91     PointFloat3 world;  in bowl_view_image_to_world()  local
105         world.z = config.wall_height - img_pos.y * z_step; // TODO world.z  in bowl_view_image_to_world()
107         float r2 = 1 - (world.z - config.center_z) * (world.z - config.center_z) / (c * c);  in bowl_view_image_to_world()
110             world.x = 0.0f;  in bowl_view_image_to_world()
111             world.y = -sqrt(r2 * b * b);  in bowl_view_image_to_world()
113             world.x = 0.0f;  in bowl_view_image_to_world()
114             world.y = sqrt(r2 * b * b);  in bowl_view_image_to_world()
116             world.x = sqrt(r2 * a * a * b * b / (b * b + a * a * tan(angle) * tan(angle)));  in bowl_view_image_to_world()
117             world.y = -world.x * tan(angle);  in bowl_view_image_to_world()
119             world.x = -sqrt(r2 * a * a * b * b / (b * b + a * a * tan(angle) * tan(angle)));  in bowl_view_image_to_world()
120             world.y = -world.x * tan(angle);  in bowl_view_image_to_world()
136             world.x = 0.0f;  in bowl_view_image_to_world()
137             world.y = -b;  in bowl_view_image_to_world()
139             world.x = 0.0f;  in bowl_view_image_to_world()
140             world.y = b;  in bowl_view_image_to_world()
142             world.x = a * b / sqrt(b * b + a * a * tan(angle) * tan(angle));  in bowl_view_image_to_world()
143             world.y = -world.x * tan(angle);  in bowl_view_image_to_world()
145             world.x = -a * b / sqrt(b * b + a * a * tan(angle) * tan(angle));  in bowl_view_image_to_world()
146             world.y = -world.x * tan(angle);  in bowl_view_image_to_world()
148         world.z = 0.0f;  in bowl_view_image_to_world()
151     return world;  in bowl_view_image_to_world()