Different ways vertices in a mesh can be connected together and filled in with pixels.

points Each vertex is rendered as a single point. The size of the point can be controlled using the pointSize shader flag, or by writing to the PointSize variable in shaders. The maximum point size is given by the pointSize limit from
lines Pairs of vertices are connected with line segments. To draw a single line through all of the vertices, an index buffer can be used to repeat vertices. It is not currently possible to change the width of the lines, although cylinders or capsules can be used as an alternative.
triangles Every 3 vertices form a triangle, which is filled in with pixels (unless Pass:setWireframe is used). This mode is the most commonly used.

See also