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Fix wrong placement of objects children when saving to 3MF

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We now ignore the auto-centering of meshes for children objects, because it messes up with their relative position with their parent. Only the top-level objects needs to be centered, the children will follow.

CURA-11902
This commit is contained in:
Erwan MATHIEU 2024-05-14 14:54:00 +02:00
parent 22c17c68ac
commit b75f168c55
1 changed files with 20 additions and 13 deletions
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17
plugins/3MFWriter/ThreeMFWriter.py
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@ -96,7 +96,8 @@ class ThreeMFWriter(MeshWriter):
@staticmethod
def _convertUMNodeToSavitarNode(um_node,
transformation = Matrix(),
exported_settings: Optional[Dict[str, Set[str]]] = None):
exported_settings: Optional[Dict[str, Set[str]]] = None,
center_mesh = False):
"""Convenience function that converts an Uranium SceneNode object to a SavitarSceneNode
:returns: Uranium Scene node.
@ -111,16 +112,21 @@ class ThreeMFWriter(MeshWriter):
savitar_node = Savitar.SceneNode()
savitar_node.setName(um_node.getName())
node_matrix = Matrix()
node_matrix = um_node.getLocalTransformation()
mesh_data = um_node.getMeshData()
if center_mesh:
node_matrix = Matrix()
# compensate for original center position, if object(s) is/are not around its zero position
if mesh_data is not None:
extents = mesh_data.getExtents()
if extents is not None:
# We use a different coordinate space while writing, so flip Z and Y
center_vector = Vector(extents.center.x, extents.center.z, extents.center.y)
center_vector = Vector(extents.center.x, extents.center.y, extents.center.z)
node_matrix.setByTranslation(center_vector)
node_matrix.multiply(um_node.getLocalTransformation())
else:
node_matrix = um_node.getLocalTransformation()
matrix_string = ThreeMFWriter._convertMatrixToString(node_matrix.preMultiply(transformation))
@ -283,7 +289,8 @@ class ThreeMFWriter(MeshWriter):
for root_child in node.getChildren():
savitar_node = ThreeMFWriter._convertUMNodeToSavitarNode(root_child,
transformation_matrix,
exported_model_settings)
exported_model_settings,
center_mesh = True)
if savitar_node:
savitar_scene.addSceneNode(savitar_node)
else:
@ -442,7 +449,7 @@ class ThreeMFWriter(MeshWriter):
def sceneNodesToString(scene_nodes: [SceneNode]) -> str:
savitar_scene = Savitar.Scene()
for scene_node in scene_nodes:
savitar_node = ThreeMFWriter._convertUMNodeToSavitarNode(scene_node)
savitar_node = ThreeMFWriter._convertUMNodeToSavitarNode(scene_node, center_mesh = True)
savitar_scene.addSceneNode(savitar_node)
parser = Savitar.ThreeMFParser()
scene_string = parser.sceneToString(savitar_scene)