r - Plotting surfaces with contour map in 3D over triangles - Stack Overflow

The example code here for rgl does almost what I want. However my (x,y) are not in a rectangle but in a triangle that is half of the rectangle (x=0..1, y=0..1 and z is missing if x+y>1). My input

r - Plotting surfaces with contour map in 3D over triangles - Stack Overflow

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Performance evaluation of resin wafer electrodeionization for cooling tower blowdown water reclamation, Sustainable Environment Research

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How to interpolate data between sparse points to make a contour plot in R & plotly - Stack Overflow

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numpy - Plot a triangle contour/surface matplotlib python: tricontourf/meshgrid - Stack Overflow

Stack-Overflow-Tags-Communities/dataset/WIKI_sof at master · imansaleh16/ Stack-Overflow-Tags-Communities · GitHub

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r - Adding Contour Lines to 3D Plots - Stack Overflow

numpy - Plot a triangle contour/surface matplotlib python: tricontourf/meshgrid - Stack Overflow

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Chapter: Histograms