[Feature] Point cloud plotting

[WorstCodeWay]

Feature description

This is a truly great work; I’ve been looking for it for several days. implot3d undoubtedly supports plotting many 3D elements, including meshes, surfaces, and so on, but it doesn’t support point clouds, right?

I used to use CloudCompare frequently, and its functionality is excellent, but I always used it standalone and never integrated it into my own software, because that was a bit difficult for me. Until I encountered Dear ImGuiand implot3d, it seemed that it might actually be possible, right?

[brenocq]

Hi @WorstCodeWay. While it is possible to plot point clouds with ImPlot3D using the PlotScatter method, it is not very performant. I would suggest using the ImPlot3DMarker_Square marker and downsampling the point cloud before plotting. Currently, there is no build-in tool to edit point clouds. I recommend taking a look into the DemoCustomPerPointStyle() in implot3d_demo.cpp to color each point cloud point with a different color.

There's #159 and #158 tools in the roadmap, let me know if there's another tool you would need to edit the point clouds!