[Bf-python] blender python script error

[Brecht Van Lommel]

For the specific question you are asking, this is probably the page to read:
http://www.blender.org/documentation/blender_python_api_2_69_1/info_quickstart.html

bpy.context.scene is the active scene, while bpy.data.scenes['Scene']
is the scene named 'Scene'. They can be the same, it depends which
scene the user has selected.

On Thu, Nov 7, 2013 at 6:53 PM, Cook, Rich <cook47 at llnl.gov> wrote:
> Thanks, that's helpful.
> I have been having an issue with the documentation.  It's very hard to
> explore.  There doesn't appear to be an API reference that actually
> enumerates and describes all the various functions.  For example,
> http://www.blender.org/documentation/blender_python_api_2_69_1/info_api_reference.html
> seems like a good introduction, but I am having trouble understanding the
> relationship and definition of the various concepts, such as contexts,
> objects, etc.
>
> For example, what is the difference between bpy.context.scene and
> bpy.data.scenes['Scene'] ?
> Are they pointing to the same object?  I don't even know where to look for
> the answer!  Do I need to just practice and keep asking for specifics until
> it all dawns on me, or is there a really good book or reference to all this?
>
> My goal in the end is to do this, all in python:
>
> Set up camera, lights, and a camera path.  Import a mesh to view, and
> animate the scene, swapping out meshes at regular intervals to let the mesh
> evolve while zooming in, adjusting lights and properties, etc., to capture
> the best appearance.
>
> Thanks!
>
> On Nov 7, 2013, at 9:01 AM, Bassam Kurdali <bassam at urchn.org> wrote:
>
> Try
>
> bpy.context.scene.frame_set()
>
> Operators rely on context so it can get hard to satisfy them (you could also
> try making a timeline window visible). You can override context by paying an
> optional dict to the operator but I've found this tricky to get right in
> practice.
> Oh, and welcome to this blender thing,
> Bassam
>
> "Cook, Rich" <cook47 at llnl.gov> wrote:
>
> Hi, I'm new to this here blender thingie.  I was trying some code out to
> import a few meshes from a science run, and am getting an error I cannot get
> past.  I was going to import the timesteps as separate meshes, then set
> keyframes on visibility for each mesh at different timesteps in order to
> "animate" them.  Per
> http://blenderscripting.blogspot.de/2011/07/scripted-keyframing-of-hide-hide-render.html
>
> I am getting the following error:
>
>>>> bpy.ops.anim.change_frame(frame = 5)
> Traceback (most recent call last):
>   File "<blender_console>", line 1, in <module>
>   File
> "/Volumes/MacProHD/cook47-stuff/Programs/graphics/Blender/blender.app/Contents/MacOS/2.68/scripts/modules/bpy/ops.py",
> line 188, in __call__
>     ret = op_call(self.idname_py(), None, kw)
> RuntimeError: Operator bpy.ops.anim.change_frame.poll() Expected an
> timeline/animation area to be active
>
> I do have a timeline visible in the GUI.  I'm not sure what blender is
> trying to tell me.
>
> I'm probably going to change approaches and just load one mesh at a time,
> set up the scene, render, and move to the next, etc.  However, my technical
> curiosity has the best of me here.  I'd like to understand why I cannot set
> a timestep here.
>
> Thanks!
>
> <span class="Apple-style-span" style="border-collapse: separate;
> -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing:
> 0px; color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; font
>
>
> --
> ✐Richard Cook
> ✇ Lawrence Livermore National Laboratory
> Bldg-453 Rm-4024, Mail Stop L-557
> 7000 East Avenue,  Livermore, CA, 94550, USA
> ☎ (office) (925) 423-9605
> ☎ (fax) (925) 423-6961
> ---
> Information Management & Graphics Grp., Services & Development Div.,
> Integrated Computing & Communications Dept.
> (opinions expressed herein are mine and not those of LLNL)
>
>
>
>
> _______________________________________________
> Bf-python mailing list
> Bf-python at blender.org
> http://lists.blender.org/mailman/listinfo/bf-python
>