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  4. Applying a transformation to all the entities of a group

Applying a transformation to all the entities of a group

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pythontransformationapi
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  • SylvainS Offline
    SylvainS Offline
    Sylvain
    ZMT
    wrote on last edited by Sylvain
    #1

    [EDIT]: in Sim4Life 4.0 (and above), the steps below are no longer necessary. The ApplyTransform() function can be directly used on an EntityGroup object:

    # Select "Duke" entity group
    duke_group = model.AllEntities()["Duke"]
    # apply transformation to each entity of the group
    x = 10.0
    y = 5.0
    z = 12.0
    duke_group.ApplyTransform( Translation(Vec3(x,y,z)) )
    

    [ORIGINAL POST]
    To apply a given transformation on a whole group of entities with Python, you have to use the ApplyTransform() function on each element of the EntityGroup object. What you can do is write a recursive function that does exactly that. Here is an example of such function:

    def ApplyTransformRecursively(entity_group, transformation):
       if isinstance(entity_group, core.EntityGroup):
          for entity in entity_group.Entities:
             ApplyTransformRecursively(entity, transformation)
       else:
          entity_group.ApplyTransform(transformation)
    

    You can use it like this:

    # Select "Duke" entity group
    duke_group = model.AllEntities()["Duke"]
    # apply transformation to each entity of the group
    x = 10.0
    y = 5.0
    z = 12.0
    ApplyTransformRecursively(duke_group, Translation(Vec3(x,y,z)))
    
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