Celestia/Celx Scripting/CELX Lua Methods/CEL command chase

chase chase { } Tells Celestia to set the active Coordinate System to chase, which chases the currently selected object through space. The command has no arguments. CELX equivalent-1: Based on the observer:setframe() method. Find the target object with name <string> to be chased and store in "objectname". objectname = celestia:find( <string> ) Create new frame of reference to chase with "objectname" as reference object and store in "frame". frame = celestia:newframe("chase", objectname) Get observer instance of the active view and set the coordinate system of the frame of reference to "frame". obs = celestia:getobserver() obs:setframe(frame) Summarized: objectname = celestia:find( <string> ) frame = celestia:newframe("chase", objectname) obs = celestia:getobserver() obs:setframe(frame) CELX equivalent-2: Based on the observer:chase() method. Find the target object with name <string> to be chased and store in "objectname". objectname = celestia:find( <string> ) Get observer instance of the active view and activate chase-mode on "objectname".Chase-mode is the same as setting the frame of reference to chase with objectname as reference object. obs = celestia:getobserver() obs:chase(objectname) Summarized: objectname = celestia:find( <string> ) obs = celestia:getobserver() obs:chase(objectname) Example: The following example selects the Moon, sets the Coordinate System to chase, and then goes to the Moon: CEL: select { object "Sol/Earth/Moon" } chase { } goto { time 2 } wait { duration 2 } CELX-1 with observer:setframe() method: moon = celestia:find("Sol/Earth/Moon") celestia:select(moon) frame = celestia:newframe("chase", moon) obs = celestia:getobserver() obs:setframe(frame) obs:goto(moon, 2.0) wait(2.0) CELX-2 with observer:chase() method: moon = celestia:find("Sol/Earth/Moon") celestia:select(moon) obs = celestia:getobserver() obs:chase(moon) obs:goto(moon, 2.0) wait(2.0) Back to CEL command index