add orbit command

src/commands.rs

@@ -227,6 +227,20 @@ pub fn load_defs(
                     }
                 }
             }
+            ["orbit", radius_str, phase_str] => {
+                if let (Ok(r), Ok(phase)) = (radius_str.parse::<f64>(), phase_str.parse::<f64>()) {
+                    let phase_deg = phase * PI64 * 2.0;
+                    state.pos = DVec3::new(
+                        state.pos.x + r * phase_deg.cos(),
+                        state.pos.y,
+                        state.pos.z + r * phase_deg.sin(),
+                    );
+                }
+                else {
+                    error!("Can't parse float: {line}");
+                    continue;
+                }
+            }
             ["sphere", "yes"] => {
                 state.is_sphere = true;
             }