Added Scene downcasting to Object

[melix99]

This is needed to manage the scene as an object, otherwise it can do nothing.

[codecov-io]

Codecov Report

Merging #8 into master will decrease coverage by 0.12%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
- Coverage   90.96%   90.84%   -0.13%     
==========================================
  Files          39       39              
  Lines        4053     4053              
==========================================
- Hits         3687     3682       -5     
- Misses        366      371       +5

Impacted Files	Coverage Δ
src/python/magnum/scenegraph.trs.cpp	100% <100%> (ø)	:arrow_up:
src/python/magnum/scenegraph.matrix.cpp	100% <100%> (ø)	:arrow_up:
src/python/magnum/scenegraph.h	68.26% <0%> (-0.97%)	:arrow_down:
src/python/magnum/gl.cpp	94.9% <0%> (-0.66%)	:arrow_down:

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[mosra]

Err, sorry for the late reply again (I have too many repos and too many notifications :sweat_smile:).

It's deliberately done the way it is now -- the scene should not have any transformations applied or features attached, it's just root object, holding everything else. That's the same on the C++ side -- the scene will complain (or ... it should) if you try to set its transformation or attach features.

If you need something at the root, add a direct child Object.

(Vaguely relevant is that I don't provide any iterator access for object's children or features in the Python bindings -- that need to be added.)

[melix99]

Oh you're right, for some reason I thought that it applies transformations, maybe because in c++ using setTranslation()/etc don't give errors, but it does in python.

(Vaguely relevant is that I don't provide any iterator access for object's children or features in the Python bindings -- that need to be added.)

Ok, maybe I can take a look to that when I have time.

[mosra]

don't give errors

It'll do nothing at runtime ... which isn't good, it should be asserting. Unfortunately with the current design it's hard to make it a compile-time error.

Maybe I can take a look to that when I have time.

It's a boring and time-consuming task of writing an iterator class for LinkedList and exposing it to Python, which is why I didn't do it yet :D