graphene:point3d-to-vec3 (p v)

p -- a graphene:point3d-t instance
v -- a graphene:vec3-t instance

The graphene:vec3-t instance for the coordinates of the point.

Stores the coordinates of the given point into a vector.

(graphene:with-point3d (p 1.0 2.0 3.0)
  (graphene:with-vec3 (v)
    (graphene:vec3-to-float (graphene:point3d-to-vec3 p v))))
=> (1.0 2.0 3.0)