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A ternary diagram plots compositions made of exactly three components that always add up to 100% — each side of the triangle represents one component's share, and any point inside represents a specific mixture of all three. It's the standard chart for three-variable composition data: soil classification by sand/silt/clay content, rock and mineral classification in geology, phase diagrams in metallurgy and materials science, and mixture design in chemistry.
Sheetful generates the triangular grid with gridlines parallel to all three sides, at a division size that scales automatically with your spacing setting — finer spacing gives more divisions per side for reading precise values, coarser spacing gives a cleaner grid for rougher sketching. Choose US Letter or A4 and adjust line weight so the triangle's outer edges stay visually distinct from the internal grid.
Plotting any composition made of exactly three parts that sum to 100% — common in geology (rock/soil classification), metallurgy (phase diagrams), and chemistry (three-component mixtures).
Each of the triangle's three sides corresponds to one component. A point's distance from each side (measured parallel to the opposite side) gives that component's percentage — the three percentages for any point always add up to 100%.
It scales with the spacing setting, from 4 up to 25 divisions per side — smaller spacing gives more, finer divisions for precise reading.
Yes — the generator produces the grid only; write your component labels (e.g. sand/silt/clay) along the appropriate edges by hand or in whatever software you annotate the PDF with.