sg_gl_shape - OpenGL scene graph shapes

`require'sg_gl_shape'`

Extends sg_gl to render shape objects.

Shape objects

A shape is a type of OpenGL scene graph object that describes a 3D object in a state-machine kind of language. Internally, the shape description is converted into a mesh object which is then rendered.

<shape_object> = {
   type = 'shape',
   <mode> |
   'color', r, g, b, a |
}

<mode> = see sg_gl_mesh for available modes.