);
uAttr.setWritable(false);
uAttr.setStorable(false);
aRotY = uAttr.create("rotateY", "ry", MFnUnitAttribute::kAngle);
uAttr.setWritable(false);
uAttr.setStorable(false);
aRotZ = uAttr.create("rotateZ", "rz", MFnUnitAttribute::kAngle);
uAttr.setWritable(false);
uAttr.setStorable(false);
aOutRotation = nAttr.create("outRotation", "or", aRotX, aRotY, aRotZ);
nAttr.setWritable(false);
nAttr.setStorable(false);
nAttr.setArray(true);
Then you just use set3Double to set them.
On 3/12/2015 7:03 PM, yaoys wrote:
But the problem is how to set the value with MDataHandle?
e.g.
MDataHandle dh = datablock.outputValue(myNode.aQuaternion)
dh.set?(...) # there is not interfaces for set double4 or quaternion
dh.setClean()
Cheers
yao
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