BUG? angle after simple math asin is 1.#QO in Godot 3.2.3 official from steam

SunnyDrake

I have tryed different approaches to rotate Spatial/Meshinstance with look_at and different tricks around with no success So i checked old school approach manually calculate angle and set it via only one working solution rotation_degrees.y For it i needed x and z (as XY).. for some luck my target is almost in 0,0,0 position of scene and need to rotate to player but after some debugging i found that asin returns not correct values.... and should be 177.95 as shown below

dotted

internally godot uses radians not degrees, as these are the units of measure for the underlying C++ trig libraries.

The inspector works with degrees for us humans.

there are built in functions to convert between the units for angles: deg2rad and rad2deg

https://docs.godotengine.org/en/stable/classes/class_@gdscript.html

SunnyDrake

Thanks for reply ,but why my mesh not rotating when i call enemy.look_at(player) i can see rotation changes in transform on object but in running process it's just ignored?

SunnyDrake

For all who have such problems (as me :)) - turned out look_at works in different than local coordinate system - world coordinates In godot its accessed by global_transform property .. However you may run in issue when object facing just back to you - in this case you can still rotate it . Code Dragon.look_at(Player.global_transform.origin,Vector3.UP) Dragon.rotate_object_local(Vector3(0,1,0), 3.14)

dotted

This is known behavior of look_at().

It pays to google it first:

https://godotengine.org/qa/23054/look_at-looks-exactly-at-the-opposite-direction

and still you where calling

asin(div)

and assigning it to rotation_degrees