ListDensityPlot3D with thick points or BarLegend for Graphics3D

Question

I have a small number of points in 3D space. Each point has an associated weight (real number). For each point, I want to plot a [visible point] whose color is a function of the weight value.

It seems like ListDensityPlot3D would work for this, but I just get a blank space and I think this is because the points are spaced so far apart and I cannot find an PointSize option for ListDensityPlot3D.

My closest work around is to use Graphics3D and Point, but I cannot use a BarLegend because "BarLegend is not a Graphics3D primitive or directive".

I have pasted my workaround and my attempt at using ListDensityPlot3D.

x = {0, -0.1, 0};
y = {0, 0.8, 0};
z = {0, -0.5, 1};
T = {90.9, 57.7, 0};

Graphics3D[{
  Table[
   {Hue[T[[i]]], PointSize[0.03],
    Point[
     {x[[i]], y[[i]], z[[i]]}
     ]},
   {i, 1, 3}],
  Opacity[0.05], Cuboid[{-1, -1, -1}, {1, 1, 1}]},
 Axes -> True, AspectRatio -> 1
 ]

ListDensityPlot3D[
 Table[{x[[i]], y[[i]], z[[i]], T[[i]]}, {i, 1, 3}]
 ]

Answer 1

BubbleChart3D[Thread[{x, y, z, 1}], 
 BubbleSizes -> Medium, 
 Boxed -> True,
 ChartStyle -> (ColorData["Rainbow"] /@ Rescale[T]), 
 ChartLegends -> SwatchLegend[T, LegendMarkers -> "Bubble"],
 FaceGrids -> {}]

Answer 2

ListPointPlot3D[
 List /@ Transpose[{x, y, z}],
 PlotStyle -> {Red, Blue, Green},
 PlotLegends -> T
 ]