twn_draw: draw_camera_unproject()

include/twn_draw.h

@@ -100,6 +100,20 @@ TWN_API void draw_camera(Vec3 position,         /* optional, default: (0, 0, 0)
                          float zoom,            /* optional, default: 1 */
                          float draw_distance);  /* optional, default: 100 */
 
+/* find position and looking direction of a 2d point into 3d space */
+/* make sure it's called with matching parameters to last draw_camera(), if you need them to match */
+typedef struct DrawCameraUnprojectResult {
+    Vec3 position;
+    Vec3 direction;
+} DrawCameraUnprojectResult;
+TWN_API DrawCameraUnprojectResult draw_camera_unproject(Vec2 point,
+                                                        Vec3 position,
+                                                        Vec3 direction,
+                                                        Vec3 up,
+                                                        float fov,
+                                                        float zoom,
+                                                        float draw_distance);
+
 /* same as draw_camera(), but with first person controller in mind */
 /* direction and up vectors are inferred from roll, pitch and yaw parameters (in radians) */
 /* return value is direction and up vectors, so that you can use them in logic (such as controllers) */