1

我想通过 MEL 脚本在 Maya 中创建 NURBS 曲线，将其绑定到我的插件并简单地更新插件（和视口）中的 CV。问题是我认为不可能读取和写入相同的形状。这是 MEL 代码：

curve -p 0 10 0 -p 5 0 0 -p 5 0 5 -p 0 0 5;
createNode FurrySystemNode -n furry;
connectAttr time1.outTime furry.time;
connectAttr curveShape1.local furry.input_curve;
connectAttr furry.output_curve curveShape1.create

插件中输入属性的位置和input_curve位置。output_curve尝试创建时失败，MFnNurbsCurve因为curve_obj为空。如果我写入另一个形状作为输出，它工作得很好。

MStatus FurrySystemNode::compute(const MPlug& plug, MDataBlock& data) {
  if (plug == output_curve) {
    cout << "Computing input_curve\n";

    MStatus stat;
    MDataHandle handle = data.inputValue(input_curve, &stat);
    MDataHandle output_handle = data.outputValue(output_curve, &stat);
    McheckErr(stat, "Failed at getting data.inputValue\n");
    MObject curve_obj = handle.data();

    MFnNurbsCurve curve_fn(curve_obj, &stat);
    McheckErr(stat, "Failed at creating the MFnNurbsCurve function set\n"); // Fails here

    MPointArray cvs;
    stat = curve_fn.getCVs(cvs, MSpace::kWorld);
    for (int i = 0; i < cvs.length(); i++) {
      cvs[i] += MPoint(i, 0, 0);
    }

    curve_fn.setCVs(cvs, MSpace::kWorld);
    curve_fn.updateCurve(); // Don't think this one is needed
    output_handle.set(curve_obj);
    stat = data.setClean(plug);
    McheckErr(stat, "Failed at cleaning data\n");
  }
  return MS::kSuccess;
}

有任何想法吗？

4

0 回答 0