1.167.2 Send methods

sdl_mesh ->initialise:

Create an empty mesh.

sdl_mesh ->append: position=point, texture=[point], colour=[colour]

Append a vertex at position, in the coordinates of the window. texture is its position in the texture, in pixels (default point(0,0)), and colour its colour (default opaque white). The index of the new vertex is the old sdl_mesh<-count.

sdl_mesh ->triangle: int, int, int

Append a triangle between the vertices with these indices. Raises an error if there is no such vertex. If a mesh has no triangles, each three consecutive vertices make a triangle.

sdl_mesh ->clear:

Remove all vertices and triangles.

sdl_mesh ->changed:

Show the windows of the layers again. This is done by the methods that change the mesh.