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  to be followed and store in “objectname”.

objectname = celestia:find(  )


 * 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(  ) 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  to be followed and store in "objectname".

objectname = celestia:find(  )


 * 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(  ) 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)

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