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Names & Objects
Aug. 16th, 2017
info License: CC-BY
Sybren A. Stüvel
Publisher
In this video we see how, in Python, names refer to objects. In this context, an "object" refers to a thing in Python, and not necessarily a Blender object in 3D space. Knowing how names refer to things in memory is an essential part of scripting (and not wearing out your fingers from all the typing).
- Everything is an Object (in Python)
- Names refer to Objects
- Using Blender's Context
- Digging through names & objects by dotting
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14 comments
Wow Sybren! I can't thank you enough! You have special talent for explaining this kind of stuff! I'm a recovering "script avoiding addict" I'm almost sure this course will cure me :D
I disagree that monkey is definitely not named 'Steve'. I think it's 'Suzanne' ....
Hi thanks you offer script tutoriall. it is really useful to learn blender specific operations. then I have one question about context. in blender manuall, it say "all context values are readonly, but may be modified through the data api or by running operators"
but when I try to re-name, by bpy.context.active_object.name = "newmonkey" it could work in blender console. is it exceptional case? or if I can only change location.x etc by context?
@fun2tax: I did it in 2 lines.
a = bpy.context.active_object
a.name = "newmonkey"
@fun2tax: That remark only relates to the names in
bpy.contextthemselves. For example, you cannot dobpy.context.active_object = some_obto makesome_obthe active object. Instead, you have to assign tobpy.context.scene.objects.active, since every scene has an active object.You can still change the name of an object by assigning a value to its
nameattribute; the fact that that object happens to also be accessible throughbpy.context.active_objectdoes not all of a sudden make itsnameorlocationattributes read-only.@Stefan59: it doesn't matter whether you do something in one or two lines. In your case,
ais just another name for that particular object. It's the object itself that determines what you can do with it, not the name you assign to it.@sybren: thanks now I seems understand , bpy.context read only meaning better. and Yes stephan, it actually work for me too. then I though it can be changed by context too.
Very new to Blender scripting. TAB is your Python auto-complete friend. Others new to Blender's way may benefit from knowing this.
The autoplay just repeats the first video over and over again. it doesn't go to the next one
@raj: never has
Hi, thanks for the tutorial!
If I say:
steve = bpy.ops.mesh.primitive_circle_add()
steve will become the string {'FINISHED'}, which might be handy for error handling, but I expected it to be a reference to the created object.
If I want to immediately do something with steve, I can refer to the active object, but what if I want to just remember that specific object for later modifications, I could use these lines:
bpy.ops.mesh.primitive_circle_add()
steve = bpy.context.selected_objects[0]
However, I'd like to know if I could write that in just one line.
@Roland Gsell: the returned value of an operator will always be of this form, so you can't write what you want in one line. I would also suggest using
steve = bpy.context.active_objectinstead of usingselected_objects[0]. If later the active object changes,stevewill still point to the circle object you added.@Dr. Sybren: Thanks! The strange thing is that python autocompleted activ... to active_objects - so I thought there's no single object to work with.
Maybe that's sort of a zsh autocompletion and I'm more the bash-guy ;-) I can't try it out at the moment, my Blender is rendering some stuff...
I love the new version by the way. 100 samples with denoise looks much better than 500 with 2.78..
Transcript please. (no subtitle)
Very helpful videos but It would be really better if we had at least English subtitles!!! In a few parts I can't really understand what Mr. Sybren says... Subtitles would be really useful!!!