A triangle uses one polygon (a triangular polygon).
A square (or rectangle) uses two triangular polygons.
A triangle has 3 UV coordinates to define how the texture is mapped, whereas a rectangle has 4 UV coords instead.
Hope this helps.
A square (or rectangle) uses two triangular polygons.
A triangle has 3 UV coordinates to define how the texture is mapped, whereas a rectangle has 4 UV coords instead.
Hope this helps.