push some vertices from an array. that's much better for performing than using s3d_push_vertex() if you have a lot of vertices (and that's probably the usual case).
float vertices[] = { 0.0, 0.0, 0.0,
1.0, 2.0, 3,0,
3.0, 2.0, 1.0};
s3d_push_vertices(object, vertices, 3); /* pushing 3 vertices */