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Micheus,
I haven't watched the video yet.

With the code change mentioned in my first post the first object is transparent in Shift+Tab and in Shift+Tab Tab.

In work mode the transparency isn't as obvious in the first object created but it is there. You can see other objects through the first object but it is just less transparent and you cannot see the axis or grid through it.

oort

One would think it would be easier to figure this out...

I first looked at the following part of wings_render.erl. Since it referred to object_1 and object_2 but I couldn't find anything to make it work.
Starting at Line 124

I will be busy for the rest of the day.

oort

render_objects(Mode, SceneLights) ->
    Dls = wings_dl:display_lists(),
    case wings_wm:get_prop(workmode) of
    false ->
        render_smooth_objects(Dls, Mode, false, SceneLights),
        render_smooth_objects(Dls, Mode, true, SceneLights);
    true ->
        render_work_objects(Dls, Mode, SceneLights)
    end.

render_smooth_objects([D|Dls], Mode, RenderTrans, SceneLights) ->
    render_object(D, Mode, false, RenderTrans, SceneLights),
    render_smooth_objects(Dls, Mode, RenderTrans, SceneLights);
render_smooth_objects([], _, _, _) -> ok.

render_work_objects([D|Dls], Mode, SceneLights) ->
    render_object(D, Mode, true, false, SceneLights),
    render_work_objects(Dls, Mode, SceneLights);
render_work_objects([], _, _) -> ok.

render_object(#dlo{drag={matrix,_,_,Matrix}}=D, Mode, Work, RT, SceneLights) ->
    gl:pushMatrix(),
    gl:multMatrixf(Matrix),
    render_object_1(D, Mode, Work, RT, SceneLights),
    gl:popMatrix();
render_object(D, Mode, Work, RT, SceneLights) ->
    render_object_1(D, Mode, Work, RT, SceneLights).

render_object_1(#dlo{mirror=none}=D, Mode, Work, RenderTrans, SceneLights) ->
    render_object_2(D, Mode, Work, RenderTrans, SceneLights);
render_object_1(#dlo{mirror=Matrix}=D, Mode, Work, RenderTrans, SceneLights) ->
    render_object_2(D, Mode, Work, RenderTrans, SceneLights),
    gl:frontFace(?GL_CW),
    gl:pushMatrix(),
    gl:multMatrixf(Matrix),
    render_object_2(D, Mode, Work, RenderTrans, SceneLights),
    gl:popMatrix(),
    gl:frontFace(?GL_CCW).

render_object_2(#dlo{src_we=We}=D, _, _, false, _) when ?IS_LIGHT(We) ->
    wings_light:render(D);
render_object_2(#dlo{src_we=We}, _, _, true, _) when ?IS_LIGHT(We) ->
    ok;
render_object_2(D, Mode, true, _, SceneLights) ->
    render_plain(D, Mode, SceneLights);
render_object_2(#dlo{transparent=true}=D, _, false, false, SceneLights) ->
    gl:disable(?GL_CULL_FACE),
    render_smooth(D, false, SceneLights),
    gl:enable(?GL_CULL_FACE);
render_object_2(#dlo{transparent=true}=D, _, false, true, SceneLights) ->
    render_smooth(D, true, SceneLights);
render_object_2(#dlo{transparent=false}=D, _, false, RenderTrans, SceneLights) ->
    render_smooth(D, RenderTrans, SceneLights).

Micheus,
Great find! Yes that fixes the bug for objects in Shift+Tab Tab. Can you find the fix for workmode as well?

It took me a bit longer to verify since I used the code just as listed above. I forgot I cannot use CONSTANT_ALPHA or blendColor on my system...

Thanks,
oort