topic Re: How do I move / rotate the mesh? in Fusion API and Scripts Forum

How do I move / rotate the mesh?

shutov441-vuz — Fri, 23 Oct 2020 14:47:53 GMT

Hi,

I have a task. I need to rotate and move imported stl model, i do it like this:

... dlg = ui.createFileDialog() dlg.title = 'Open STL File' dlg.filter = 'Model (*.stl);;All Files (*.*)' if dlg.showOpen() != adsk.core.DialogResults.DialogOK : return filename = dlg.filename ModelStl = root.meshBodies ModelStl.add(filename, adsk.fusion.MeshUnits.CentimeterMeshUnit) ...

and then i should to rotate and move this model. I found this topic

https://forums.autodesk.com/t5/fusion-360-api-and-scripts/bug-move-feature-is-broken/m-p/9223668

it works fine, but i need to do it inside one script. I tried to move the mesh like a default object, but it throws errors.

something like this...

rotateModel = adsk.core.Matrix3D.create() rotateModel.setToRotation(math.pi / 2.0, adsk.core.Vector3D.create(1,0,0), adsk.core.Point3D.create(0,0,0)) moveFeats = root.features.moveFeatures moveFeatureInput = moveFeats.createInput(ModelStl, rotateModel) moveFeats.add(moveFeatureInput)

Re: How do I move / rotate the mesh?

BrianEkins — Fri, 23 Oct 2020 15:00:53 GMT

Unfortunately, the API doesn't currently support moving a mesh body. There have been significant changes/enhancements made to the move command and the API has not yet been updated to support these. Hopefully, not too far in the future.

Re: How do I move / rotate the mesh?

Anonymous — Thu, 10 Dec 2020 12:11:54 GMT

Hi @shutov441-vuz,

like @BrianEkins said, there is no method in the fusion API to move/rotate a MeshBody.

But you can use the trimesh-library to create a non-fusion-mesh, move/transform this and add this transformed mesh back to fusion.

You'll need the trimesh-lib, as well as the numpy-lib.

You can use a class I created recently:

import numpy as np import trimesh as tri import adsk.core, adsk.fusion class MyTrimesh(): """Class handles the trimesh functionality """ def __init__(self): self.trimesh = tri.base.Trimesh() def create_from_fMesh(self, fmesh:adsk.fusion.MeshBody): """creates a Trimesh from a Fusion-MeshBody""" self.trimesh = tri.base.Trimesh( vertices=np.reshape(fmesh.mesh.nodeCoordinatesAsDouble,(-1,3)), faces=np.reshape(fmesh.mesh.triangleNodeIndices,(-1,3)), vertex_normals=np.reshape(fmesh.mesh.normalVectorsAsDouble, (-1,3))) self.trimesh.merge_vertices(merge_tex=True, merge_norm=True) def create_from_bRep(self, brep:adsk.fusion.BRepBody): """creates a Trimesh from a bRepBody""" mgr = brep.meshManager.createMeshCalculator() mgr.setQuality(adsk.fusion.TriangleMeshQualityOptions.LowQualityTriangleMesh) meshbody = mgr.calculate() self.trimesh = tri.base.Trimesh( vertices=np.reshape(meshbody.nodeCoordinatesAsDouble, (-1, 3)), faces=np.reshape(meshbody.nodeIndices, (-1, 3)), vertex_normals=np.reshape(meshbody.normalVectorsAsDouble, (-1, 3))) self.trimesh.merge_vertices(merge_tex=True,merge_norm=True) def transform(self, matrix:adsk.core.Matrix3D): """executes a transformation on the trimeshBody""" self.trimesh.apply_transform(np.reshape(matrix,(-1,3))) def add_to_component(self, comp:adsk.fusion.Component) -> adsk.fusion.MeshBody: """adds the Trimesh to the components meshBodies and returns the created fMeshBody""" nodeCoordinates = self.trimesh.vertices.flatten().tolist() nodeIndices = self.trimesh.faces.flatten().tolist() normalVectors = self.trimesh.vertex_normals.flatten().tolist() meshBody = comp.meshBodies.addByTriangleMeshData(nodeCoordinates, nodeIndices, normalVectors, nodeIndices) return meshBody def deleteMe(self): """sets the trimesh-value to None""" self.trimesh = None

So you can add this to your code:

# if you added the class as separate file to your folder from . import MyTrimesh as tri #root = adsk.core.Application.get().activeProduct.rootComponent mesh0 = ModelStl[0] # or any other body trimesh = tri.MyTrimesh() # creates Instance trimesh.create_from_fMesh(mesh0) # add meshbody to trimesh trimesh.transform(rotateModel) # move/rotate trimesh trimesh.add_to_component(root) # add rotated meshbody to root.meshBodies del trimesh

I hope this works for you, I´m using this class and it works fine for me. The only issue is, the Meshbody will added to the root.meshBodies, no matter what component you put in to the add_to_component-function.

Re: How do I move / rotate the mesh?

Anonymous — Fri, 11 Dec 2020 08:12:32 GMT

I made a misstake in the transform-function

instead of

def transform(self, matrix:adsk.core.Matrix3D): """executes a transformation on the trimeshBody""" self.trimesh.apply_transform(np.reshape(matrix,(-1,3)))

it should be

def transform(self, matrix:adsk.core.Matrix3D): """executes a transformation on the trimeshBody""" self.trimesh.apply_transform(np.reshape(matrix.asArray(),(-1,4)))

Re: How do I move / rotate the mesh?

shutov441-vuz — Fri, 11 Dec 2020 21:08:58 GMT

Hi @Anonymous, thank you for your solution. I solved this problem. All I needed to do was move and rotate the model. I did it like this.

def move_mesh_model(vector3D, mesh_item): design.designType = adsk.fusion.DesignTypes.DirectDesignType temp_mesh_models.add(mesh_models.item(mesh_item)) transform = adsk.core.Matrix3D.create() transform.translation = vector3D moveFeats = root.features.moveFeatures moveFeatureInput = moveFeats.createInput(temp_mesh_models, transform) moveFeats.add(moveFeatureInput) temp_mesh_models.clear()

All you had to do was switch the design mode.

design.designType = adsk.fusion.DesignTypes.DirectDesignTyp