do not connect transformations in different spaces

src/camera/camera2d.jl

@@ -11,8 +11,8 @@ end
 """
     cam2d!(scene::SceneLike, kwargs...)
 
-Creates a 2D camera for the given `scene`. The camera implements zooming by 
-scrolling and translation using mouse drag. It also implements rectangle 
+Creates a 2D camera for the given `scene`. The camera implements zooming by
+scrolling and translation using mouse drag. It also implements rectangle
 selections.
 
 ## Keyword Arguments
@@ -46,6 +46,7 @@ function cam2d!(scene::SceneLike; kw_args...)
     cam
 end
 
+get_space(::Camera2D) = :data
 wscale(screenrect, viewrect) = widths(viewrect) ./ widths(screenrect)
 
 
@@ -310,13 +311,15 @@ function add_restriction!(cam, window, rarea::Rect2, minwidths::Vec)
 end
 
 struct PixelCamera <: AbstractCamera end
+get_space(::PixelCamera) = :pixel
 
 
 struct UpdatePixelCam
     camera::Camera
     near::Float32
     far::Float32
 end
+get_space(::UpdatePixelCam) = :pixel
 
 function (cam::UpdatePixelCam)(window_size)
     w, h = Float32.(widths(window_size))
@@ -327,7 +330,7 @@ end
 """
     campixel!(scene; nearclip=-1000f0, farclip=1000f0)
 
-Creates a pixel camera for the given `scene`. This means that the positional 
+Creates a pixel camera for the given `scene`. This means that the positional
 data of a plot will be interpreted in pixel units. This camera does not feature
 controls.
 """
@@ -345,11 +348,12 @@ function campixel!(scene::Scene; nearclip=-10_000f0, farclip=10_000f0)
 end
 
 struct RelativeCamera <: AbstractCamera end
+get_space(::RelativeCamera) = :relative
 
 """
     cam_relative!(scene)
 
-Creates a camera for the given `scene` which maps the scene area to a 0..1 by 
+Creates a camera for the given `scene` which maps the scene area to a 0..1 by
 0..1 range. This camera does not feature controls.
 """
 function cam_relative!(scene::Scene; nearclip=-10_000f0, farclip=10_000f0)

src/camera/camera3d.jl

@@ -1,5 +1,7 @@
 abstract type AbstractCamera3D <: AbstractCamera end
 
+get_space(::AbstractCamera3D) = :data
+
 struct Camera3D <: AbstractCamera3D
     # User settings
     settings::Attributes

src/camera/old_camera3d.jl

@@ -53,6 +53,8 @@ function old_cam3d_cad!(scene::Scene; kw_args...)
     cam
 end
 
+get_space(::OldCamera3D) = :data
+
 """
     old_cam3d_turntable!(scene; kw_args...)
 

src/camera/projection_math.jl

@@ -344,6 +344,12 @@ function clip_to_space(cam::Camera, space::Symbol)
     end
 end
 
+get_space(scene::Scene) = get_space(cameracontrols(scene))
+# TODO: Should we default to something invalid?
+get_space(::AbstractCamera) = :data
+# TODO: Should this be less specialized? ScenePlot? AbstractPlot?
+get_space(plot::Combined) = to_value(get(plot, :space, :data))
+
 function project(cam::Camera, input_space::Symbol, output_space::Symbol, pos)
     input_space === output_space && return to_ndim(Point3f, pos, 0)
     clip_from_input = space_to_clip(cam, input_space)

src/interfaces.jl

@@ -228,7 +228,9 @@ function connect_plot!(parent::SceneLike, plot::Combined{F}) where {F}
             transform!(t, t_user)
             plot.transformation = t
         end
-        connect!(transformation(parent), transformation(plot))
+        if get_space(parent) === get_space(plot)
+            connect!(transformation(parent), transformation(plot))
+        end
     end
     plot.model = transformationmatrix(plot)
     convert_arguments!(plot)