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

follow follow { } This command tells Celestia to set the Coordinate System to ecliptical, and to follow the currently selected object. The command has no arguments. CELX equivalent-1: Based on the observer:setframe() method. Find the target object with name <string> to be followed and store in “objectname”. objectname = celestia:find( <string> ) Create new frame of reference to ecliptic with "objectname" as reference object and store in "frame". frame = celestia:newframe("ecliptic", 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("ecliptic", objectname) obs = celestia:getobserver() obs:setframe(frame) CELX equivalent-2: Based on the observer:follow() method. Find the target object with name <string> to be followed and store in "objectname". objectname = celestia:find( <string> ) Get observer instance of the active view and activate follow-mode on "objectname".Follow-mode is the same as setting the frame of reference to ecliptic with "objectname" as reference object. obs = celestia:getobserver() obs:follow(objectname) Summarized: objectname = celestia:find( <string> ) obs = celestia:getobserver() obs:follow(objectname) Example:This example selects Mars, sets the Coordinate System to ecliptical (follow), and then travels to Mars. CEL: select { object "Sol/Mars" } follow { } goto { time 2 } wait { duration 2 } CELX-1 with observer:setframe() method: mars = celestia:find("Sol/Mars") celestia:select(mars) frame = celestia:newframe("ecliptic", mars) obs = celestia:getobserver() obs:setframe(frame) obs:goto(mars, 2.0) wait(2.0) CELX-2 with observer:follow() method: mars = celestia:find("Sol/Mars") celestia:select(mars) obs = celestia:getobserver() obs:follow(mars) obs:goto(mars, 2.0) wait(2.0) Back to CEL command index