how to add location constraints for an object in blender?

Question

I want to make it so that my program will stop running and print object is out of bounds if an object goes say into the negative z part of the plane in blender. the objects name is Cube.031. I will sudo code what I want to do I just am not sure about sure how to do the syntax for it.

 if(Cube.031.zLocation < 0)
        print(object is out of bounds)
        end

Answer 1

If you know some programming, learning python won't take long.

For the blender specific info, almost everything is accessed through the bpy module, the API reference is online .

You can refer to an object by name in bpy.data.objects[] . There are also other lists available, like bpy.context.selected_objects[] and bpy.context.visible_objects[] .

An objects location is an array of three values (x,y,z), you can either access the z location as location.z or location[2] .

import bpy

obj = bpy.data.objects['Cube.031']

if obj.location.z < 0:
    print('object is out of bounds')

If you wanted to go through all selected objects

for obj in bpy.context.selected_objects:
    if obj.location.z < 0:
        print('object {} is out of bounds'.format(obj.name))

Note that v2.80 is due for release soon and has some changes to the API , if you are just starting with blender you may want to start with 2.80. You will also find blender.stackexchange a better place to ask for blender specific help.